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Healing of acute anterior cruciate ligament rupture on MRI and … – British Journal of Sports Medicine

Background

A common belief among researchers and clinicians is that a ruptured anterior cruciate ligament (ACL) has limited healing capacity. This belief has shaped current management strategies for ACL rupture. However, anatomical studies have demonstrated that the ACL has a rich vascular supply1 2 and histological studies describe ruptured ACLs passing though the typical phases of healing after injury, despite a slower rate of healing and reduced healing capacity compared with medial collateral ligament rupture.35 An absence of tissue bridging the gap between ligament remnants has been observed, which may inhibit healing of ACL rupture.6 The distance between the ACL origin to its insertion is shortest at 90135 of knee flexion.7 We have developed the novel Cross Bracing Protocol (CBP) that aims to reduce the gap distance between the ligament remnants by immobilising the knee at 90 of flexion for 4 weeks after acute ACL rupture in attempt to facilitate bridging of tissue and healing between the ruptured ACL remnants. After 4 weeks, knee range-of-motion is increased at weekly increments and the CBP is coupled with physiotherapist-supervised rehabilitation targeting lower limb neuromuscular control, muscle strengthening and power, and functional training to enable return-to-sport and recreational activities.

A 2021 systematic review identified only six studies that evaluated ACL healing on MRI after ACL rupture.8 Studies were of low methodological quality and five studies included 50 participants.8 More recently, an analysis of the KANON Trial observed MRI evidence of ACL healing at a 2-year follow-up in 30% of participants who were randomised to initial rehabilitation and optional delayed ACL reconstruction (ACLR).9 Those with MRI evidence of ACL healing reported better 2-year knee function and quality of life (QOL), compared with participants with no MRI evidence of ACL healing, and participants managed with early or delayed ACLR.9 Many ACL injured people experience poor long-term outcomes, including sport and activity limitations, persistent pain, an early onset of osteoarthritis and poor long-term QOL.1013 Considering the suboptimal outcomes with current management strategies, and the potential for ACL healing to result in favourable outcomes, new strategies to preserve and heal the native ACL should be explored. The objective of this study was to investigate MRI evidence of ACL healing, patient-reported outcomes and knee laxity in the first 80 individuals with acute ACL rupture managed non-surgically with the CBP.

This case series investigates outcomes from 80 consecutive patients with acute ACL rupture who were managed with the CBP. Data were collected in the course of clinical practice, and all participants provided informed consent for their data to be included in this study.

Eighty patients between the ages of 10 years and 58 years (mean (SD): 26 years (10 years)), who presented to a private sport and exercise medicine physician in Sydney, Australia (TC), with MRI confirmed acute ACL rupture between March 2016 and September 2021, were managed with the CBP (figure 1). Twelve out of 80 patients were residing outside of Sydney or impacted by COVID-19 restrictions and underwent virtual specialist consultations (TC), supplemented by in-person management and assessment from an experienced sports and exercise physician and physiotherapists trained in the CBP.

Participant flow chart. ACL, anterior cruciate ligament; ACLR, anterior cruciate ligament reconstruction; CBP, Cross Bracing Protocol; DVT, deep vein thrombosis; MCL, medial collateral ligament.

Patients of all ages, were considered eligible for the CBP if they presented within 1 month of acute ACL rupture, confirmed on MRI (ie, an ACL OsteoArthritis Score (ACLOAS) grade 3 representing full discontinuity of the ACL). To be considered for the CBP, patients needed to be functionally independent and capable of managing a period of knee immobilisation. Patients were considered ineligible if they had clinical or MRI evidence of structural concomitant injuries that necessitated surgical intervention (eg, an unstable bucket-handle meniscal tear) or a history of deep vein thrombosis (DVT) or pulmonary embolism. After the 10th participant, DVT screening was added to the eligibility criteria, whereby all patients underwent Doppler ultrasound to exclude DVT. The flow of participants through the study, including reasons for not offering the CBP and reasons for choosing ACLR (no participants chose rehabilitation alone), is presented in figure 1.

Patients were informed about treatment options: early ACLR, non-operative rehabilitation with optional delayed ACLR or trialling the CBP. Patients received information on the rationale and theoretical justification for the CBP, and they were aware that this was an experimental treatment with a chance of failure and possible need for ACLR in the future. The decision to trial the CBP was based on patient preference.

The CBP and accompanying rehabilitation protocol is described in online supplemental appendix 1. In patients presenting in the first week post-injury, the use of cryotherapy and anti-inflammatory medications was discouraged to minimise impairment of the acute inflammatory response.5 14 Paracetamol was prescribed as needed for pain. Fourteen patients who presented 7 days post-injury with minimal or no hemarthrosis/effusion underwent a platelet-rich plasma injection.

The injured knee was then secured at 90 flexion in a standard limited range-of-motion brace as early as convenient following injury (range: 031 days post-injury, median (IQR): 5 days (411 days)), by a physiotherapist trained in the CBP. Patients were advised to keep the knee fixed in the brace at all times for the first 4 weeks, including during sleep and showering. Patients were educated regarding safe use of crutches during the first 8 weeks (and use of additional mobility aids if desired, such as a knee scooter, i-Walker or wheelchair), while unable to sufficiently extend the knee to walk unaided. Patients were given advice regarding self-care, comfort and DVT risk mitigation strategies, including hydration and calf pump exercises. Prophylactic Clexane injections were introduced after the 10th patient. From patient 20 onwards, Rivaroxiban 10 mg was prescribed (for the first 8 weeks of the CBP) instead of Clexane.

After 4 weeks, the range-of-motion brace was adjusted at regular increments to allow progressive increases in range-of-motion (see online supplemental appendix 1). At week 10, unrestricted range-of-motion was allowed, and the brace was removed at 12 weeks. Weight-bearing was encouraged within the available range and patients completed standardised goal-oriented exercise-based rehabilitation while in the brace, and after brace removal until the point of return-to-sport (online supplemental appendix 1). Patients had weekly physiotherapist consults to check/adjust the brace and progress exercise-based rehabilitation (online supplemental appendix 1). Return-to-sport was not recommended until 912 months post-injury, and was dependent on patient and clinical factors, including desire to return-to-sport, completion of required rehabilitation and passing functional return-to-sport criteria.15

The first 4 patients had the brace removed and their first follow-up assessment at 9 weeks. After this, a decision was made to extend the CBP from 9 weeks to 12 weeks to protect the ACL for longer and enable more accurate interpretation of the MRI at the time of brace removal. Additionally, two patients for personal reasons (work demands/to care for young children) removed the brace at the end of week 4 and week 6. Both patients were compliant with the CBP before brace removal and completed rehabilitation post brace removal.

Details of all outcomes, including measurement method, time of measurement and interpretation, are presented in table 1.

Outcome measurement and interpretation

Patients have been involved in the development and refinement of the CBP, and the authorship team includes a patient who was managed with the CBP (MD).

All patients with acute ACL rupture managed with the CBP prior to October 2021 participated in the study, including 31 (39%) females, people aged 1058 years at the time of injury, and both private (69%) and publicly (31%) funded patients. Although only 3 women are included in the authorship team, the lead researcher is a woman and we include authors from a variety of career stages and clinical disciplines.

All continuous variables were assessed for normality and mean (SD) or median (IQR) reported, as appropriate. Participant characteristics and outcomes are presented for all participants, and based on 3-month ACLOAS. Mann-Whitney U tests were used to compare continuous outcomes (Lysholm Scale and ACLQOL scores) and Pearsons 2 tests were used to compare categorical outcomes (Lachmans test, Pivot-shift test and return-to-sport) between groups with lower versus higher ACLOAS grades on 3-month MRI (ACLOAS grades 01 vs ACLOAS grades 23). Since seven participants completed the Lysholm Scale and ACLQOL score after ACL re-rupture, a subgroup analysis was performed to present data and compare groups after excluding these seven individuals from the analysis (online supplemental appendix 2). For the two participants with missing MRI data at 3-month follow-up (decided not to undergo MRI), the ACLOAS from 6-month MRI was used to classify 3-month ACLOAS for analysis (95% of participants had the same ACLOAS at 3 months and 6 months, only 1 participant had a worse ACLOAS grade due to re-injury). Six people were missing 6-month MRI data (due to ACL re-rupture (n=3), pregnancy (n=1) or decided not to undergo MRI (n=2)). Since only one participant had missing data for the Lysholm Scale and ACLQOL scores, a complete case analysis was performed.

All individuals managed with the CBP provided consent for their data to be included in this study. Participants were aged a mean (SD) 26 (10) years at injury, 39% were female and 49% had concomitant meniscal injury (38 stable vertical tears in posterior horn of medial and/or lateral meniscus and 1 displaced medial meniscus ramp lesion). Participant characteristics are reported in table 2 for all participants and by ACLOAS grade on 3-month MRI (grade 1 vs grades 23). Participant characteristics are presented separately for participants with an ACLOAS grades 2 and 3, in online supplemental appendix 3.

Participant characteristics

At 3-month follow-up, n=72 (90%) had a continuous ACL (n=40 (50%) ACLOAS grade 1, n=32 (40%) ACLOAS grade 2). Of the 8 patients with ACLOAS grade 3 on 3-month MRI, 6 ACLs had attached to the lateral wall (n=3) or lateral wall and posterior cruciate ligament (n=3). Between 3-month and 6-month MRI, 4 participants changed from ACLOAS grade 1 to grade 0 and 1 participant changed from ACLOAS grade 2 to grade 3 due to subsequent knee injury. ACLOAS grades from 3-month and 6-month MRIs (complete case analysis) are presented in online supplemental appendix 4. Other participants sustained the same ACLOAS grade at 3 months and 6 months. MRI examples of ACL healing for five participants are presented in figure 2.

MRI images demonstrating MRI evidence of ACL healing for five participants. ACL, anterior cruciate ligament; ACLOAS, Anterior Cruciate Ligament OsteoArthritis Score.

Participants with an ACLOAS grade 1 on 3 month MRI reported better patient-reported outcomes on the Lysholm Scale and ACLQOL (including all ACLQOL subscales) compared with participants with an ACLOAS grades 23 (table 3). Online supplemental appendix 2 presents outcomes separately for participants with an ACLOAS grades 2 and 3. Online supplemental appendix 5 depicts participant scores based on time post-injury and 3-month healing status. Participants with an ACLOAS grade 1 had reduced knee laxity and a higher proportion returned to pre-injury sport (92% vs 62%) compared with participants with an ACLOAS grades 23 (table 3).

Participant outcomes

Eleven (14%) participants re-injured their ACL (mean (SD): 10 months (4 months), range: 518 months), 4 had ACLOAS grade 1, and 7 had ACLOAS grade 2 on 3-month MRI. After re-injury, 9 of 11 participants underwent ACLR (mean: 2 months after re-injury, range: 06 months), 1 participant decided to undergo the CBP again (resulting in evidence of ACL healing on MRI, ACLOAS grade 1). Mechanisms of re-injury included AFL/rugby (n=3), basketball (n=1), skiing (n=1), cycling accident (n=1), netball (n=1), Oz-tag (n=1), wrestling (n=1), dancing (n=1) and climbing (n=1). The four participants who re-injured their ACL despite ACLOAS grade 1 on 3-month MRI, did so during high-speed skiing/cycling accidents (5 months and 18 months post-injury), rugby (contact injury 10 months post-injury) and AFL (contact injury 17 months post-injury).

Two of 80 (2.5%) participants underwent an arthroscopic knee surgery, one participant for cyclops lesion removal 7 months post-injury and another underwent a partial lateral meniscectomy 5 months post-injury. Thirty eight of 39 (97%) meniscal tears were asymptomatic following the CBP, including one displaced medial meniscus ramp lesion.

Two patients were diagnosed with a below knee DVT (before DVT prophylaxis was added to the protocol), which were identified in the second week of the CBP, and were successfully managed with therapeutic dosing of Clexane. Both patients completed the CBP. Follow-up Doppler ultrasound demonstrated complete resolution of the DVT for both patients. Thereafter (11th patient onwards), DVT risk mitigation strategies were deployed as described in the Methods section.

Most patients reported mild and transient discomfort while adapting to the brace during the first week, often citing an awkward or uncomfortable sleeping position with the knee fixed at 90. This discomfort resolved for all patients without intervention. No patients opted to exit the programme due to discomfort or complication. At the time of unrestricted knee flexion in the brace, a flexion contracture (typically 515) was observed in 11 patients (14%). This resolved in all patients with physiotherapy exercises within 3 weeks. Contralateral lower limb overuse injuries, including pes anserine bursitis (n=1), insertional hamstrings tendinopathy (n=1) and patellofemoral pain (n=3), were observed at the time of brace removal.

This case series found that 72 out of 80 (90%) people with acute ACL rupture who were managed with a novel bracing protocol involving immobilisation of the knee at 90 flexion, had evidence of ACL healing (a continuous ACL) on 3-month MRI. An ACLOAS grade 1 on 3-month MRI was associated with better 12-month knee function and QOL, reduced passive knee laxity and a higher rate of return-to-sport, compared with an ACLOAS grades 23.

A recent analysis of the KANON trial found that 16 of 54 (30%) participants randomised to initial rehabilitation and optional delayed ACLR had signs of ACL healing on a 2-year MRI.9 Of the 30 participants who were managed with rehabilitation alone, 53% had MRI evidence of ACL healing at 2 years.9 In comparison, applying the same criteria we observed ACL healing in 72 of 80 (90%) participants on 3-month MRI. Six of 8 ACLs with discontinuous fibres had attached to the lateral wallposterior cruciate ligament. Although we graded these as discontinuous, it is possible that attachment to these structures could provide some function/stability, and it is not clear how this compares to the function/stability of an ACL graft. The high rate of healing observed on 3-month MRI suggests that the CBP could be conducive to ACL healing. To explore this potential, further research, including mechanistic studies, is required. Interestingly, patients had a range of concomitant injuries at baseline which became asymptomatic after the CBP. Only 1 of 39 patients with concomitant meniscal injuries had persistent symptoms after the CBP and underwent meniscal surgery. It is possible that the CBP could be beneficial for healing of concomitant injuries, this warrants further research.

Additionally, 37 of 40 participants (93%) with an ACLOAS grades 23 on 3-month MRI had an ACL rupture with a partial femoral avulsion, compared with only 7 (18%) participants with an ACLOAS grade 1. Although outside the scope of this study, it is possible that characteristics of ACL rupture observed on acute MRI (including partial/complete femoral avulsion, the displacement of ACL tissues outside of the intercondylar notch and gap distance between the ruptured ACL stumps) are associated with the likelihood of ACL healing. Further studies are needed to explore this possibility, with potential to inform ACL injury management decisions.

The favourable outcomes observed in patients with signs of ACL healing in our study are supported by findings from the KANON trial. In the KANON trial, participants with an ACLOAS of 02 on a 2-year MRI reported better knee function and QOL compared with participants with ACL discontinuity, and people who had delayed or early ACLR.9 Notably, only 8 (10%) patients in our study had ACL discontinuity on a 3-month MRI, and we used a different cut-off when comparing outcomes between groups. Collectively, results from the KANON trial and CBP suggest there may be a spectrum of ACL healing, whereby a more normal MRI appearance of the ACL may be associated with favourable patient outcomes.

Surprisingly, patients with an ACLOAS grades 23 reported excellent Lysholm Scale scores on average, even though scores were lower than patients with an ACLOAS grade 1. A Lysholm median score of 98 reported by people with an ACLOAS grade 1 is better than mean scores reported 2471 months after ACLR using autograft (mean scores range from 85 to 95).16 In contrast, the difference in ACLQOL scores was large between people with lower and higher grades of ACL healing. People with an ACLOAS grade 1 reported a median (IQR) ACLQOL score of 89 (7696). In comparison, people managed with ACLR or rehabilitation alone, report mean ACLQOL scores in the range of 5076, across a variety of time-points after ACL injury.17 The ACLQOL scores reported by people with an ACLOAS grades 23 may be more comparable with ACLQOL scores reported after ACLR and management with rehabilitation alone.17 Examining the ACLQOL domain scores suggests the greatest differences were within the recreational and sport participation, lifestyle and social emotional domains, with smaller differences observed in the symptoms and physical complaints and work-related concern domains.

The lower proportion who returned to sport with an ACLOAS grades 23 (64%) compared with an ACLOAS grade 1 (92%) could partly explain the lower QOL in this group considering return-to-sport is a key determinant of QOL after ACL injury.18 These return-to-sport rates are high compared with studies in ACL reconstructed individuals, where a pooled average of 55% of non-professional athletes returned to sport after ACLR.10 It should also be noted that patients in our study were aware of the degree of healing observed on MRI. It is possible that patients who received feedback that they had a suboptimal healing result on MRI had lower knee confidence and negative mental impacts compared with patients who received more positive feedback. This could also contribute to lower QOL scores in these domains.

It is not known whether a continuous ACL observed on MRI reflects restoration of pre-injury ACL function. Although, the high self-reported knee function and return-to-sport rate in people with an ACLOAS grade 1 suggests a positive association with knee function. It is important to note that 11 patients (14%) had re-ruptured their ACL at the time of follow-up. The 4 patients who re-injured their ACL despite an ACLOAS grade 1 on a 3-month MRI did so during competitive sport (rugby/AFL contact injuries) or high-speed skiing/cycling accidents. It is not clear whether re-injury of the ACL is a reflection of reduced tensile strength of the ACL fibres, considering the mechanisms of re-injury were similar to the mechanisms of initial ACL rupture. The rate of re-injury observed in our study may be comparable with re-injury rates following ACLR, whereby approximately 1-in-5 young athletes suffer a rupture of the ACL graft or contralateral ACL, and around 90% of these injuries occur after return to high-risk sports.19 Interestingly, one patient elected to undergo the CBP after re-rupturing their ACL and achieved an ACLOAS grade 1 on a 3-month MRI and returned to sport (rugby), after re-completion of the CBP. Longer-term follow-up is required to gain greater understanding of survivorship of the healed ACL and the risk of subsequent knee injury following management with the CBP.

In view of the promising outcomes of this case series and the potential advantages of preserving the native ACL following injury, further research in this area is warranted. Prognostic studies are needed to determine whether certain presentations are less likely to heal when managed with the CBP. In the future, the potential for the ACL to heal may be an important consideration when deciding on surgical or non-surgical management. We found that signs of ACL healing were apparent on MRI as early as 3 months after ACL rupture. Three months is the typical duration that people trial initial rehabilitation before considering delayed ACLR. It is possible that 3-month MRI findings could identify patients who would benefit from ACLR. Only 10% of patients with an ACLOAS grade 1 at 3 months had progressed to an ACLOAS grade 0 at 6 months. Further research is needed to understand the timeline and stages of ACL healing. Additionally, clinical trials are needed to compare outcomes for patients managed with the CBP, compared with those who are managed with ACLR or rehabilitation alone. Of particular importance will be the investigation of re-injury rates, return-to-sport, patient-reported outcomes, functional stability and the prevalence of knee osteoarthritis.

Bridge enhanced ACL repair (BEAR) is a surgical technique that augments repair of the ligament with a scaffold implant (a resorbable protein-based implant containing autologous blood) positioned between the torn ends of a midsubstance ACL tear in attempt to facilitate healing.20 An interesting area for future research is the comparison of ACL healing on MRI and clinical outcomes following management with BEAR compared with the CBP. Additionally, there may be specific ACL rupture presentations that benefit from early surgical intervention to assist with facilitating ACL healing. For example, acute ACL injuries with a large gap distance between torn remnants and acute ACL injuries with displaced ACL tissue outside the intercondylar notch might benefit from surgery to reduce and realign the ACL tissues. There could also be a role for bracing in knee flexion postoperatively to protect the repair and/or reduction of the injured ACL tissues (akin to management of displaced bone fractures with open reduction internal fixation followed by a period of postoperative immobilisation). Further research is needed to explore this potential.

This was a pragmatic study, whereby data were collected in the course of clinical practice rather than in a research setting. For this reason, some adaptations were made to the CBP overtime. Our study design did not allow comparison of outcomes with people managed with ACLR or rehabilitation alone. There is also potential for selection bias. After the 50th patient was braced, patients were discouraged from undertaking the CBP if they had a femoral avulsion and/or ACL tissue displaced outside the boundaries of the intercondylar notch. Although 14 of 29 patients underwent the CBP despite this advice, 15 of these individuals chose ACLR. The overall proportion with an ACLOAS grade 1 at 3 months may have been lower if these 15 individuals had not received this advice and underwent the CBP. Tests of passive knee laxity were performed by two unblinded physicians and may be subject to detection and observer bias, a clinical trial, including blinding of examiners, is needed. Further studies may also benefit from using a knee arthrometer to collect more objective measures of knee laxity. MRIs were graded by three radiologists who were aware that patients had undertaken the CBP. Although this case series highlights the potential for positive outcomes using the CBP, larger cohorts with longer-term follow-up and, in particular, randomised clinical trials are needed.

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Healing of acute anterior cruciate ligament rupture on MRI and ... - British Journal of Sports Medicine

Princeton hangs on to hand 1st loss of season to Duquesne – TribLIVE

By now, its no secret Duquesnes basketball schedule was assembled with postseason aspirations in mind.

Not the College Basketball Invitational, where the Dukes made an appearance last season, mind you. Not even the National Invitation Tournament.

Were building this to get to the (Atlantic 10 Tournament) championship and to get to the (NCAA) Tournament, sophomore point guard Kareem Rozier said.

Its a hard schedule, coach Keith Dambrot said, reflecting on Duquesnes 70-67 loss to Princeton on Wednesday night. We felt like we were going to have a relatively good team, so why not?

Its results such as the Dukes first loss of the season that Rozier and his teammates are hoping, come March, will shape the Dukes into a Tournament-type team for the first time in nearly five decades.

I truly believe this is the team that will do it this year, Rozier said. But to do it, youve got to go through some rough patches, and this is one of them.

Duquesne and Princeton waited until the last second to settle their outcome before the Tigers edged the Dukes and sent a boisterous UPMC Cooper Fieldhouse crowd home disappointed.

Matt Allocco scored 23 points on 10-of-13 shooting and Princeton (3-0) withstood Duquesnes last-second rush to remain undefeated.

Duquesne trailed 68-67 with a chance to come away with a win in the closing seconds, but Fousseyni Drames contested layup clanged off the rim and Rozier fouled Princetons Xaiavian Lee with four-tenths of a second remaining.

Lee converted both free throws to seal the victory for Princeton.

Lee added 20 points and Blake Peters contributed 11 for The Tigers, who led Duquesne for nearly the entire game, trailing for just 46 seconds in the first half.

A classic giant slayer the Tigers last season reached the Sweet 16 as a No. 15 seed Princeton shot 56.5%.

The Tigers carried an impressive NCAA Evaluation Tool ranking of 93 following victories over Rutgers (NET ranking of 40) and Hofstra (85).

We had our shot tonight and it didnt fall in our favor, Rozier said. It wasnt our time, and thats OK. It hurts right now. Princeton would have been a great win.

Duquesne, with a NET ranking of 137, opened the season with impressive victories over Cleveland State (185) and College of Charleston (52). And theres more to come before the A-10 opener Jan. 3 at Massachusetts.

The Dukes will face Nebraska (92) next week and four other opponents later on with impressive NET rankings: Bradley (78), Marshall (83), Santa Clara (87) and UC Irvine (102).

On Tuesday, UC Irvine and Santa Clara knocked off Power 5 conference teams, the Anteaters upsetting No. 16 Southern California and the Broncos defeating Stanford.

We have enough guys, Dambrot said.

But two big men that Dambrot has been counting on Dusan Mahorcic and Tre Williams are sidelined indefinitely by injuries.

Mahorcic, a 6-foot-10, 235-pound transfer from North Carolina State, has yet to play while working his way back from a serious knee injury. During a pregame interview on SportsNet Pittsburgh and ESPN Plus, Mahorcic said he was expecting to receive two additional Platelet-rich plasma injections and hoped to make his Duquesne debut in a month to six weeks.

The 6-7, 250-pound Williams, who sustained a hand injury on Friday against Charleston, is due back sooner than later, unless he has a complication, Dambrot said.

Until then, Duquesne will survive, he said.

But the Dukes ran into trouble Wednesday, though Dambrot quipped, If we make (the last shot), were all happy.

Jimmy Clark III led Duquesne (3-1) with 17 points. Dae Dae Grant added 16 for the Dukes, who return to UPMC Cooper Fieldhouse on Friday against Rider in a continuation of the Cornhusker Classic. The Dukes defeated Stony Brook on Monday in the first round.

Duquesne trailed at halftime for the third time in its first four games, but it couldve been by a wider margin had former Our Lady of Sacred Heart star Jake DiMichele, inserted late in the first half, not hit a 3-point shot at the buzzer for his first college points to cut the Princeton lead to 37-31.

A Grant 3-pointer pulled Duquesne within 52-49, and he nearly tied the score on the next possession, but his long attempt from the behind the arc bounded off the back of the iron and out of bounds.

Princeton then scored six unanswered points to go up 58-49.

Clark, who went to the bench briefly with his fourth foul at the 11:02 mark, returned and promptly swished a 3-pointer to cut the Princeton lead to 58-54.

A pair of Rozier free throws with 4:34 left kept Duquesne close at 63-60 and the Dukes defense then trapped Princeton into calling a timeout before the Tigers could escape.

Princeton lost possession and Drame scored on a driving layup to pull Duquesne within 63-62, igniting a crowd infused with an unusually rowdy Dukes student section.

Zach Martinis three-point play gave Princeton some breathing room again at 66-62 before Duquesne responded when Clark scored on a driving layup and was fouled. He converted the free throw to again pull Duquesne within a point, 66-65, with 1:45 left.

Alloccos acrobatic shot underneath for Princeton kept the the Tigers in control, but Grant hit a pair of free throws at the other end to make it 68-67.

The hectic early season schedule includes seven games in November for Duquesne, which appeared a step slow, at times, against Princetons methodic approach.

Its a tough team to play at the beginning of the year, Dambrot said. It was a tough game. Our guys battled to the end. Our guys are gutty guys. They played hard. They didnt quite have it, but they hung around and hung around and gave ourselves a good chance to win.

Looking relaxed, despite his teams first loss, Dambrot stood up, forced a weak smile and said, See ya next See ya in 24 hours.

Dave Mackall is a Tribune-Review contributing writer.

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Princeton hangs on to hand 1st loss of season to Duquesne - TribLIVE

UK first to approve CRISPR treatment for diseases: what you need to … – Nature.com

Sickle-cell anaemia is marked by red blood cells that are misshapen and sticky, affecting blood flow.Credit: Eye Of Science/SPL

In a world first, the UK medicines regulator has approved a therapy that uses CRISPR gene editing as a treatment for diseases. The decision marks another high point for a biotechnology that has regularly been lauded as revolutionary in the decade since its discovery.

The therapy, called Casgevy, will treat the the blood conditions sickle-cell disease and -thalassaemia. Sickle-cell disease, also known as sickle-cell anaemia, can cause debilitating pain, and people with -thalassaemia can require regular blood transfusions.

This is a landmark approval which opens the door for further applications of CRISPR therapies in the future for the potential cure of many genetic diseases, said Kay Davies, a geneticist at the University of Oxford, UK, in comments to the UK Science Media Centre.

Nature explains the research behind the treatment and explores whats next.

The approval by the Medicines and Healthcare products Regulatory Agency (MHRA) follows promising results from clinical trials that tested the one-time treatment, which is administered by intravenous infusion and was developed by Vertex Pharmaceuticals in Boston, Massachusetts, and CRISPR Therapeutics in Zug, Switzerland.

The trial for sickle-cell disease has followed 29 out of 45 participants long enough to draw interim results. Casgevy completely relieved 28 of those people of debilitating episodes of pain for at least one year after treatment.

Researchers also tested the treatment for a severe form of -thalassaemia, which is conventionally treated with blood transfusions roughly once a month. In this trial, 54 participants received Casgevy and 42 patients have participated for long enough to provide interim results. For at least one year after treatment, 39 participants, or 93% of those treated, did not need a red-blood-cell transfusion. The remaining three people had their need for blood transfusions reduced by more than a 70%.

Casgevy relies on the gene-editing tool CRISPR, the developers of which won the Nobel Prize in Chemistry in 2020.

Sickle-cell disease and -thalassaemia are caused by errors in the DNA sequence of genes that encode for haemoglobin, a molecule that helps red blood cells to carry oxygen around the body.

In sickle-cell disease, abnormal haemoglobin makes blood cells misshapen and sticky, causing them to form clumps that can clog blood vessels. These blockages reduce the oxygen supply to tissues, which can cause periods of severe pain, known as pain crises.

-thalassaemia occurs when mutations in the haemoglobin gene lead to deficient or absent levels of the oxygen-carrying molecule in red blood cells, low numbers of red blood cells and symptoms such as fatigue, shortness of breath and irregular heartbeats.

Clinicians administer Casgevy by taking blood-producing stem cells out of the bone marrow of people with either disease and using CRISPR to edit genes encoding for haemoglobin in these cells. The gene-editing tool an RNA molecule that guides the enzyme to the correct region of DNA and a Cas9 enzyme that cuts DNA.

Once the Cas9 enzyme reaches the gene targeted by Casgevy, called BCL11A, it cuts both DNA strands. BCL11A usually prevents the production of a form of haemoglobin that is made only in fetuses. By disrupting the BCL11A gene, Casgevy unleashes the production of fetal haemoglobin, which does not carry the same abnormalities as adult haemoglobin in people with sickle cell or -thalassaemia patients.

Before the gene-edited cells are infused back into the body, people must undergo a treatment that prepares the bone marrow to receive the edited cells. Once administered, the stem cells give rise to red blood cells containing fetal haemoglobin. After some time, this relieves symptoms by boosting the oxygen supply to tissues. Patients may need to spend at least a month in a hospital facility while the treated cells take up residence in the bone marrow and start to make red blood cells with the stable form of haemoglobin, the MHRA said in a press release.

Participants involved in the trials, which are ongoing, experienced side effects including nausea, fatigue, fever and an increased risk of infection, but no significant safety concerns were identified. The MHRA and manufacturer are monitoring the safety of the technology and will release further results.

One concern surrounding the approach is that CRISPR can sometimes make unintended genetic modifications with unknown side effects.

It is well known that CRISPR can result in spurious genetic modifications with unknown consequences to the treated cells, geneticist David Rueda at Imperial College London told the SMC. It would be essential to see the whole-genome sequencing data for these cells before coming to a conclusion. Nonetheless, this announcement makes me feel cautiously optimistic."

The US Food and Drug Administration is considering approval of Casgevy, whose generic name is exa-cel, for sickle-cell disease; its advisers met last month to discuss the therapy. The European Medicines Agency is also reviewing the treatment for both diseases.

For now, the therapy is likely to remain the reserve of rich nations with developed health-care systems. This treatment may not easily scale up to be able to provide treatments in low- and middle-income countries, since it requires the technology to obtain a patients blood stem cells, deliver the genetic editor to these stem cells, and then reinjection of these cells, geneticist Simon Waddington at University College London told the SMC. It is not an off the shelf medicine that can be readily injected or taken in pill form, he says.

Even in places where it win approval, the high cost of Casgevy is likely to limit who can benefit from it.

The challenge is that these therapies will be very expensive so a way of making these more accessible globally is key, said Davies.

The treatments price has not yet been settled in the United Kingdom, but estimates suggest that it could cost roughly US$2 million per patient, in line with the pricing of other gene therapies.

We have not established a list price for the UK at this time and are focused on working with the health authorities to secure reimbursement and access for eligible patients as quickly as possible, a Vertex spokesperson told Nature.

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UK first to approve CRISPR treatment for diseases: what you need to ... - Nature.com

Sickle-Cell Treatment Created With Gene Editing Wins U.K. Approval – The New York Times

Regulators in Britain on Thursday approved the first treatment derived from CRISPR, the revolutionary gene-editing method. Called Casgevy, the treatment is intended to cure sickle-cell disease and a related condition, beta thalassemia.

The manufacturers, Vertex Pharmaceuticals, based in Boston, and CRISPR Therapeutics, based in Switzerland, say about 2,000 patients in Britain with sickle-cell disease or beta thalassemia are expected to be eligible for its treatment.

The companies anticipate that the Food and Drug Administration will approve Casgevy for sickle-cell patients in the United States in early December. The agency will decide on approval for beta thalassemia next year.

In late December, the F.D.A. is expected to approve another sickle cell gene therapy by Bluebird Bio of Somerville, Mass. That treatment does not rely on gene editing, insteading using a method that inserts new DNA into the genome.

Sickle-cell disease is caused by a defective gene that leads to the creation of abnormal hemoglobin, the oxygen-carrying component in red blood cells. The cells themselves become malformed, causing episodes of extreme pain. About 100,000 Americans, who are mostly Black and Hispanic, are believed to have the illness.

In beta thalassemia, the defective gene leads to deficient levels of hemoglobin in red blood cells. The condition is rare.

Casgevy relies on CRISPR to nick the DNA, activating a gene that produces an alternative form of hemoglobin. To receive the sickle-cell treatment, patients in Britain must be at least 12 years old and have experienced repeated episodes of extreme pain.

There is no upper age limit, nor are patients excluded because they have suffered too much organ damage from sickle-cell disease, said Dr. David Altshuler, Vertexs chief scientific officer.

But the patients must have no other options. Sickle-cell disease can be cured with a bone-marrow transplant, but few patients have compatible donors.

For people struggling with the illness, the Vertex and Bluebird treatments have been a long time coming. Pain is not the only complication people with sickle-cell disease also suffer bone and organ damage and strokes. The misshapen blood cells do not survive long, resulting in anemia.

Still, the CRISPR and Bluebird treatments are onerous and will require expertise that most hospitals lack.

Patients must receive intense chemotherapy to clear their bone marrow of abnormal stem cells and make room for the genetically altered cells. Then the patients must stay a month or more in a hospital while their marrow regrows.

And gene editing is expensive. Vertex and CRISPR Therapeutics have not set a price yet in Britain that will depend on conversations with those who will be paying for it, said Stuart Arbuckle, executive vice president and chief operating officer at Vertex.

The price in the United States, though, is expected to be millions of dollars per patient. Sickle-cell disease itself is expensive, however, costing the U.S. health system an estimated $3 billion a year.

In the United States, Bluebird already has a gene therapy approved for beta thalassemia. It costs $2.8 million per patient.

Dr. Altshuler said Vertex was testing its sickle-cell treatment in children ages 5 to 11, hoping to prevent the irreversible organ damage that occurs over time.

The companys first sickle-cell patient, Victoria Gray, said on Thursday that the treatment changed her life.

Ms. Gray, a Walmart associate in Forest, Miss., was diagnosed with sickle-cell disease when she was 3 months old and had a pain crisis. Those episodes became a part of her life, resulting in frequent hospitalizations.

A lot of my dreams, I couldnt do, she said. The smallest things cold, changing weather I would end up in the hospital.

She had the gene editing treatment in 2019, when she was 33. Now, she said, all her symptoms have vanished.

It meant a new beginning, Ms. Gray said. It is more than I ever dreamed of, for everything to be gone.

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Sickle-Cell Treatment Created With Gene Editing Wins U.K. Approval - The New York Times

Novel Microfluidic Method Optimizes Stem Cell Extraction for … – Technology Networks

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Researchers from the Critical Analytics for Manufacturing Personalized-Medicine (CAMP) Interdisciplinary Research Group (IRG) of Singapore-MIT Alliance for Research and Technology (SMART), MITs research enterprise in Singapore, in collaboration with the Agency for Science, Technology and Research (A*STAR) Bioprocessing Technology Institute (BTI) and National University Health System (NUHS), have developed a groundbreaking technology capable of extracting mesenchymal stem cells (MSCs) directly from pure bone marrow also known as bone marrow aspirate (BMA), a pivotal source of MSCs without dilution.

Using a world-first continuous sorting technique on a multi-chip Deterministic Lateral Displacement (DLD) microfluidic platform, the new method doubles the quantity of MSCs obtained from bone marrow samples and shortens the time taken to around 20 minutes. It also reduces donor discomfort due to less bone marrow being extracted, speeds up cell production, and simplifies cell therapy manufacturing. This advancement represents a significant step toward more accessible and efficient advanced medical treatments that use MSCs including treatment for osteoarthritis, autoimmune and infectious diseases, and neurological disorders.

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Cell therapy is a field of medicine where cells are used as living drugs to fight diseases or restore and replace damaged cells. Advances in regenerative medicine and immunotherapy have benefited countless patients; they offer numerous new treatment alternatives to previously intractable diseases, with hundreds more in the developmental pipeline that gives new hope to patients. However, obtaining high-quality raw materials in this case, MSCs has long been a hurdle in cell therapy manufacturing, as traditional isolation methods such as centrifugation are inefficient and complex. In addition to a long processing time of around two to three hours, current methods result in low yield due to challenges such as osmotic stress and complex workflows. State-of-the-art sorting techniques such as fluorescence-activated cell sorting (FACS) rely on costly antibodies and intricate preparation, posing major limitations for manufacturing of these living medicines.

In a paper titled Scalable mesenchymal stem cell enrichment from bone marrow aspirate using DLD microfluidic sorting, recently published in the journal Lab on a Chip, SMART researchers have pioneered a revolutionary stem cell sorting platform, addressing the challenges of large-scale cell sorting and manufacturing. Using DLD microfluidic technology, a label-free cell sorting method which distinguishes between stem cells and blood cells, the platform processed small bone marrow samples (2.5mL) in just 20 minutes with double the stem cell yield compared to traditional methods, and bypasses costly reagents and complex processes.

In this method pioneered by SMART, human bone marrow samples that arrive at the laboratory undergo a simple filtration step to remove unwanted cells and tissues that could obstruct the chip. Samples are then loaded onto SMARTs sorting platform, and cells of interest (MSCs) are automatically sorted and collected in outlet reservoirs. These collected cells are then combined into a vial for further processing and quantification as needed.

This innovative breakthrough in cell sorting utilises microfluidic technologies, leveraging cells' natural properties and eliminating the necessity for labelling. With conventional methods, cells are sorted using fluorescent or magnetic tags to label certain cellular features. This is challenging as these labels could interfere with subsequent analysis and testing, or worse damage the cells. In comparison, passive techniques like the DLD method developed at SMART are user-friendly, gentle on cells and easily integrated into clinical sample processing workflows. MSCs are very sensitive to its external environment, and perturbations could alter the biology in unanticipated ways.

"This novel platform provides a fresh perspective for stem cell sorting through a more efficient, label-free and, importantly, seamless process integration into current industrial manufacturing pipeline. Our research team at SMART is excited about the possibilities this technology brings to the field of stem cell research and therapy. The successful demonstration of this technology gives us greater confidence to venture into other bioprocessing applications such as leukopheresis with great potential for clinical impact. This will significantly accelerate the development of cutting-edge treatments and improve accessibility for cell therapy," said Mr Nicholas Tan, Research Engineer at SMART CAMP and lead author of the paper.

Even though DLD cell sorting has previously been demonstrated, what is new in this work is that we were able to deploy the technique at a sufficiently high processing flow rate to impact real-world stem cell manufacturing workflow. Biomanufacturing and bioprocessing are areas in which I see much potential for applying microfluidics technology to improve overall efficiency and reduce the cost significantly, said Professor Jongyoon Han, Co-Lead Principal Investigator at SMART CAMP, Professor of Biological Engineering and Electrical Engineering at MIT and corresponding author of the paper.

Future efforts will focus on refining the technology by evaluating the quality of sorted MSCs from human bone marrow samples using methods such as reverse transcription polymerase chain reaction (RT-PCR) and differentiation assays. Simultaneously, CAMP is working towards increasing sorting speed and resolution, while refining the system's design for portability and user-friendliness, and increasing throughput to 10 ml per minute.

Our innovative approach marks a paradigm shift in cell sorting, a key process of cell therapy. By harnessing microfluidic technologies to capitalise on cells' intrinsic properties, we have eliminated the need for cumbersome and expensive labelling methods. It not only streamlines the sorting process but also ensures more accurate and reliable results in medical research. This breakthrough, driven by our commitment to advancing scientific frontiers, heralds a milestone in the realm of cellular studies," said Dr Kerwin Kwek, Research Scientist at SMART CAMP and co-lead author of the paper.

Reference:Tan Kwan Zen N, Zeming KK, Teo KL, et al. Scalable mesenchymal stem cell enrichment from bone marrow aspirate using deterministic lateral displacement (DLD) microfluidic sorting. Lab Chip. 2023;23(19):4313-4323. doi:10.1039/D3LC00379E

This article has been republished from the following materials. Note: material may have been edited for length and content. For further information, please contact the cited source.

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Priority Health Denied His Last Hope, CAR-T Cancer Treatment – ProPublica

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Forrest VanPatten was 50 and strong after years as a molten-iron pourer when he learned in July 2019 that a hyperaggressive form of lymphoma had invaded his body. Chemotherapy failed. Because he was not in remission, a stem cell transplant wasnt an option. But his oncologist offered a lifeline: Dont worry, theres still CAR-T.

The cutting-edge therapy could weaponize VanPattens own cells to beat back his disease. It had extended the lives of hundreds of patients who otherwise had no chance. And VanPatten was a good candidate for treatment, with a fierce drive to stay alive for his wife of 25 years and their grown kids.

VanPatten didnt know it, but he also had the law on his side. His home state of Michigan had long required health insurers to cover clinically proven cancer drugs.

He and his family gripped tight to the hope that the treatment promised.

Then, his insurance company refused to approve it.

Across the country, health insurers are flouting state laws like the one in Michigan, created to guarantee access to critical medical care, ProPublica found. Fed up with insurers saying no too often, state legislators thought theyd solved the problem by passing hundreds of laws spelling out exactly what had to be covered. But companies have continued to dodge bills for pricey treatments, even as industry profits have risen. ProPublica identified dozens of cases in which plans refused to pay for high-stakes treatments or procedures from emergency surgeries to mammograms even though laws require insurers to cover them.

Companies can get away with this because the thinly staffed state agencies that oversee many insurers typically dont open investigations unless patients file complaints. Regulators acknowledge they catch only a fraction of violations. We are missing things, said Sebastian Arduengo, an assistant general counsel for Vermonts insurance department.

Use our free tool to request your records and see why your insurance company turned you down.

Find Out Why Your Health Insurer Denied Your Claim

In the 34 years since Michigan began to require cancer coverage, regulators there have never cited a company for violating the law.

Like most policyholders, VanPatten had no insight into the decision made by his insurer, a nonprofit called Priority Health that covers about a million Michigan residents.

He didnt know that around the time the therapy won the Food and Drug Administrations approval, executives at Priority Health had figured out a way to weasel out of paying for it.

Through interviews with former employees and a review of company emails and VanPattens medical records, ProPublica was able to crack through the usual secrecy and expose the health insurers calculations.

Former employees said the decision not to cover this treatment and a related one was driven almost entirely by their high price tags up to $475,000. Side effects that could land a patient in the hospital can push the bill over $1 million. Priority Health number crunchers calculated to the penny the monthly cost per policyholder if the company shifted the expense to them: 17 cents. But executives didnt raise premiums or absorb the extra cost. They decided to save that money.

Patients needs werent part of the equation, recalled Dr. John Fox, then Priority Healths associate chief medical officer. It was, This is really expensive, how do we stop payment?

Over Foxs objections, fellow executives came up with a semantic workaround: These cancer drugs arent technically drugs, they argued, theyre gene therapies. All Priority Health had to do was to exclude gene therapies from its policies, and it could say no every time.

Priority Health said in a written statement to ProPublica that it provides compassionate, high-quality, affordable coverage and spends 90 cents of every premium dollar on member care.

We are committed to making medical innovations available to members as quickly as possible, regardless of cost, as soon as they have been proven to be safe and effective, Mark Geary, a spokesperson, wrote. The company said it initially didnt cover CAR T-cell therapy because there was a lack of consensus about the treatments effectiveness.

Major life-threatening complications and side effects were common, with a high rate of relapse, the statement said.

At the time of VanPattens denial there was, in fact, already substantial consensus about the medication. In December 2017, the National Comprehensive Cancer Network, then an alliance of 27 leading U.S. cancer treatment centers, spelled out in its guidelines for B-cell lymphomas which patients should receive the therapy and when. VanPattens doctor said he met the criteria.

It was, This is really expensive, how do we stop payment?

VanPattens family signed a privacy waiver giving Priority Health permission to discuss his case with ProPublica. Nevertheless, Priority Health did not respond to questions about his case or whether the company had violated Michigans mandate to cover cancer drugs when it refused to pay for his therapy.

VanPatten was disappointed but tried to remain optimistic after the first denial in January 2020. He and his wife, Betty, who worked in medical billing, knew it often took an appeal to coax the insurer to approve care.

In early February, Dr. Stephanie Williams, then the head of the blood and marrow transplant program for Spectrum Health, came to see VanPatten in his hospital room on Grand Rapids Medical Mile. It had been more than six months since his diagnosis.

He was sitting up in bed hooked up to an IV. His face, once framed by reddish eyebrows and a signature goatee, was hairless and drained of color. Betty pasted on a tight smile.

Priority Health had denied the treatment again, Williams told them, though she vowed to keep fighting.

When she left the room, VanPatten swung his legs over the side of the hospital bed. He had remained resilient and good-humored through his illness. But at that moment, he felt like Priority Health was treating him like an expense, not a person. It got to him, the idea that the insurer he dutifully paid each month knew this was his only chance and was holding it just out of reach.

He grabbed a tissue box from a tray and hurled it against the wall.

Fox, whom Willams described as the conscience of the company, had long been the point person for oncology in Priority Healths medical department. In his earlier life as a practicing physician, he had trained at the Centers for Disease Control and Prevention as a chronic disease epidemiologist. When he joined Priority Health in 2000, he admired the companys focus on preventive care and the fact that his bosses encouraged him to build deep relationships with local hospitals and doctors.

CAR T-cell therapy was a breakthrough more than 20 years in the making, and Fox had tracked clinical trials and talked to oncologists about it. By genetically reengineering patients own white blood cells, then infusing them back into the body to fight cancer, the treatment helped most participants in clinical trials get into remission within three months.

He knew this would be a game changer for patients. He also knew the law. So when news of the FDAs approval of the first CAR-T medication, Kymriah, hit his inbox in August 2017, he recalled, I said, You know, were required to cover this. This is a treatment for cancer.

But the culture at Priority Health had shifted over the previous year under new leadership to focus on cost savings, Fox and four other former employees said in interviews. The company brought in a new chief medical officer, Dr. James Forshee, in late 2016 from Molina Healthcare, an insurer known for wringing profits out of Medicaid managed care plans.

In conversations about the new treatment, several former Priority Health employees recall, Forshee pointed out that the law required covering cancer drugs, and he argued that the new treatment actually wasnt a drug; it was a gene therapy. (Through a company spokesperson, Forshee declined to comment for this article.)

Fox thought this was ridiculous. He pressed company lawyers for an opinion. Priority Healths filings with the state indicate that we have to cover FDA approved cancer drugs, Fox wrote to two members of the legal department in a September 2017 email.

Senior counsel John Samalik responded, bolstering Forshees position that Priority Health didnt have to cover Kymriah: I believe legally we have a defensible argument that Kymriah is a gene therapy and not a drug. (Samalik declined to comment through a company spokesperson.)

Fox pointed out that the company already covered another gene therapy. He told ProPublica that he suggested asking state regulators whether the cancer-drug mandate applied to Kymriah, but Forshee and at least one other executive refused.

My inference being that, if we ask the state, they would say yes, so lets not ask, Fox said. Two other former Priority Health employees involved in the discussions confirmed Foxs recollections.

The FDA approved a second CAR T-cell medication, Yescarta, seven weeks after the first approval.

When ProPublica asked if the FDA considered CAR T-cell therapies drugs, an agency spokesperson said yes. She wrote in an email that they have been regulated as gene therapies, and that they are biological products and drugs under the Public Health Service Act (PHS Act) and the Federal Food, Drug and Cosmetic Act.

Fox continued to push Priority Health to cover them; Forshee didnt budge.

As they often did for new therapies, Priority Healths actuaries calculated the price tag. They estimated that each year, one patient would need Yescarta and one Kymriah. If spread across the companys members, the therapies would cost an extra 17 cents per member per month 8 cents for Yescarta and 9 cents for Kymriah, emails show.

If the company had chosen to absorb the cost rather than raise premiums, the extra expense potentially more than $1 million for each patient receiving the therapy could have hurt its bottom line. Other insurers had also balked at the cost of CAR-T and were slow to cover it.

Priority Health made a slight tweak to its 2018 filings to state regulators, one with life-changing implications for patients like VanPatten. As it had in the past, the company said it covered drugs for cancer therapy as required by state law. But the insurer slipped in a new sentence more than a dozen pages later: Gene therapy was not a Covered Service.

Watch the Scripps News Report Hope Denied

Meanwhile, regional and national health plans began approving the drugs. Kaiser Permanente started covering them within months of the FDAs approvals. Blue Cross Blue Shield of Michigan the states biggest health plan and Priority Healths main competitor paid for a cancer patient to receive CAR T-cell therapy in December 2017. (A spokesperson said in an email that the plan added coverage based on the treatments efficacy, without considering whether Michigans mandate applied. We would have covered these drugs irrespective of the law, she said.)

When the national Blue Cross Blue Shield Association made an announcement about CAR-T coverage later in 2018, employees at Priority Health forwarded it to one another. It was an I-told-you-so moment for Fox.

At a meeting that December, Fox made the case again that Priority Health should ask the state whether Michigans law required covering the new cancer treatments.

Forshee bristled. You dont trust our legal counsel? he responded, according to Fox and another executive who attended.

His own temper rising, Fox considered what would happen if the company maintained its position. Patients who needed these therapies would likely die. Fox and his team would have to sign the denial letters, knowing the despair and anger they would sow.

After working at Priority Health for more than 18 years, Fox had once thought hed retire there. He left that meeting certain he had to move on.

Health plans have a right to make money; were providing a service, Fox said. But we have to do that honestly and fairly, putting patients first, not profits or premiums first. To me, thats where we crossed the line.

About seven months later, on a sticky night in July 2019, Forrest and Betty VanPatten were sipping beers with friends at the local club of the Fraternal Order of Eagles.

When theyd moved to Sparta, a small Michigan town known for its apple orchards, this was where theyd found community. The club had hosted countless charity raffles and fundraisers, including a pink night for the American Cancer Society for which Forrest squeezed into a hot-pink minidress Betty sewed for him. (There wasnt much off-the-rack that could fit his almost 6-foot-8-inch frame.)

They were expecting biopsy results at any moment. Forrest had gone to the emergency room the previous weekend with intense pain. Hed made it through two previous bouts of lymphoma and suspected he was about to face another.

Forrests phone rang. It was the office of his primary oncologist, Dr. Brett Brinker. Oncologists meet hundreds of patients and their families, but Brinker had grown deeply fond of the VanPattens. Forrest was the guy who could talk to anyone, who made the party worth attending. Betty was his perfect foil. Their laughter and candor left a lasting impression.

The news was bad. Forrest had something called Richters transformation. It made his lymphoma significantly more aggressive and less likely to respond to conventional chemotherapy. After hanging up, Forrest typed Richters into his phone. Almost immediately, he proclaimed, This is a death sentence.

Betty needed to clear her head. She walked around the block, passing a restaurant where Forrests name was on the wall for completing a taco-eating challenge. When she got back, she urged Forrest to snap out of his defeatism.

He had just celebrated his 50th birthday and was determined to be around for his 51st. His kids, Donovan, 23, and Madison, 22, were in serious relationships, and he wanted to be there for their weddings.

So we went in and got a game plan, Betty said. Forrest would begin with chemotherapy, and, if the cancer went into remission, they would try for a stem cell transplant. If the cancer didnt go into remission, Brinker made it clear they werent out of options. He told them about CAR-T.

It felt reassuring at the time.

By January 2020, CAR-T was all they had left. Brinker said he thought the treatment could at least bring Forrests disease under control for a few years. Its hard to use the word cure when its acting like that, he said of Forrests cancer. But if they won some extra time, he said, theres always something in the wings you can hope for.

On Jan. 28, Williams, the doctor who ran the transplant program, worked with her team to submit a request for coverage to Priority Health. Williams knew the companys policy on CAR-T but thought the insurer might relent when faced with an actual patient who was certain to die without the treatment. Plus, by that point, the federal government was covering the therapies for Medicare patients, and insurers often follow its lead.

Knowing it could take weeks to grow the cells used in the treatment, his doctors prepared to extract his white blood cells. These are diseases where we dont have a lot of time to waste, Williams said.

Then Williams office found out that Priority Health had denied the request. Forrests doctors appealed but were turned down again, prompting Forrest to throw the tissue box at the wall.

Williams felt it, too. I was deflated. I was angry, she recalled. We kept trying to work it out, and we kept hitting roadblocks.

The VanPattens didnt have the money to pay out of pocket, and Forrest didnt want to saddle his family with medical debt. His medical team filed a third and final appeal, this one to an independent reviewer.

As that went forward, the VanPattens received a letter from Priority Health explaining its reasons for denying Forrests treatment. CAR-T cell therapy is not a covered benefit, and therefore, we are unable to approve this request, the letter stated. Somehow, seeing the words in writing conveyed a different finality, sending Forrest into a downward spiral.

Everybody deserves the chance of fighting, Betty said. Once you take somebodys hope away, you kill them you really, really do. It was evident with him. He was defeated, and he had never been defeated in his life, and that was hard to watch.

He was defeated, and he had never been defeated in his life, and that was hard to watch.

Their son, Donovan, took to social media to blast Priority Health for its decision, hoping to shame the company into a last-minute about-face. He included a screenshot of a text message from Forrest, who knew his insurer was an outlier. It should be noted that Blue Cross and Blue Shield of MI pays for Car T Cell! it read.

A reporter for Scripps News Grand Rapids, WXMI, a local TV news station, interviewed Forrest on Feb. 13 in the suede recliner hed long claimed as his chair in the familys living room.

I feel like Im being ignored, he said, tears streaming down his face. Left out to die, basically.

Days later, Forrest was back in Butterworth Hospital with shortness of breath. He is in acute distress, an emergency room doctor noted when he was admitted.

The following night, his heart stopped beating. Betty retreated to the back of the room as doctors and nurses swarmed in. Donovan sat in a chair outside, his head in his hands.

Madison raced through Grand Rapids snow-covered streets to join them. When she reached her fathers room, a member of the medical team was still pushing down on his chest. But, she recalled, it was clear he wasnt there anymore. The family told his doctors to end the resuscitation effort.

Forrest died on Feb. 17, before the independent medical reviewer had a chance to weigh in. Three weeks had passed since Williams and her team had asked Priority Health to cover the therapy.

Williams said that if Priority Health had approved the first request, Forrest could have received the infusion. Its unknowable whether the treatment would have given him more time, she said, but if hed had that chance, anything is possible.

Not long after Forrest died, his family received a handwritten card from a clinical coordinator who cared for him.

I am so so so sad that we didnt get the chance to put the rest of our plan into motion, she wrote. In honor of your kind (+very funny) husband, dad, friend, I promise to continue to push for Priority Health to cover CAR-T and to bring hope to all who need it.

In Priority Healths statement, Geary, the spokesperson, wrote that the company began covering the therapy after extensive clinical work improved the treatment. The company would not say when it began paying for the treatment or whether Forrests death influenced its decision.

It is devastating when a disease takes a members life, the statement said. We recognize the deep pain of losing someone you love.

To former state Sen. Joe Schwarz, now 86 and retired, the story of Priority Health and Forrest VanPatten is a painful echo of a problem he thought hed fixed.

More than 30 years ago, Schwarz helped write the Michigan law requiring insurers to pay for cancer drugs. Schwarz, a physician, still recalls what drove him to action: Insurance companies were refusing to pay for drugs given to make chemotherapy more effective, arguing they werent themselves chemotherapy. An op-ed in the Wall Street Journal by the head of the Association of Community Cancer Centers confirmed that insurers nationwide were denying coverage for cancer patients.

At a Senate hearing, Schwarz accused health plans of abandoning their policyholders based on a play on words. When ProPublica told Schwarz about Priority Healths gene-therapy argument, he let out a mirthless hah, scoffing at the wordplay.

You shouldnt split hairs between the term gene therapy and the term chemotherapy or the term radiation therapy or the term surgical therapy, he said. Theyre all cancer therapies and they should all be covered.

You shouldnt split hairs between the term gene therapy and the term chemotherapy or the term radiation therapy or the term surgical therapy. Theyre all cancer therapies and they should all be covered.

ProPublica gave Michigans Department of Insurance and Financial Services a detailed description of VanPattens case, as well as Priority Healths contention that it didnt have to cover CAR T-cell cancer therapies. We asked if Priority Health broke the state law on cancer treatments. Laura Hall, the departments communications director, wouldnt say. The agency can investigate if it spots a pattern of improper denials, but in general, she said, it only acts if a patient or their representative files a complaint.

The VanPattens didnt do that. And they didnt know about the Michigan law until ProPublica told them about it.

In the months after her husband died, Betty VanPatten was too weighed down by grief and anger to tangle with Priority Health through state insurance regulators. The days were a blur. Donovan and his partner, McKenzie, moved in with Betty, who threw herself into her job.

Id get up at 4, and Id have my laptop and I just worked until about 9 or 10 oclock, Betty said. And a lot of times Id just sit there and the tears are just running down my face.

The VanPattens still struggle with the sense that Forrest suffered an injustice and that Priority Health got away with it.

They lost sight of the patient, Betty said at a family dinner this July. Madison agreed.

Insurance is meant to protect people, she said, not to make them fight through the last day to get what they should.

Do You Have Insights Into Dental and Health Insurance Denials? Help Us Report on the System.

Insurers deny tens of millions of claims every year. ProPublica is investigating why claims are denied, what the consequences are for patients and how the appeal process really works.

Kirsten Berg contributed research.

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Priority Health Denied His Last Hope, CAR-T Cancer Treatment - ProPublica

Vor shares new data for stem cell therapy; Melinta partners with … – Endpoints News

Plus, news about BeiGene, Zymeworks, Rznomics, and Adicet:

Vor Bio shares early data for its gene-edited stem cell therapy: The company announced Thursday that its stem cell treatment seemed to engraft normally in seven patients with acute myeloid leukemia (AML) treated so far. Three patients who received Mylotarg Pfizers AML drug saw protection from deep cytopenias, or a steep drop in blood cell counts thats often seen as a side effect of the drug. Mylotarg targets CD33, an antigen found in high levels on leukemia cells but also expressed in some normal cells. Vor, founded on research led by Siddhartha Mukherjee, edits CD33 out of donor stem cells with the goal of sparing patients from the treatments side effects. More data are set to be presented at ASH, the company announced last week. Lei Lei Wu

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Vor shares new data for stem cell therapy; Melinta partners with ... - Endpoints News

Efficient protocol for the differentiation of kidney podocytes from … – Nature.com

Human iPSC culture

All the experiments involving hiPSCs were approved by the ethics committee of Kansai Medical University (Approval Number: 2020197). We obtained the written informed consent of the donors from whom hiPSCs were derived. The study was performed according to the principles of the Declaration of Helsinki, as revised in 2013, and relevant institutional guidelines. Human iPSCs (585A1, 253G1, and HiPS-RIKEN-2F) were maintained with feeder-free cells using NutriStem hPSC XF (05-100-1A, Sartorius AG, Goettingen, Germany) on plates coated with iMatrix-511 silk (892021, Matrixome, Osaka, Japan) at 37C in a 5% CO2 incubator. Single cells were prepared from hiPSC colonies (7090% confluent) using Accutase (AT104, Innovative cell technologies, CA, USA) for subsequent passage and the induction of podocyte differentiation.

We generated podocytes from hiPSCs by modifying a previously reported differentiation protocol16 (Fig.1A). Human iPSCs were seeded at 3000 cells/well in 96 well low-cell-binding V-bottom plates, which were cultured in 200L NutriStem medium containing 10M Y27632 (FCS-10-2301-25, Focus biomolecules, PA, USA) at 37C for 24h. The medium was changed to DMEM Hams/F12 medium (048-29775, Fujifilm, Osaka, Japan) containing 2% B27 supplement (17504044, Thermo Fisher Scientific, MA, USA), 1ng/mL human activin A (338-AC, R&D Systems, MN, USA), and 20ng/mL fibroblast growth factor 2 (FGF2, 064-04541, Fujifilm). After 24h, cell aggregates were cultured for 6days in a medium (DMEM Hams/F12 medium) containing 2% B27 supplement and 10M CHIR99021 (10-1279, Focus biomolecules) that was changed every 2days. Subsequently, the medium was changed to one containing 10ng/mL human activin A, 3ng/mL human bone morphogenetic protein 4 (BMP4, PROTP12644, R&D System), 3M CHIR99021, and 100nM retinoic acid (RA, 302-79-4, Fujifilm). After a further 72h, this medium was switched to one containing 1M CHIR99021 and 10ng/mL FGF9 (273-F9, R&D Systems) without medium change to induce the differentiation of NPCs.

Differentiation of hiPSCs into podocyte. (A) Timeline and factors involved in the differentiation of hiPSCs into podocytes. (B) mRNA expression of podocyte-associated genes (NEPHRIN, PODOCIN, and SYNAPTOPODIN) during the 24days of culture. Results are shown as the meanSD of 6 samples. Statistical analysis was performed using one-way ANOVA with Bonferronis test. **p<0.01, ***p<0.001. (C) Immunostaining for markers of podocytes (NEPHRIN and PODOCIN) and F-Actin in differentiated cells, with nuclei stained with Hoechst. (D) mRNA expression of podocyte-associated genes (NEPHRIN, PODOCIN, and SYNAPTOPODIN) in hiPSCs, NPCs and differentiated podocytes. Results are shown as the meanSD of 6 samples. Statistical analysis was performed using one-way ANOVA with Bonferronis test. *p<0.05 (E) Protein expression of nephrin and podocin in hiPSCs, NPCs and differentiated podocytes, assessed using western blotting analysis. (F) Protein expression of undifferentiation stem cell marker (OCT-3/4) and nephron progenitor cell marker (SIX2) in hiPSCs, NPCs and differentiated podocytes, assessed using western blotting analysis. (G) Protein expression of nephron progenitor cell marker (SIX2) assessed using western blot analysis. Results are shown as the meanSD of 3 samples. Statistical significance was assessed using Students t-test. *p<0.05.

To generate podocytes, the medium was switched to one containing 3M CHIR99021, and after 24h, to one containing 2M IWR-1 (1127442-82-3, Fujifilm), 5M SB431542 (13031, Cayman Chemical, MI, USA), and 10M RA. After a further 24h, the differentiated cells were cultured for 11days in fresh medium containing 2M IWR-1 and 5M SB431542, which was replaced every 3days. Cell sorting was not performed at all steps.

To construct the monolayer cell culture, the cell aggregates were transferred to a 50-mL centrifuge tube, washed with PBS, then dissociated using Accutase. The cells (2,000 cells/cm2) were then seeded onto iMatrix-511 silk-coated dishes and cultured in DMEM Hams/F12 medium supplemented with 10M Y27632 and 2% B27 supplement. Cells were collected 24h after the treatment with DMEM Hams/F12 medium supplemented with Y27632 and B27 supplement.

To evaluate the involvement of the mTOR pathway in podocyte differentiation, rapamycin (R0161, LKT Laboratories, MN, USA) was administered at various times during the differentiation process and evaluated by mRNA expression using RT-PCR. In addition, S6 downstream of mTOR was inhibited using LY2584702 to further assess its involvement in the mTOR pathway.

RNA was extracted from the cells using ISOGEN II reagent (311-07361, Nippon gene, Tokyo, Japan), then a ReverTra Ace qPCR RT Master Mix (FSQ-201, Toyobo, Osaka, Japan) was used for reverse transcription. Real-time PCR was performed to quantify target mRNA expression using a Rotor-Gene Q (Qiagen) and Thunderbird SYBR qPCR Mix (QPS-201, Toyobo). The specific PCR primers used are listed (Table 1).

Cell lysates were collected using 4Bolt LDS Sample Buffer (B0007, Thermo Fisher Scientific), then electrophoresed on a 10% SDS polyacrylamide gel and blotted onto PVDF membranes. The membranes were incubated with anti-NEPHRIN (29070, Immuno-Biological Laboratories, Gunma, Japan), anti-PODOCIN (MBS9608910, Thermo Fisher Scientific), anti-Phospho-Akt (9271, Cell Signaling Technology, MA, USA), anti-Akt (9272, Cell Signaling Technology), anti-Phospho-mTOR (2971, Cell Signaling Technology), anti-mTOR (2972, Cell Signaling Technology), anti-Phospho-p70 S6 Kinase (9205, Cell Signaling Technology), anti-p70 S6 Kinase (2708, Cell Signaling Technology), anti-Phospho-S6 Ribosomal Protein (2211, Cell Signaling Technology), S6 Ribosomal Protein (2217, Cell Signaling Technology), anti-SIX2 (80170, Cell Signaling Technology), anti-OCT3/4 (611202, BD Biosciences, NJ, USA), and anti- actin (MAB8929, R&D Systems) primary antibodies, then further probed with anti-mouse IgG horseradish peroxidase-linked (A90-131P, Bethyl Laboratories, TX, US) secondary antibody. Specific protein bands were visualized using Pierce Western Blotting Substrate (NCI3106, Thermo Fisher Scientific).

Cultured cells were harvested after detachment using Accutase, then incubated for 30min at 4C with FITC-conjugated anti-PODOCIN antibody diluted 1:20. The cells were then centrifuged, the supernatants removed, and 500-L aliquots of PBS containing 2% StemSure Serum Replacement (191-18375, Fujifilm) added. Data were acquired using a BD FACS Canto II flow cytometer system (BD Biosciences).

Cells were fixed using 4% paraformaldehyde, and blocked with Blocking One (03953-95, Nacalai Tesque, Kyoto, Japan) for 60min at room temperature. Incubations were then performed at 4C overnight using primary anti-NEPHRIN, anti-PODOCIN antibody, and F-Actin (bs-1571R, Bioss Inc., MA, USA) antibody. Then, Alexa Fluor 488-tagged secondary antibody (ab150107, Abcam, Cambridge, UK) was applied for 30min at room temperature, and nuclei and F-actin were stained using 10g/mL Hoechst 33342 (346-07951, DOJINDO Laboratories, Kumamoto, Japan) and Phalloidin-iFluor 647 Conjugate (23127, AAT Bioquest, CA, USA), respectively. The stained cells were evaluated using fluorescence microscopy (BZ-X810, Keyence, Osaka, Japan).

Podocytes differentiated from hiPSCs were seeded at 2000 cells/cm2 onto Transwell inserts in six-well culture plates, pore size 0.4m (3450, Corning, AZ, USA) coated with iMatrix-511 silk. After 24h, DMEM Hams/F12 medium containing 2% B27 supplement, potassium chloride (5mM), urea (25mg/L), and human serum albumin (3g/dL) were added to the lower chambers, whereas the cells were incubated in a medium lacking the latter three substances in the upper chambers. After 24h, the media were collected from both of the chambers. The potassium concentration was measured using reagent for potassium measurement and electrode (EA09, A&T Corporation, Kanagawa, Japan). The urea nitrogen and albumin were measured using CicaLiquid-N UN reagent (77697, Kanto Chemical, Tokyo, Japan) and reagent of modified BCP method for albumin (30155001, Sekisui Medical, Tokyo, Japan), respectively, by an autoanalyzer (JCA-BM8020, JEOL Ltd., Tokyo, Japan).

Data are expressed as meanstandard deviation (SD). All experiments resulted by repeating the experiment three independent times. For the results shown in Figs.1B, 2A, and 3B, statistical analysis was performed using one-way ANOVA, followed by Bonferronis test; and Students t-tests were performed to compare the mean values of two groups for the data shown in Figs.2C and 5B. A p-value of<0.05 was considered to indicate statistical significance.

Effects of an mTOR inhibitor on podocyte differentiation. (A) Evaluation of the timing of rapamycin administration for protocol improvement: (a)13days treatment, (b)11days treatment and (c)7days treatment. (B) mRNA expression of podocyte-associated genes (NEPHRIN, PODOCIN, WT1, and MAFB) in cells treated with 100nM rapamycin at different times (a, b, c). Results are presented as meanSD of 6 samples. Statistical analysis was performed using one-way ANOVA with Bonferronis test. *p<0.05, **p<0.01. (C) mRNA expression of podocyte-associated genes (NEPHRIN, PODOCIN, SYNAPTOPODIN, WT1, and MAFB) in cells treated with various concentrations of rapamycin. Results are shown as the meanSD of 6 samples. Statistical analysis was performed using one-way ANOVA with Bonferronis test. *p<0.05, **p<0.01, ***p<0.001. (D) Protein expression of nephrin and podocin in differentiated podocytes, assessed using western blotting analysis. (E) Protein expression of nephrin and podocin assessed using western blot analysis. Results are shown as the meanSD of 3 samples. Statistical significance was assessed using Students t-test. *p<0.05. (F) Histograms for podocin-positive cells, quantified using FACS: (a) undifferentiated hiPSCs and (b) podocytes differentiated from hiPSCs.

Importance of the mTOR pathway for podocyte differentiation. (A) Protein expression of mTOR, p-mTOR, p70 S6K, p-p70 S6K, S6, p-S6, AKT, and p-AKT, assessed using western blotting analysis. (B) mRNA expression of podocyte-associated genes (NEPHRIN, PODOCIN, SYNAPTOPODIN, WT1, and MAFB) following the addition of the S6 inhibitor LY2584702. Results are shown as the meanSD of 6 samples. Statistical analysis was performed using one-way ANOVA with Bonferronis test. ***p<0.001.

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A better way to study Parkinson’s disease in the lab could lead to … – EurekAlert

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Lalitha Madhavan, MD, PhD, and her research team used induced pluripotent stem cell technology to reprogram adult skin cells into brain cells to study Parkinsons disease.

Credit: University of Arizona Health Sciences

A recent study published in Progress in Neurobiology and led by researchers at the University of Arizona College of Medicine Tucson has developed an improved method to study Parkinsons disease in the lab. Along the way, researchers also uncovered clues that may help scientists figure out how to detect Parkinsons earlier and point the way toward better treatments.

Around a million Americans are living with Parkinsons disease, a neurological disorder that causes difficulty in movement, balance and cognition. Symptoms worsen until tasks like walking, talking and swallowing present enormous challenges. While there is no cure, there are treatments that control symptoms but their effectiveness wanes over time and they are associated with unwanted side effects.

Its a slow-developing disorder. We only diagnose the disease at a late stage, when 60-70% of dopamine neurons are dysfunctional or have died off, said Lalitha Madhavan, MD, PhD, associate professor of neurology at the College of Medicine Tucson, part of UArizona Health Sciences. We have treatments, but at that point youre trying to throw a small glass of water on a raging fire. Being able to diagnose the condition at the earliest stages would be a big step.

Madhavans team used cells from Parkinsons patients to create a human-derived laboratory model to study the disease. Using induced pluripotent stem cell technology a powerful technique that transforms adult cells into embryo-like cells that can then mature into any cell type the lab reprogrammed adult skin cells called fibroblasts into brain cells.

Using the reprogrammed neurons, Madhavan Lab researchers discovered several changes in the cells from Parkinsons subjects that differentiated them from cells of healthy individuals. Madhavan hopes this finding can form the basis for better cell-culture systems for studying Parkinsons disease in the lab, potentially leading to improved diagnostics and treatments.

The experiments also showed that skin cells may act as a window into the brain. Skin cells dont cause neurological symptoms, but some of the same changes that damage brain cells might also affect skin cells, producing similar molecular signatures.

We wanted to make neurons from skin biopsies using this fantastic technology; however, we noted along the way that the fibroblasts themselves seemed to have signatures that differentiated individuals with Parkinsons. We started to dig deeper into that, Madhavan said. Its exciting that weve shown that connection, and that it tells us skin cells could perhaps be used to diagnose the disease early.

The team hopes that, in the future, doctors will be able to catch Parkinsons disease earlier by examining skin cells for signs that the disease is brewing.

This could be a system in which we could very carefully diagnose people at early stages, Madhavan said, adding that her team received a patent on a method for examining skin cells for molecular signs that correlate to Parkinsons disease.

They are now investigating how skin cells change over time to learn more about how the disease progresses and how to identify it early. Tech Launch Arizona, the University of Arizonas technology commercialization office, is helping protect the innovation and developing strategies to take it from the laboratory to the marketplace where it can impact the lives patients and their doctors.

Madhavan says that if we could catch Parkinsons disease earlier, doctors could prescribe currently available treatments that can slow disease progression. Simultaneously, scientists could work to develop next-generation Parkinsons drugs that target the disease in its early stages.

Because a patients skin cells are easy to access especially compared to brain cells Madhavan also hopes the system could be used for a precision-medicine approach, matching patients with optimized treatments based on a skin biopsy and lab test showing which drug might work best based on their unique genetic profile.

Weve been putting Parkinsons into one big bucket when actually different people express it differently, she said. This system would allow us to carefully classify Parkinsons and assess treatments more effectively based on such a classification.

The lead authors on the study were Mandi Corenblum, MS, senior research specialist, and Aiden McRobbie-Johnson, physiological sciences graduate student. Co-authors include Kelsey Bernard and Timothy Maley, graduate students in neuroscience and physiological sciences; Emma Carruth, undergraduate student in physiology; Moulun Luo, PhD, associate research professor of medicine; Lawrence Mandarino, PhD, professor of medicine; Maria Sans-Fuentes, PhD, BIO5 Institute statistician; Dean Billheimer, PhD, professor in the UArizona Mel and Enid Zuckerman College of Public Health and director of statistical consulting at the BIO5 Institute; and Erika Eggers, PhD, professor of physiology and member of the BIO5 Institute.

The study was supported mainly by a Michael J Fox Foundation grant (MJFF 18366) and in part by grants from the National Eye Institute, a division of the National Institutes of Health, under award nos. R01EY026027 and NSF1552184.

Progress in Neurobiology

Randomized controlled/clinical trial

Cells

Parallel neurodegenerative phenotypes in sporadic Parkinsons disease fibroblasts and midbrain dopamine neurons

22-Oct-2023

Declaration of Competing Interest None.

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.

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A better way to study Parkinson's disease in the lab could lead to ... - EurekAlert

Lab-grown ‘small blood vessels’ point to potential treatment for major … – EurekAlert

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Disease mural cells stained for calponin (mural cells marker, green), collagen IV (magenta) and DAPI (nuclei, blue)

Credit: Alessandra Granata/University of Cambridge

Cambridge scientists have grown small blood vessel-like models in the lab and used them to show how damage to the scaffolding that supports these vessels can cause them to leak, leading to conditions such as vascular dementia and stroke.

The study, published today in Stem Cell Reports, also identifies a drug target to plug these leaks and prevent so-called small vessel disease in the brain.

Cerebral small vessel disease (SVD) is a leading cause of age-related cognitive decline and contributes to almost half (45%) of dementia cases worldwide. It is also responsible for one in five (20%) ischemic strokes, the most common type of stroke, where a blood clot prevents the flow of blood and oxygen to the brain.

The majority of cases of SVD are associated with conditions such as hypertension and type 2 diabetes, and tend to affect people in their middle age. However, there are some rare, inherited forms of the disease that can strike people at a younger age, often in their mid-thirties. Both the inherited and spontaneous forms of the disease share similar characteristics.

Scientists at the Victor Phillip Dahdaleh Heart and Lung Research Institute, University of Cambridge, used cells taken from skin biopsies of patients with one of these rare forms of SVD, which is caused by a mutation in a gene called COL4.

By reprogramming the skin cells, they were able to create induced pluripotent stem cells cells that have the capacity to develop into almost any type of cell within the body. The team then used these stem cells to generate cells of the brain blood vessels and create a model of the disease that mimics the defects seen in patients brain vessels.

Dr Alessandra Granata from the Department of Clinical Neurosciences at Cambridge, who led the study, said: Despite the number of people affected worldwide by small vessel disease, we have little in the way of treatments because we dont fully understand what damages the blood vessels and causes the disease. Most of what we know about the underlying causes tends to come from animal studies, but they are limited in what they can tell us.

Thats why we turned to stem cells to generate cells of the brain blood vessels and create a disease model in a dish that mimics what we see in patients.

Our blood vessels are built around a type of scaffolding known as an extracellular matrix, a net-like structure that lines and supports the small blood vessels in the brain. The COL4 gene is important for the health of this matrix.

In their disease model, the team found that the extracellular matrix is disrupted, particularly at its so-called tight junctions, which zip cells together. This leads to the small blood vessels becoming leaky a key characteristic seen in SVD, where blood leaks out of the vessels and into the brain.

The researchers identified a class of molecules called metalloproteinases (MMPs) that play a key role in this damage. Ordinarily, MMPs are important for maintaining the extracellular matrix, but if too many of them are produced, they can damage the structure similar to how in The Sorcerers Apprentice, a single broom can help mop the floor, but too many wreak havoc.

When the team treated the blood vessels with drugs that inhibit MMPs an antibiotic and anti-cancer drug they found that these reversed the damage and stopped the leakage.

Dr Granata added: These particular drugs come with potentially significant side effects so wouldnt in themselves be viable to treat small vessel disease. But they show that in theory, targeting MMPs could stop the disease. Our model could be scaled up relatively easily to test the viability of future potential drugs.

The study was funded by the Stroke Association, British Heart Foundation and Alzheimers Society, with support from the NIHR Cambridge Biomedical Research Centre and the European Unions Horizon 2020 Programme.

Reference Al-Thani, M, Goodwin-Trotman, M. A novel human 1 iPSC model of COL4A1/A2 small vessel disease unveils a key pathogenic role of matrix metalloproteinases. Stem Cell Reports; 16 Nov 2023; DOI: https://doi.org/10.1016/j.stemcr.2023.10.014

Stem Cell Reports

Experimental study

Cells

A novel human 1 iPSC model of COL4A1/A2 small vessel disease unveils a key pathogenic role of matrix metalloproteinases

16-Nov-2023

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.

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Lab-grown 'small blood vessels' point to potential treatment for major ... - EurekAlert