Author Archives: admin


In review: the life sciences regulatory regime in United Arab Emirates – Lexology

All questions

Introduction

The United Arab Emirates (UAE) biotechnology and pharmaceutical industries are subject to stringent regulation primarily by rules and regulations at the federal level and, to a lesser degree, at the individual emirate level. Abu Dhabi and Dubai have the most developed rules and regulations of the seven emirates with respect to biotechnology and pharmaceutical matters, and the other emirates usually follow their respective cues as regards policy and legislation.

As the UAE has now evolved as a member of the globalised economy, it has endeavoured to make itself a global destination for healthcare. Accordingly, much of its new legislation reflects the influence and direction of jurisdictional trends of international market players in the pharmaceutical and medical industries. There has been a growth phase in the healthcare sector in the past few years, which has helped the UAE move towards becoming a hub for medical tourism. The nation's strategy also aims to guide and support the industry by building sustainable publicprivate partnership models in the healthcare sector.

The regulatory regime

To be supplied in the UAE, therapeutic goods must be vetted by the Registration and Control Department (RCD) of the Ministry of Health and Prevention (MOHP). The importer, exporter, manufacturer or seller of medicine or medical devices must satisfy the requirements of the RCD before they can be disseminated for public consumption within the UAE.

The RCD regulates medication and medical devices (which includes a delineation for devices that include a pharmaceutical component). The RCD further oversees the examination and registration of dietary supplements (including vitamins and herbal extracts), medicated cosmetics, antiseptics and disinfectants, and all other products that contain a pharmaceutical component or medical claim that cannot otherwise be appropriately classified as a medication. Foodstuffs and general consumer products are not regulated by the RCD, provided they assert no medical or therapeutic value or claims.

The RCD and the MOHP have the unilateral right to pull or ban any products that they may later deem to be unsafe for public consumption based on studies or recent cases within the UAE.

UAE Federal Law No. 16 of 2007 (on animal protection) states, at Article 12, that the use of animals for scientific purposes must be approved by the applicable governmental authority. Further, animals are protected from neglect, abuse and cruel treatment by applicable UAE law.

The law specifically states 'scientific purposes', which seems to implicate medical or pharmaceutical testing and does not directly address or contemplate the use of animals for the testing of (non-medicated) cosmetics or household products. The governmental approval process is always at the discretion of the concerned director, who may reject any request deemed excessive, unnecessary or generally harmful.

Effective 1 January 2020, a new law has been enacted in the UAE whereunder fertility centres are now permitted to freeze human embryos, as well as unfertilised eggs and sperm for a period of five years (extendable upon request).

In vitro fertilisation (IVF) clinics are regulated pursuant to Cabinet Decision 64 of 2020 regarding the executive regulations of Federal Law No. (7) of 2019 regarding medical assistance for childbearing. Governmental approvals are contingent upon satisfaction of numerous requirements, including facilities, equipment and staffing with appropriate professional personnel. There are numerous IVF clinics throughout the UAE.

In 2010, the MOHP licensed its first stem cell practitioner, a specialist in spinal cord and brain injuries, and a facility to perform stem cell therapies within the UAE. There have been reports of autologous stem cell treatment on two patients with degenerative diseases. However, general stem cell transplants have been permitted on a restricted, alternative basis, although the storage of stem cells has been permitted. The Dubai Health Authority (DHA) approved the first stem cell and regenerative medical centre in Dubai in 2018. Abu Dhabi and Dubai are the two Emirates in the UAE that now have established public guidelines for the regulated sector of stem cell therapies. The rules and standards to be applied during the granting, collection, testing, processing, preservation, storage, distribution, import, export and implementation of procedures related to cord blood and stem cells, and other nuclei cells derived from blood-forming cells such as the bone marrow, peripheral blood, and cord blood are regulated under the Cabinet Decision No. 6/2020 on endorsement of the regulations of cord blood and stem cells storage centres.

We understand a number of memoranda of understandings have been signed regarding stem cell therapy treatments with the regulators in the UAE.

The UAE federal law permitting organ transplantation became effective in March 2017. The law allows the transplant of tissue or organs from either live or deceased patients for the care of patients in need of the same. However, the law prohibits the sale of human tissue or organs, the funding of transplantation if this results from such sale, and the unlicensed advertising of transplantation services.

All clinical and research trials within the UAE require human subject consent, as well as the written approval of the MOHP, or other concerned governmental authorities, after a review of an application for such trials.

The Guidance of the Drug Control Department of the MOHP states that the sponsor of a specific clinical trial or experimental protocol is required to secure all the necessary agreements between the concerned parties.

Designated clinical trial centres should establish independent institutional ethics committees (IECs), which are then tasked with reviewing the relevant proposals of the sponsors. These IECs will review the proposals for clinical trials and experimental protocols, taking into consideration the soundness of the objectives and the medical protocols and practices.

The IECs will render recommendations as whether or not to commence a clinical trial based upon the information provided. The findings and recommendation will then be provided to the applicable governmental authorities for their final, official approvals.

In the respective proposal, the sponsor is to set forth the compensation (if any) for the investigators and the subjects of a clinical trial in its proposal to the IEC. Furthermore, the IEC is to review and approve the proposal of the sponsor with respect to insurance coverage, indemnities or other forms of compensation in case of subject injury.

The investigator may also be the sponsor of a clinical trial, provided it independently plans, conducts and assumes full responsibility for the clinical trial.

All amendments to protocols and all unexpected or serious adverse reactions to drugs administered during the clinical trial are to be reported immediately to the Ethics Committee.

While the clear letter of the law states that no unregistered drugs may be used within the UAE, there are certain circumstances where the MOHP or other governmental departments have approved the use of unregistered drugs (discussed in further detail in Section II.iv).

The Guidance further states that all clinical trials should follow the Helsinki Declaration to safeguard the rights of individuals subject to a clinical trial.

In exceptional circumstances, governmental authorities in the UAE have permitted the importation and use of unregistered medicine into the country. The MOHP has put forth an approval process that allows such importation, under any of the following circumstances:

Because of the nature of the UAE's regulated market, applications to obtain or use unregistered medication or devices must be tailored for specific patients, trials or protocols, and exigent circumstances. As a result, the quantity of unregistered medication should be limited to a specific hospital or clinic capacity, and for existing or anticipated patients per the application. The MOHP has the discretion to reject, approve, or approve with modifications any application for unregistered medication.

Furthermore, the application to the MOHP must include the following documents or information: (1) a signed undertaking letter from the concerned hospital or clinic that it shall bear all liability for the use of the unregistered medicine; (2) a certification that the medicine is registered in the country of origin or an approved jurisdiction, such as the United States, the European Union or the Gulf Cooperation Council; and (3) a registration certificate from the manufacturer listing the chemical components of the medication.

To be supplied in the UAE, medication, pharmaceuticals and medical devices must be vetted and cleared by the MOHP. A foreign manufacturer of medication, pharmaceuticals and medical devices must establish a local presence and appoint a local representative or a local agent (which may be the same person) for the sale and distribution of these products within the UAE.

Unless there are exigent circumstances (as described in Section II.iv), there are virtually no exceptions to expedite or accelerate the approvals process. The approval of a new medication, for example, would take, on average, no less than two years from submission of an application to the relevant authorities.

The UAE is a signatory to international conventions on narcotics and psychotropic substances. When a medication is approved and registered for use in the UAE, the method of dispensation is also agreed. This is based on the level of control in the source country, as well as the level of control of the active ingredient pursuant to UAE law.

Pricing for medications is fixed by UAE law, and the MOHP provides an updated pricing list for these periodically. Attempts by manufacturers and agents to circumvent the fixed pricing may be subject to fines, bans or other legal recourse by the UAE government.

Medical devices must also be approved by the MOHP before they can be sold or distributed in the UAE. The law defines a medical device as any such device that is used to diagnose, monitor or treat an illness. UAE laws and regulations make a distinction between devices that provide therapeutic benefit through purely mechanical or non-pharmaceutical means and those devices that have a pharmaceutical component (i.e., devices that dispense a drug therapy). The latter may be subject to pricing controls similar to those of medication.

Currently, the UAE is largely dependent on the import of sophisticated medical equipment. However, recently, there has been development in the nascent medical products industry. In the near future, the UAE may play a leading role in 3D printing in the medical products sector, which could involve developing 3D-printed teeth, bones, artificial organs, medical and surgical devices, and hearing aids.

Patents in the UAE are registerable for pharmaceuticals for a period of up to 20 years, with no extension period allowed.

The UAE recognises the patentability of second-use medical inventions under the law and has registered a number of these.

There are no remarkable regulatory incentives within the UAE with respect to the marketing, developing or production of pharmaceuticals at this time.

Under the UAE law, the foreign manufacturer of a drug must appoint a local authorised representative within the UAE. The representative may also be the distributor of the medication within the UAE. The representative will be tasked with handling all complaints or recalls relating to the medication, as well as fulfilling all requirements with respect to placing the product in the market. The post-market obligations include the obligation to maintain distribution records, complaint-handling procedures and incident-reporting processes, and implement processes to execute investigations and recalls in respect of defective or potentially defective products promptly.

The RCD or MOHP have the discretion to recall any medication based on any information or incident reports directed to them.

The MOHP newly established a decree in June 2021 for a system wherein pharmaceutical products within the UAE and those entering the UAE are tracked and traced for authenticity and legality. This decree applies to all standard pharmaceutical products traded in the UAE. To develop a centralised platform, MOHP, in partnership with EVOTEQ, is developing the track-and-trace platform Tatmeen, which will be used to track individual events in the drug supply chain and confirm their authenticity.

The relevant governmental authorities must approve a pharmaceutical manufacturing plant within the UAE.

The proposed facility must be approved as far as its layout, infrastructure, manufacturing capacities, and its storage and handling of chemicals. The government reserves the right for site inspections and for assessing penalties upon non-compliant facilities.

The UAE has repealed the Commercial Companies Law (Federal Law No. 2 of 2015, CCL) by issuing Federal Decree Law No. 32 of 2021 (Decree Law) and thereby overhauling the entire corporate legal framework by removing the requirement to have 51 per cent share capital owned by majority UAE national shareholders or a company wholly owned by UAE nationals (except for certain activities of strategic importance). The said changes are effective from 2 January 2022.

Healthcare and medical advertising are strictly regulated by governmental authorities and there are stringent guidelines to ensure transparency and honesty, and to stamp out misleading marketing practices. All forms of medical and pharmaceutical advertising require governmental pre-approval before publication. Comparative advertising is usually not permitted and, given other considerations (mainly relating to potential criminal liability for libel or harm to business reputation), most companies steer clear of any advertising pitting themselves against their competitors. Even advertisements on discount websites for businesses such as laser hair removal or dermal fillers require MOHP approval and carry a requisite warning to customers relating to efficacy or potential risks of such procedures.

Additionally, advertisements must not violate public morals, decency, UAE customs or Islamic values and traditions. Medical advertising cannot be false, deceptive or misrepresent the quality or type of medical treatment or product presented. Further, it cannot mislead potential patients regarding the efficacy of certain medication treatment, therapy or protocol, or that the aforementioned will have no potential side effects.

Advertising for telemedicine companies should clearly state what services they are and are not authorised or licensed to provide. Advertisements geared towards children are prohibited.

Incentives to healthcare workers for the sale of specified medications, procedures or devices are not permitted by any medical or healthcare advertisement.

The UAE has a number of provisions within its Agency Law, Civil Code and Commercial Code that provide a number of protections to local agents and distributors. Some pharmaceuticals or medical equipment may, in certain circumstances, require a registered 'commercial agent' to be the importer on record. Such registered commercial agents enjoy wide protections under the UAE's Agency Law, including exclusivity within the UAE market.

A registered agency under the Agency Law makes it difficult for a foreign principal to terminate. Often, a registered agency will only agree to deregister a registered agency (and, hence, allow the principal to distribute products through other agents or resellers) upon an agreed and substantial financial settlement. A new draft Agency Law was discussed in mid-2022 in which a commercial agency can be terminated by mutual agreement of the parties or on the expiry of its term. The criticism of the current law of Agency Law as biased in favour of UAE national commercial agents (i.e., cannot be easily terminated even at the expiry of the contractual term) over foreign principals may be put to rest if the draft law is released in the format discussed in the press.

In addition to the basic definition of 'prescription' medication, the MOHP recognises the following three classifications: narcotics, CDA and CDB.

Narcotics are defined based upon their active ingredients and composition. Additionally, CDA medications are defined by their active ingredients, as well as their potential for abuse or diversion for illegal use. CDB medications are defined as those that are used for psychiatric conditions, avoid narcotic controls and restrictions owing to their chemical formulation, or require stricter control than simply those medications that are designated as 'prescription'.

Medical devices are classified in order of risk:

That being said, the vast majority of medication or medical devices that fall outside the categories of stricter scrutiny are available for sale and distribution over the counter.

To import medicine or medical devices into the UAE, a UAE company must obtain a medical warehouse licence or a UAE national must obtain a medical importer licence with the relevant government authorities. The law was amended to permit companies with mixed UAE and foreign shareholding to obtain a medical import licence.

Re-exportation of imported goods can occur within six months of importation, provided the goods are in unused and otherwise exportable condition and the applicable documentation relating to the goods is current.

The UAE abolished the Boycott of Israel Law in 2020 and subsequently revoked all trade restrictions that were previously in place with Israel.

Controlled substances are heavily regulated and monitored in the UAE. In most circumstances, narcotics or psychotropic substances can only be administered within the confines of a hospital or clinic, or dispensed exclusively from a government hospital upon submission of a valid prescription.

The MOHP has a list of controlled substances that cannot be brought into the UAE by people visiting or entering the country, regardless of whether the person has a valid prescription for the medication in the country of origin. UAE residents and travellers are allowed to import narcotic medicines and psychotropics (controlled medicine) for personal use to the country upon the issue of a permit from the MOHP official portal.

The UAE governmental authorities have broad powers of regulation and sanction for the violation of any laws or regulations relating to medication and medical devices. These include: warning, fining, banning of distribution of certain products, blacklisting of manufacturers or medication, suspension or deregistration of local representatives or agents, and closing operations of pharmaceutical plants. The fines may be substantial, and imprisonment may be warranted in cases of intentional criminal activity.

The UAE has enacted the Health Data Protection Law (UAE Federal Law No. 2 of 2019), with the objective of addressing the protection of health data originating in the UAE. This law derives principles from the European Union's General Data Protection Regulation, including purpose limitation, accuracy, integrity and confidentiality. Any health-related information and data that originates in the UAE may not be stored, processed, generated or transferred outside the UAE certain exceptions to this rule were clarified in an amendment to the law in 2021. This has a direct effect on foreign companies that provide cloud-based services, in addition to local companies that use these services. With regard to enforcement, healthcare providers that violate certain provisions of the Health Data Protection Law may face fines ranging from 1,000 to 1 million dirhams, effective from May 2019. Although the legislation has the clear intent of enforcement, it is not clear whether the MOHP and relevant authorities will take immediate action.

Pricing and reimbursement

Pricing of medication is fixed and regulated by applicable laws, with specified margin limits. Hospitals and clinics must sell medication to the public at the prices specified by the MOHP and cannot give discounts on medication outside the margins fixed by law. Bonus schemes between manufacturers and distributors are strongly discouraged (if not prohibited by law).

Since 2010, and under the direction of Abu Dhabi, the UAE has been moving towards a diagnostic rate group (DRG) system for insurance billing and reimbursement. One of the intended purposes of switching to the DRG system is to lower medical costs in the UAE (where the vast majority of medication is imported).

The DRG system requires new billing systems within hospitals and clinics, and the requisite staff training for documenting and coding applicable medical services. One potential benefit of the installation and implementation of the DRG system UAE-wide is providing transparency and avoiding excess payments or overbilling.

Administrative and judicial remedies

The UAE Medical Liability Law (UAE Federal Law No. 4 of 2016 read together with the implementing regulation of 2019) gives patients the right to report any form of medical malpractice or medical negligence by their service providers or by pharmaceutical companies directly to the MOHP, or its applicable departments. The complaints are to be referred to medical liability commissions, formed by the MOHP, or the chairman of the local health authority.

The relevant commission will review the complaint with all the applicable documentation and make an adjudication on the existence of malpractice and, if applicable, the causes and results of that malpractice.

The decisions made by the commissions are appealable by the patients, doctors or providers within 30 days to a higher liability commission, formed by the UAE Cabinet. After review of the file, the decisions of this higher commission are final and binding upon all parties.

Financial relationships with prescribers and payers

The Emirates of Abu Dhabi and Dubai have instituted mandatory health insurance schemes upon all employers. Additionally, the Department of Health Abu Dhabi (DOH) introduced a standard provider contract mandating that all contracts between insurers and providers meet required standards. One such requirement is that reimbursement of healthcare fees is made in accordance with a mandatory tariff, which specifies the price for basic services. Ideally, such requirement is an attempt to discourage or stop commissions or kickbacks between providers.

The DOH previously issued a directive relating to kickbacks in medical laboratory services and testing. This directive was the result of complaints from patients who were often directed to a medical laboratory that a specific doctor had an agreement with, to be billed for examinations, diagnostics or treatments that were unnecessary. The doctor was given a portion of any fees generated from such visits.

Additionally, local insurers have recently taken a novel approach in requiring that providers sign an undertaking letter to the effect that providers would comply with the spirit and letter of contractual requirements of their binding contract, with a sworn statement that no volume incentives or commissions are being paid for obtaining services. Violation of the undertaking letter could result not only in a material breach of the underlying contract justifying termination, but would allow the insurer to petition the DOH or another concerned governmental authority for redress.

Efforts to stem the flow of kickbacks are much more likely to have a significant impact on smaller secondary care providers (e.g., medical laboratory service providers or specialist diagnostic centres) that generate much of their revenue from larger hospitals or clinics. One way to ensure referrals is the payment of kickbacks. If kickbacks are no longer available through this route, companies will need to become more competitive.

The DRG billing system (as discussed in Section III) may be a further tool in the future to combat kickbacks and illegal commissions.

Special liability or compensation systems

Other than the remedies delineated in Section IV, there are no special liability or compensation systems contemplated in applicable law.

Transactional and competition issues

UAE Federal Law No. 4 of 2012 on the regulation of competition (the Competition Law) became effective in 2013 and regulates competition within the UAE market. The production and distribution of pharmaceuticals are specifically exempted from the Competition Law. Further, as stated elsewhere, the pricing of medication and pharmaceuticals is fixed by UAE law.

With respect to the sale of pharmaceutical manufacturing plants, companies or patents in the UAE, generally, these would follow the rules and requirements contained in the UAE Commercial Companies Law or Commercial Transactions Law. Approval of the relevant health department (DOH or DHA) or the Ministry of Health may be required depending on the specific activity on the licence of the company.

With respect to patent licensing, a patent licence cannot be transferred to a third party unless ownership of the licensed item has been assigned and approved by the respective court.

Current developments

Many of the legal and regulatory reforms contemplated herein strongly convey the desire of the UAE to be at the forefront of medical care. The ultimate objective of the UAE (the Emirates of Abu Dhabi and Dubai in particular) is to be able to manufacture or provide medication and healthcare that rivals that of any country around the world. This also includes a renewed focus on research and development and attracting qualified medical professionals and researchers.

During the past few years, the UAE has ramped up its investment strategy in the pharmaceutical industry. The UAE has witnessed significant deals in terms of mergers, acquisition and strategic tie-ups between healthcare stakeholders and public and private entities to enhance the healthcare industry in the recent years. The UAE pharmaceutical sector is expanding rapidly and is expected to reach almost 11.1 million by 2030, according to the World Bank. The Dubai Industrial Strategy 2030 and the Abu Dhabi vision 2030 consider the pharmaceutical industry as one of the main sub-sectors to develop with its future growth prospects, export potential and mid-term to long-term economic impact. This augmented investment strategy is propelled to focus on one of the significant national agenda items (i.e., to achieve a world-class healthcare system in the UAE and reduce reliance on imported pharmaceuticals and manufacture locally).

Outlook

Here is the original post:
In review: the life sciences regulatory regime in United Arab Emirates - Lexology

Targeting p53 pathways: mechanisms, structures, and advances in … – Nature.com

Kastenhuber, E. R. & Lowe, S. W. Putting p53 in context. Cell 170, 10621078 (2017).

Article CAS PubMed PubMed Central Google Scholar

Levine, A. J. p53: 800 million years of evolution and 40 years of discovery. Nat. Rev. Cancer 20, 471480 (2020).

Article CAS PubMed Google Scholar

ICGC/TCGA Pan-Cancer Analysis of Whole Genomes Consortium. Pan-cancer analysis of whole genomes. Nature. 578, 8293 (2020).

Lawrence, M. S. et al. Discovery and saturation analysis of cancer genes across 21 tumour types. Nature 505, 495501 (2014).

Article CAS PubMed PubMed Central Google Scholar

Bykov, V. J. N., Eriksson, S. E., Bianchi, J. & Wiman, K. G. Targeting mutant p53 for efficient cancer therapy. Nat. Rev. Cancer. 18, 89102 (2018).

Article CAS PubMed Google Scholar

Sullivan, K. D., Galbraith, M. D., Andrysik, Z. & Espinosa, J. M. Mechanisms of transcriptional regulation by p53. Cell Death Differ. 25, 133143 (2018).

Article CAS PubMed Google Scholar

Sager, R. Tumor suppressor genes: the puzzle and the promise. Science 246, 14061412 (1989).

Article CAS PubMed Google Scholar

Muller, P. A. J. & Vousden, K. H. p53 mutations in cancer. Nat. Cell Biol. 15, 28 (2013).

Article CAS PubMed Google Scholar

Meek, D. W. Tumour suppression by p53: a role for the DNA damage response? Nat. Rev. Cancer 9, 714723 (2009).

Article CAS PubMed Google Scholar

Wong, K. B. et al. Hot-spot mutants of p53 core domain evince characteristic local structural changes. Proc. Natl. Acad. Sci. USA 96, 84388442 (1999).

Article CAS PubMed PubMed Central Google Scholar

Kitayner, M. et al. Structural basis of DNA recognition by p53 tetramers. Mol. Cell 22, 741753 (2006).

Article CAS PubMed Google Scholar

Joerger, A. C. & Fersht, A. R. Structural biology of the tumor suppressor p53 and cancer-associated mutants. Adv. Cancer Res. 97, 123 (2007).

Article CAS PubMed Google Scholar

Loh, S. N. Arsenic and an old place: rescuing p53 mutants in cancer. Cancer Cell 39, 140142 (2021).

Article CAS PubMed Google Scholar

Linzer, D. I. & Levine, A. J. Characterization of a 54K dalton cellular SV40 tumor antigen present in SV40-transformed cells and uninfected embryonal carcinoma cells. Cell 17, 4352 (1979).

Article CAS PubMed Google Scholar

Lane, D. P. & Crawford, L. V. T antigen is bound to a host protein in SV40-transformed cells. Nature 278, 261263 (1979).

Article CAS PubMed Google Scholar

Parada, L. F. et al. Cooperation between gene encoding p53 tumour antigen and ras in cellular transformation. Nature 312, 649651 (1984).

Article CAS PubMed Google Scholar

Eliyahu, D., Michalovitz, D. & Oren, M. Overproduction of p53 antigen makes established cells highly tumorigenic. Nature 316, 158160 (1985).

Article CAS PubMed Google Scholar

Lane, D. P. & Benchimol, S. p53: oncogene or anti-oncogene? Genes Dev. 4, 18 (1990).

Article CAS PubMed Google Scholar

Nigro, J. M. et al. Mutations in the p53 gene occur in diverse human tumour types. Nature 342, 705708 (1989).

Article CAS PubMed Google Scholar

Cunningham, J. et al. Expression of p53 and 17p allelic loss in colorectal carcinoma. Cancer Res 52, 19741980 (1992).

CAS PubMed Google Scholar

Hinds, P., Finlay, C. & Levine, A. J. Mutation is required to activate the p53 gene for cooperation with the ras oncogene and transformation. J. Virol. 63, 739746 (1989).

Article CAS PubMed PubMed Central Google Scholar

Eliyahu, D. et al. Meth A fibrosarcoma cells express two transforming mutant p53 species. Oncogene 3, 313321 (1988).

CAS PubMed Google Scholar

Donehower, L. A. et al. Mice deficient for p53 are developmentally normal but susceptible to spontaneous tumours. Nature 356, 215221 (1992).

Article CAS PubMed Google Scholar

Olivero, C. E. et al. p53 Activates the Long Noncoding RNA Pvt1b to Inhibit Myc and Suppress Tumorigenesis. Mol. Cell. 77, 761774 (2020).

Article CAS PubMed PubMed Central Google Scholar

Yonish-Rouach, E. et al. The role of p53 as a transcription factor in the induction of apoptosis. Behring Inst. Mitt. 97, 6071 (1996).

CAS Google Scholar

Wei, C.-L. et al. A global map of p53 transcription-factor binding sites in the human genome. Cell 124, 207219 (2006).

Article CAS PubMed Google Scholar

Bieging, K. T., Mello, S. S. & Attardi, L. D. Unravelling mechanisms of p53-mediated tumour suppression. Nat. Rev. Cancer 14, 359370 (2014).

Article CAS PubMed PubMed Central Google Scholar

Lakin, N. & Jackson, S. Regulation of p53 in response to DNA damage. Oncogene 18, 76447655 (1999).

Article CAS PubMed Google Scholar

Gu, B. & Zhu, W. Surf the post-translational modification network of p53 regulation. Int. J. Biol. Sci. 8, 672684 (2012).

Article PubMed PubMed Central Google Scholar

DeHart, C., Chahal, J., Flint, S. & Perlman, D. Extensive post-translational modification of active and inactivated forms of endogenous p53. Mol. Cell Proteom. 13, 117 (2014).

Article CAS Google Scholar

Chen, L., Liu, S. & Tao, Y. Regulating tumor suppressor genes: post-translational modifications. Signal Transduct. Target Ther. 5, 90 (2020).

Article CAS PubMed PubMed Central Google Scholar

Kruse, J.-P. & Gu, W. SnapShot: p53 posttranslational modifications. Cell 133, 93030 (2008).

Article CAS PubMed PubMed Central Google Scholar

Aubrey, B. et al. How does p53 induce apoptosis and how does this relate to p53-mediated tumour suppression? Cell Death Differ. 25, 104113 (2018).

Article CAS PubMed Google Scholar

Vaddavalli, P. & Schumacher, B. The p53 network: cellular and systemic DNA damage responses in cancer and aging. Trends Genet 38, 598612 (2022).

Article CAS PubMed Google Scholar

Ma, M. et al. p53 positively regulates the proliferation of hepatic progenitor cells promoted by laminin-521. Signal Transduct. Target Ther. 7, 290 (2022).

Article CAS PubMed PubMed Central Google Scholar

Mihara, M. et al. p53 has a direct apoptogenic role at the mitochondria. Mol. Cell. 11, 577590 (2003).

Article CAS PubMed Google Scholar

Chipuk, J. E. et al. Direct activation of Bax by p53 mediates mitochondrial membrane permeabilization and apoptosis. Science 303, 10101014 (2004).

Article CAS PubMed Google Scholar

Miyashita, T. & Reed, J. C. Tumor suppressor p53 is a direct transcriptional activator of the human bax gene. Cell 80, 293299 (1995).

Article CAS PubMed Google Scholar

Seoane, J., Le, H.-V. & Massagu, J. Myc suppression of the p21(Cip1) Cdk inhibitor influences the outcome of the p53 response to DNA damage. Nature 419, 729734 (2002).

Article CAS PubMed Google Scholar

Engeland, K. Cell cycle regulation: p53-p21-RB signaling. Cell Death Differ. 29, 946960 (2022).

Article CAS PubMed PubMed Central Google Scholar

Hafner, A., Bulyk, M., Jambhekar, A. & Lahav, G. The multiple mechanisms that regulate p53 activity and cell fate. Nat. Rev. Mol. Cell Biol. 20, 199210 (2019).

Article CAS PubMed Google Scholar

Sherr, C. J. & McCormick, F. The RB and p53 pathways in cancer. Cancer Cell 2, 103112 (2002).

Article CAS PubMed Google Scholar

Sancar, A. DNA repair in humans. Annu. Rev. Genet. 29, 69105 (1995).

Article CAS PubMed Google Scholar

Sancar, A., Lindsey-Boltz, L. A., Unsal-Kamaz, K. & Linn, S. Molecular mechanisms of mammalian DNA repair and the DNA damage checkpoints. Annu. Rev. Biochem. 73, 3985 (2004).

Article CAS PubMed Google Scholar

Jiang, L. et al. Ferroptosis as a p53-mediated activity during tumour suppression. Nature 520, 5762 (2015).

Article CAS PubMed PubMed Central Google Scholar

Liu, Y. & Gu, W. The complexity of p53-mediated metabolic regulation in tumor suppression. Semin. Cancer Biol. 85, 432 (2021).

Article PubMed Google Scholar

Blagih, J., Buck, M. D. & Vousden, K. H. p53, cancer and the immune response. J. Cell Sci. 133, jcs237453 (2020).

Article CAS PubMed Google Scholar

Spike, B. T. & Wahl, G. M. p53, stem cells, and reprogramming: tumor suppression beyond guarding the genome. Genes Cancer 2, 404419 (2011).

Article CAS PubMed PubMed Central Google Scholar

White, E. Autophagy and p53. Cold Spring Harb. Perspect. Med. 6, a026120 (2016).

Article PubMed PubMed Central Google Scholar

Mrakovcic, M. & Frhlich, L. p53-mediated molecular control of autophagy in tumor cells. Biomolecules 8, 14 (2018).

Article PubMed PubMed Central Google Scholar

Williams, A. B. & Schumacher, B. p53 in the DNA-damage-repair process. Cold Spring Harb. Perspect. Med. 6, a026070 (2016).

Original post:
Targeting p53 pathways: mechanisms, structures, and advances in ... - Nature.com

Kanazawa University research: Biomolecular sliding at the nanoscale – StreetInsider.com

KANAZAWA, Japan, Feb. 28, 2023 /PRNewswire/ -- Researchers at Kanazawa University report in Nano Letters the discovery of a biomolecular dynamical process likely relevant to gene expression. The process, revealed by means of high-speed atomic force microscopy, involves DNA and its packaging molecules.

In organisms whose cells have a nucleus, like plants and animals, the basic packaging units of DNA are the so-called nucleosomes. A nucleosome consists of a segment of DNA wound around eight proteins known as histones. Gene expression, which lies at the basis of protein production, requires 'reading' DNA, for which DNA needs to be temporarily unwrapped. Detailed studies, and especially visualizations, of DNAhistone and nucleosome dynamics are crucial for better understanding DNA unwrapping and related processes. Mikihiro Shibata from Kanazawa University and colleagues have now succeeded in making video recordings of the nucleosome dynamics of H2A.Z, a histone variant associated with various biological processes. The videos reveal the spontaneous sliding of H2A.Z nucleosomes on a substrate.

Histone variants, such as H2A.Z, differ from the canonical forms (like H2A) encountered in stable nucleosome packaging. They form unstable nucleosomes with particular biological functions; H2A.Z is believed to play a role in early embryonic development and stem cell differentiation. The dynamics of the H2A.Z nucleosome under physiological conditions are mostly unknown. Shibata and colleagues used high-speed atomic force microscopy (HS-AFM) to investigate H2A.Z nucleosome dynamics, as the method is a powerful nanoimaging tool for visualizing molecular structures and their dynamics at high spatiotemporal resolution.

To observe DNAhistone dynamics in HS-AFM experiments, the nucleosome needs to be put onto a substrate. The DNA should adsorb easily to the substrate, but at the same time, substrateDNA interactions should still be weak enough to avoid suppressing dynamical processes. The scientists therefore prepared substrates by putting pillar[5]arenes onto a mica surface. The pillar[5]arenes, molecules with a pentagonal tubular structure, form a thin film on the mica, and provide the ideal surface for nucleosome dynamics observations.

The researchers looked at the time evolution of a system consisting of a nucleosome particle put on a DNA strand. Experiments with canonical H2A histones confirmed the stability of H2A nucleosomes: no significant changes over time were observed. Observations for H2A.Z histone variants showed a different picture, however. HS-AFM with a time resolution of 0.3 s revealed sliding events, in which a nucleosome particle slides along the DNA strand.

The findings of Shibata and colleagues may lead to a better understanding of the biochemical mechanisms behind gene expression. Quoting the researchers: "[t]he single-molecule imaging by HS-AFM presented here could help unveil the relationship between nucleosome dynamics and gene regulation in the near future."

Background

High-speed atomic force microscopyThe general principle of atomic force microscopy (AFM) is to make a very small tip scan the surface of a sample. During this horizontal (xy) scan, the tip, which is attached to a small cantilever, follows the sample's vertical (z) profile, inducing a force on the cantilever that can be measured. The magnitude of the force at the xy position can be related to the z value; the xyz data generated during a scan then result in a height map providing structural information about the investigated sample. In high-speed-AFM (HS-AFM), the working principle is slightly more involved: the cantilever is made to oscillate near its resonance frequency. When the tip is moved around a surface, the variations in the amplitude (or the frequency) of the cantilever's oscillation resulting from the tip's interaction with the sample's surface are recorded, as these provide a measure for the local 'z' value. AFM does not involve lenses, so its resolution is not restricted by the so-called diffraction limit as in X-ray diffraction, for example.

HS-AFM results in a video, where the time interval between frames depends on the speed with which a single image can be generated (by xy-scanning the sample). Researchers at Kanazawa University have in recent years developed HS-AFM further, so that it can be applied to study biochemical molecules and biomolecular processes in real-time. Mikihiro Shibata and colleagues have now applied the method to study nucleosome dynamics, revealing a sliding process of nucleosome particles along a DNA strand.

Related figurehttps://nanolsi.kanazawa-u.ac.jp/wp-content/uploads/2023/02/H2AZ_thumbnail.png

Caption: High-speed atomic force microscopy visualization of the sliding of a H2A.Z nucleosome along a DNA strand. 2023 Morioka, et al., Nano Letters

Reference

Shin Morioka, Shoko Sato, Naoki Horikoshi, Tomoya Kujirai, Takuya Tomita, Yudai Baba, Takahiro Kakuta, Tomoki Ogoshi, Leonardo Puppulin, Ayumi Sumino, Kenichi Umeda, Noriyuki Kodera, Hitoshi Kurumizaka, and Mikihiro Shibata. High-Speed Atomic Force Microscopy Reveals Spontaneous Nucleosome Sliding of H2A.Z at the Subsecond Time Scale, Nano Letters (2023).

DOI: doi=10.1021/acs.nanolett.2c04346

https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.2c04346

ContactHiroe YonedaVice Director of Public AffairsWPI Nano Life Science Institute (WPI-NanoLSI)Kanazawa UniversityKakuma-machi, Kanazawa 920-1192, JapanEmail: [emailprotected]Tel: +81 (76) 234-4550

About Kanazawa Universityhttp://www.kanazawa-u.ac.jp/e/As the leading comprehensive university on the Sea of Japan coast, Kanazawa University has contributed greatly to higher education and academic research in Japan since it was founded in 1949. The University has three colleges and 17 schools offering courses in subjects that include medicine, computer engineering, and humanities.

The University is located on the coast of the Sea of Japan in Kanazawa a city rich in history and culture. The city of Kanazawa has a highly respected intellectual profile since the time of the fiefdom (1598-1867). Kanazawa University is divided into two main campuses: Kakuma and Takaramachi for its approximately 10,200 students including 600 from overseas.

View original content:https://www.prnewswire.com/news-releases/kanazawa-university-research-biomolecular-sliding-at-the-nanoscale-301757624.html

SOURCE Kanazawa University

Read the original here:
Kanazawa University research: Biomolecular sliding at the nanoscale - StreetInsider.com

Automating iPSC generation to enable autologous photoreceptor … – Journal of Translational Medicine

Starzl TE. The early days of transplantation. JAMA. 1994;272(21):1705.

Article CAS PubMed PubMed Central Google Scholar

Vanholder R, Dominguez-Gil B, Busic M, Cortez-Pinto H, Craig JC, Jager KJ, et al. Organ donation and transplantation: a multi-stakeholder call to action. Nat Rev Nephrol. 2021;17(8):55468.

Article PubMed PubMed Central Google Scholar

Aubert O, Yoo D, Zielinski D, Cozzi E, Cardillo M, Durr M, et al. COVID-19 pandemic and worldwide organ transplantation: a population-based study. Lancet Public Health. 2021;6(10):e709e19.

Article PubMed PubMed Central Google Scholar

Zhang Y, Klassen HJ, Tucker BA, Perez MT, Young MJ. CNS progenitor cells promote a permissive environment for neurite outgrowth via a matrix metalloproteinase-2-dependent mechanism. J Neurosci. 2007;27(17):4499506.

Article CAS PubMed PubMed Central Google Scholar

Luo J, Baranov P, Patel S, Ouyang H, Quach J, Wu F, et al. Human retinal progenitor cell transplantation preserves vision. J Biol Chem. 2014;289(10):636271.

Article CAS PubMed PubMed Central Google Scholar

Han IC, Bohrer LR, Gibson-Corley KN, Wiley LA, Shrestha A, Harman BE, et al. Biocompatibility of Human Induced Pluripotent Stem cell-derived retinal progenitor cell grafts in immunocompromised rats. Cell Transpl. 2022;31:9636897221104451.

Article Google Scholar

Tucker BA, Park IH, Qi SD, Klassen HJ, Jiang C, Yao J, et al. Transplantation of adult mouse iPS cell-derived photoreceptor precursors restores retinal structure and function in degenerative mice. PLoS ONE. 2011;6(4):e18992.

Article CAS PubMed PubMed Central Google Scholar

Mandai M, Fujii M, Hashiguchi T, Sunagawa GA, Ito SI, Sun J, et al. iPSC-Derived retina transplants improve vision in rd1 end-stage retinal-degeneration mice. Stem Cell Reports. 2017;8(1):6983.

Article PubMed PubMed Central Google Scholar

Lin B, McLelland BT, Aramant RB, Thomas BB, Nistor G, Keirstead HS, et al. Retina organoid transplants develop photoreceptors and improve visual function in RCS rats with RPE dysfunction. Invest Ophthalmol Vis Sci. 2020;61(11):34.

Article CAS PubMed PubMed Central Google Scholar

McLelland BT, Lin B, Mathur A, Aramant RB, Thomas BB, Nistor G, et al. Transplanted hESC-Derived retina organoid sheets differentiate, integrate, and improve visual function in retinal degenerate rats. Invest Ophthalmol Vis Sci. 2018;59(6):2586603.

Article CAS PubMed PubMed Central Google Scholar

Zerti D, Hilgen G, Dorgau B, Collin J, Ader M, Armstrong L, et al. Transplanted pluripotent stem cell-derived photoreceptor precursors elicit conventional and unusual light responses in mice with advanced retinal degeneration. Stem Cells. 2021;39(7):88296.

Article CAS PubMed Google Scholar

Santos-Ferreira T, Volkner M, Borsch O, Haas J, Cimalla P, Vasudevan P, et al. Stem cell-derived photoreceptor transplants differentially integrate into mouse models of cone-rod dystrophy. Invest Ophthalmol Vis Sci. 2016;57(7):350920.

Article CAS PubMed Google Scholar

Gagliardi G, Ben M, Barek K, Chaffiol A, Slembrouck-Brec A, Conart JB, Nanteau C, et al. Characterization and transplantation of CD73-Positive photoreceptors isolated from human iPSC-Derived retinal organoids. Stem Cell Reports. 2018;11(3):66580.

Article CAS PubMed PubMed Central Google Scholar

Chao JR, Lamba DA, Klesert TR, Torre A, Hoshino A, Taylor RJ, et al. Transplantation of human embryonic stem cell-derived retinal cells into the Subretinal Space of a non-human primate. Transl Vis Sci Technol. 2017;6(3):4.

Article PubMed PubMed Central Google Scholar

Zhu J, Cifuentes H, Reynolds J, Lamba DA. Immunosuppression via loss of IL2rgamma enhances long-term functional integration of hESC-Derived photoreceptors in the mouse retina. Cell Stem Cell. 2017;20(3):37484. e5.

Article CAS PubMed Google Scholar

Lamba DA, McUsic A, Hirata RK, Wang PR, Russell D, Reh TA. Generation, purification and transplantation of photoreceptors derived from human induced pluripotent stem cells. PLoS ONE. 2010;5(1):e8763.

Article PubMed PubMed Central Google Scholar

Lamba DA, Gust J, Reh TA. Transplantation of human embryonic stem cell-derived photoreceptors restores some visual function in crx-deficient mice. Cell Stem Cell. 2009;4(1):739.

Article CAS PubMed PubMed Central Google Scholar

Lingam S, Liu Z, Yang B, Wong W, Parikh BH, Ong JY, et al. cGMP-grade human iPSC-derived retinal photoreceptor precursor cells rescue cone photoreceptor damage in non-human primates. Stem Cell Res Ther. 2021;12(1):464.

Article CAS PubMed PubMed Central Google Scholar

Aboualizadeh E, Phillips MJ, McGregor JE, DiLoreto DA Jr, Strazzeri JM, Dhakal KR, et al. Imaging transplanted photoreceptors in living Nonhuman Primates with single-cell resolution. Stem Cell Reports. 2020;15(2):48297.

Article CAS PubMed PubMed Central Google Scholar

Kruczek K, Gonzalez-Cordero A, Goh D, Naeem A, Jonikas M, Blackford SJI, et al. Differentiation and transplantation of embryonic stem cell-derived cone photoreceptors into a mouse model of end-stage retinal degeneration. Stem Cell Reports. 2017;8(6):165974.

Article CAS PubMed PubMed Central Google Scholar

Gonzalez-Cordero A, West EL, Pearson RA, Duran Y, Carvalho LS, Chu CJ, et al. Photoreceptor precursors derived from three-dimensional embryonic stem cell cultures integrate and mature within adult degenerate retina. Nat Biotechnol. 2013;31(8):7417.

Article CAS PubMed Google Scholar

Ballios BG, Cooke MJ, Donaldson L, Coles BL, Morshead CM, van der Kooy D, et al. A Hyaluronan-Based Injectable Hydrogel improves the survival and integration of stem cell progeny following transplantation. Stem Cell Reports. 2015;4(6):103145.

Article CAS PubMed PubMed Central Google Scholar

Klassen H, Sakaguchi DS, Young MJ. Stem cells and retinal repair. Prog Retin Eye Res. 2004;23(2):14981.

Article CAS PubMed Google Scholar

Eberle D, Santos-Ferreira T, Grahl S, Ader M. Subretinal transplantation of MACS purified photoreceptor precursor cells into the adult mouse retina.J Vis Exp. 2014(84):e50932.

Lakowski J, Gonzalez-Cordero A, West EL, Han YT, Welby E, Naeem A, et al. Transplantation of photoreceptor precursors isolated via a cell surface Biomarker Panel from embryonic stem cell-derived self-forming retina. Stem Cells. 2015;33(8):246982.

Article CAS PubMed Google Scholar

Semo M, Haamedi N, Stevanato L, Carter D, Brooke G, Young M, et al. Efficacy and safety of human retinal progenitor cells. Transl Vis Sci Technol. 2016;5(4):6.

Article PubMed PubMed Central Google Scholar

Aftab U, Jiang C, Tucker B, Kim JY, Klassen H, Miljan E, et al. Growth kinetics and transplantation of human retinal progenitor cells. Exp Eye Res. 2009;89(3):30110.

Article CAS PubMed Google Scholar

Meyer JS, Shearer RL, Capowski EE, Wright LS, Wallace KA, McMillan EL, et al. Modeling early retinal development with human embryonic and induced pluripotent stem cells. Proc Natl Acad Sci U S A. 2009;106(39):16698703.

Article CAS PubMed PubMed Central Google Scholar

Meyer JS, Howden SE, Wallace KA, Verhoeven AD, Wright LS, Capowski EE, et al. Optic vesicle-like structures derived from human pluripotent stem cells facilitate a customized approach to retinal disease treatment. Stem Cells. 2011;29(8):120618.

Article CAS PubMed Google Scholar

Nakano T, Ando S, Takata N, Kawada M, Muguruma K, Sekiguchi K, et al. Self-formation of optic cups and storable stratified neural retina from human ESCs. Cell Stem Cell. 2012;10(6):77185.

Article CAS PubMed Google Scholar

Capowski EE, Samimi K, Mayerl SJ, Phillips MJ, Pinilla I, Howden SE, et al. Reproducibility and staging of 3D human retinal organoids across multiple pluripotent stem cell lines. Development. 2019. https://doi.org/10.1242/dev.171686.

Article PubMed PubMed Central Google Scholar

Phillips MJ, Perez ET, Martin JM, Reshel ST, Wallace KA, Capowski EE, et al. Modeling human retinal development with patient-specific induced pluripotent stem cells reveals multiple roles for visual system homeobox 2. Stem Cells. 2014;32(6):148092.

Article CAS PubMed Google Scholar

Wiley LA, Burnight ER, DeLuca AP, Anfinson KR, Cranston CM, Kaalberg EE, et al. cGMP production of patient-specific iPSCs and photoreceptor precursor cells to treat retinal degenerative blindness. Sci Rep. 2016;6:30742.

Article CAS PubMed PubMed Central Google Scholar

Reichman S, Terray A, Slembrouck A, Nanteau C, Orieux G, Habeler W, et al. From confluent human iPS cells to self-forming neural retina and retinal pigmented epithelium. Proc Natl Acad Sci U S A. 2014;111(23):851823.

Article CAS PubMed PubMed Central Google Scholar

Zhong X, Gutierrez C, Xue T, Hampton C, Vergara MN, Cao LH, et al. Generation of three-dimensional retinal tissue with functional photoreceptors from human iPSCs. Nat Commun. 2014;5:4047.

Article CAS PubMed Google Scholar

Kuwahara A, Ozone C, Nakano T, Saito K, Eiraku M, Sasai Y. Generation of a ciliary margin-like stem cell niche from self-organizing human retinal tissue. Nat Commun. 2015;6:6286.

Article CAS PubMed Google Scholar

Mellough CB, Collin J, Khazim M, White K, Sernagor E, Steel DH, et al. IGF-1 signaling plays an important role in the formation of Three-Dimensional laminated neural retina and other ocular structures from human embryonic stem cells. Stem Cells. 2015;33(8):241630.

Article PubMed Google Scholar

Singh RK, Mallela RK, Cornuet PK, Reifler AN, Chervenak AP, West MD, et al. Characterization of three-dimensional retinal tissue derived from human embryonic stem cells in adherent monolayer cultures. Stem Cells Dev. 2015;24(23):277895.

Article CAS PubMed PubMed Central Google Scholar

Lowe A, Harris R, Bhansali P, Cvekl A, Liu W. Intercellular adhesion-dependent cell survival and ROCK-Regulated actomyosin-driven forces mediate self-formation of a retinal organoid. Stem Cell Reports. 2016;6(5):74356.

Article CAS PubMed PubMed Central Google Scholar

Gonzalez-Cordero A, Kruczek K, Naeem A, Fernando M, Kloc M, Ribeiro J, et al. Recapitulation of human Retinal Development from Human pluripotent stem cells generates transplantable populations of cone photoreceptors. Stem Cell Reports. 2017;9(3):82037.

Article PubMed PubMed Central Google Scholar

Wahlin KJ, Maruotti JA, Sripathi SR, Ball J, Angueyra JM, Kim C, et al. Photoreceptor outer segment-like structures in long-term 3D retinas from human pluripotent stem cells. Sci Rep. 2017;7(1):766.

Article PubMed PubMed Central Google Scholar

Ovando-Roche P, West EL, Branch MJ, Sampson RD, Fernando M, Munro P, et al. Use of bioreactors for culturing human retinal organoids improves photoreceptor yields. Stem Cell Res Ther. 2018;9(1):156.

Article CAS PubMed PubMed Central Google Scholar

Hallam D, Hilgen G, Dorgau B, Zhu L, Yu M, Bojic S, et al. Human-Induced pluripotent stem cells generate light responsive retinal organoids with variable and nutrient-dependent efficiency. Stem Cells. 2018;36(10):153551.

Article CAS PubMed Google Scholar

Luo Z, Zhong X, Li K, Xie B, Liu Y, Ye M, et al. An optimized system for effective derivation of three-dimensional retinal tissue via wnt signaling regulation. Stem Cells. 2018;36(11):170922.

Article CAS PubMed Google Scholar

NIH human embryonic stem cell registry. https://grants.nih.gov/stem_cells/registry/current.htm. Accessed 27 Feb 2023.

Guha P, Morgan JW, Mostoslavsky G, Rodrigues NP, Boyd AS. Lack of immune response to differentiated cells derived from syngeneic induced pluripotent stem cells. Cell Stem Cell. 2013;12(4):40712.

Article CAS PubMed Google Scholar

Singh VK, Kalsan M, Kumar N, Saini A, Chandra R. Induced pluripotent stem cells: applications in regenerative medicine, disease modeling, and drug discovery. Front Cell Dev Biol. 2015;3:2.

Article PubMed PubMed Central Google Scholar

Mantripragada VP, Luangphakdy V, Hittle B, Powell K, Muschler GF. Automated in-process characterization and selection of cell-clones for quality and efficient cell manufacturing. Cytotechnology. 2020;72(5):61527.

Article CAS PubMed PubMed Central Google Scholar

Wiley LA, Anfinson KR, Cranston CM, Kaalberg EE, Collins MM, Mullins RF, et al. Generation of Xeno-Free, cGMP-compliant patient-specific iPSCs from skin biopsy. Curr Protoc Stem Cell Biol. 2017. https://doi.org/10.1002/cpsc.30.

Article PubMed PubMed Central Google Scholar

Bohrer LR, Wiley LA, Burnight ER, Cooke JA, Giacalone JC, Anfinson KR, et al. Correction of NR2E3 associated enhanced s-cone syndrome patient-specific iPSCs using CRISPR-Cas9. Genes (Basel). 2019. https://doi.org/10.3390/genes10040278.

Article PubMed PubMed Central Google Scholar

Hao Y, Hao S, Andersen-Nissen E, Mauck WM, Zheng S, Butler A, et al. Integrated analysis of multimodal single-cell data. Cell. 2021;184(13):3573-87e29.

Article CAS PubMed PubMed Central Google Scholar

Continued here:
Automating iPSC generation to enable autologous photoreceptor ... - Journal of Translational Medicine

Hair Transplant Global Market Report 2023: Increasing use of Follicular Unit Extraction Drives Growth – Yahoo Finance

Company Logo

Global Hair Transplant Market

Global Hair Transplant Market

Dublin, March 02, 2023 (GLOBE NEWSWIRE) -- The "Hair Transplant Market, Size, Forecast 2023-2028, Industry Trends, Growth, Share, Outlook, Impact of Inflation, Opportunity Company Analysis" report has been added to ResearchAndMarkets.com's offering.

Global Hair Transplant Market is expected to reach US$ 53.17 Billion by 2028, according to the publisher. The hair transplant industry is a developing and a attractive sector, driven by rising demand for cosmetic surgeries to enhance looks and self-esteem. Advances in surgical procedures and instruments, as well as increased public knowledge of the process, have all contributed to the industry's expansion in recent years.

For example, the International Society of Hair Restoration Surgery (ISHRS) predicts that 2,221,191 hair restoration treatments would be conducted worldwide in 2021, with hair restoration procedures increasing by 7% globally between 2019 and 2021.

Hair Transplant Growth Trends appears to grow with a double-digit CAGR of 23.84% during 2022-2028

The increasing frequency of chronic diseases like cancer, hyperthyroidism, and hypothyroidism causes hair loss, which drives market expansion. Increased usage of chemotherapies, which causes hair loss and increases demand for hair transplant surgery. The market is growing because to an increase in the number of product approvals and product launches for hair transplantation procedures.

However, the sector confronts a number of obstacles, including a lack of standardization and regulation, as well as the possibility of substandard outcomes from unskilled or unlicensed practitioners. As a result, patients considering hair transplant surgeries should do their homework and select a trained and recognized surgeon to achieve the best potential results. For the year 2022, Hair Restoration Market World over was worth US$ 17.75 Billion.

Increasing Surgeries at Hospitals and Clinics to Aid Market Share

Hair transplants can be done in a variety of settings, including hospitals, clinics, surgical centres, and other facilities. Clinics that perform hair transplant surgeries may also provide additional hair loss therapies such as topical and oral medicines, laser therapy, and scalp micropigmentation. Patients must conduct research and select a reputed and competent clinic for their hair transplant process. Look for clinics that have a trained medical staff, employ established treatments, and have a track record of favourable results.

Overall, the hair transplant market in Clinics is expanding, fueled by rising demand for hair restoration surgeries and technological developments. For example, HHC (Hermest Hair Clinic) established a cost-effective and innovative follicular unit extraction (FUE) technique service for hair transplants in Turkey in April 2022. Such innovations are expected to drive market expansion over the study period.

Hair transplant treatments are often conducted in hospitals as part of a bigger medical centre that provides a full range of medical services and resources. Emergency services are frequently offered in hospitals, which can give an additional degree of protection for individuals having hair transplant surgeries. The hospitals segment is predicted to grow significantly during the hair transplant market projection period, owing to the availability of various hair transplant procedures and an increase in government investment to strengthen the healthcare sector.

The Increasing use of Follicular Unit Extraction (FUE) will Drive Market Growth

To restore hair in bald areas, several hair transplantation techniques such as follicular unit transplantation (FUT) and follicular unit extraction (FUE) are undertaken. Hair transplantation is most typically used to treat male pattern baldness, but it can also be used to treat female hair loss and balding. FUE is a popular hair restoration method because it has numerous advantages over traditional hair transplant procedures, such as less invasiveness, more natural-looking outcomes, a quicker recovery period, and a high degree of customisation. These elements are propelling FUE's popularity and ensuring its continuing expansion as a hair restoration procedure.

For many years, FUT has been a popular hair restoration method, and it remains a viable alternative for people seeking hair restoration. FUT is a well-established hair restoration procedure that is anticipated to flourish and grow in popularity in the next years, especially as technology advances and people become more aware of their alternatives. However, it is critical to select a trained and experienced practitioner for any hair restoration surgery, as the outcomes might vary widely depending on the practitioner's abilities and knowledge.

The Growing Number of Persons Experiencing Hair Loss will have an Impact on Regional Growth

North America, Europe, and Asia Pacific are among the most populous and fastest-growing markets for hair transplant treatments, owing to reasons such as ageing populations, rising disposable incomes, and increased knowledge of the process. Hair transplant market growth is being driven by an increase in the number of operations performed in the United States. According to the American Society of Plastic Surgery (ASPS), 24,348 hair transplantation surgeries were conducted in the United States in 2019.

Furthermore, a growth in physical appearance awareness among Europeans, as well as an increase in the number of people suffering from baldness, increases the need for hair transplant procedures. According to the New Look Institute, a hair restoration facility, in 2021, around 39.24% of the male population in France will be bald.

Emerging Asian countries are focusing on the development of superior healthcare facilities while reducing prices and medical tourism. Istanbul has become the Global Hair Transplant Capital. Turkish health institutions and physicians specialized in this topic have become a global phenomenon in recent years.

During the Projection Period, Platelet Rich Plasma Treatment is Predicted to Increase at a Faster CAGR

The market is divided into three segments based on therapy: low level laser therapy, stem cell hair restoration, and platelet rich plasma. Platelet-rich plasma therapy techniques in hair loss treatment are rapidly expanding, which is projected to enhance demand for platelet-rich plasma (PRP) therapy. Due to its non-surgical and minimally invasive nature, Platelet Rich Plasma (PRP) therapy for hair loss has grown in popularity in recent years. Rising popularity and efficacy of PRP therapy is projected to recover with minimum scarring following transplantation, leading in increased demand for platelet-rich plasma therapy throughout the projection period.

Stem cell hair restoration treatment is a novel and rapidly developing topic in the hair transplant business. Despite these emerging trends, stem cell hair restoration therapy is still in its infancy, and more study is required to properly understand its efficacy and long-term effects. Furthermore, not all clinics offering stem cell hair restoration therapy have the requisite experience and technology, so selecting a recognised and competent facility for treatment is critical.

Drug Product holds Majority of the Market Share

The hair transplant market is divided into gel, serum, medicines, multivitamins, and others based on product. The medication hair transplant market is continually growing, with new products and treatments being created on a regular basis. Minoxidil and finasteride are two regularly used drugs for the treatment of hair loss. Minoxidil is a topical drug that is readily accessible without a prescription and is used to treat both male and female pattern baldness. Finasteride is an oral medicine that is mostly used to treat male pattern baldness. It is taken on a daily basis and has been proved to be useful in certain men in reducing or preventing hair loss and encouraging hair growth.

Procedure - Hair Transplant Market breakup from 2 viewpoints:

1. Follicular Unit Extraction (FUE)2. Follicular Unit Transplantation (FUT)

Therapy - Hair Transplant Market breakup from 3 viewpoints:

1. Platelet Rich Plasma2. Stem Cell Therapy3. Laser Therapy

Product - Hair Transplant Market breakup from 5 viewpoints:

1. Gel2. Serum3. Hair Transplant4. Multivitamins5. Others

Region - Hair Transplant Market breakup from 5 viewpoints:

1. North America2. Europe3. Asia-Pacific4. Latin America5. Middle East & Africa

Service Provider - Hair Transplant Market breakup from 4 viewpoints:

1. Clinics2. Surgical Centers3. Hospitals4. Others

Story continues

Report Attribute

Details

No. of Pages

130

Forecast Period

2022 - 2028

Estimated Market Value (USD) in 2022

$14.74 Billion

Forecasted Market Value (USD) by 2028

$53.17 Billion

Compound Annual Growth Rate

23.8%

Regions Covered

Global

Companies Mentioned

Venus Concept Inc

Sisram Medical Ltd

CUTERA, INC

Allergan Plc

For more information about this report visit https://www.researchandmarkets.com/r/bex3hs-transplant?w=12

About ResearchAndMarkets.comResearchAndMarkets.com is the world's leading source for international market research reports and market data. We provide you with the latest data on international and regional markets, key industries, the top companies, new products and the latest trends.

Attachment

Link:
Hair Transplant Global Market Report 2023: Increasing use of Follicular Unit Extraction Drives Growth - Yahoo Finance

Metabolic Mechanism Activates Stem Cells in the Adult Brain – Technology Networks

Register for FREE to listen to this article

Thank you. Listen to this article using the player above.

Want to listen to this article for FREE?

Complete the form below to unlock access to ALL audio articles.

A team of biologists led by UNIGE and UNIL has discovered how to awaken neural stem cells and reactivate them in adult mice.

Some areas of the adult brain contain quiescent, or dormant, neural stem cells that can potentially be reactivated to form new neurons. However, the transition from quiescence to proliferation is still poorly understood. A team led by scientists from the Universities of Geneva (UNIGE) and Lausanne (UNIL) has discovered the importance of cell metabolism in this process and identified how to wake up these neural stem cells and reactivate them. Biologists succeeded in increasing the number of new neurons in the brain of adult and even elderly mice. These results, promising for the treatment of neurodegenerative diseases, are to be discovered in the journalScience Advances.

Stem cells have the unique ability to continuously produce copies of themselves and give rise to differentiated cells with more specialized functions. Neural stem cells (NSCs) are responsible for building the brain during embryonic development, generating all the cells of the central nervous system, including neurons.

Surprisingly, NSCs persist in certain brain regions even after the brain is fully formed and can make new neurons throughout life. This biological phenomenon, called adult neurogenesis, is important for specific functions such as learning and memory processes. However, in the adult brain, these stem cells become more silent or dormant and reduce their capacity for renewal and differentiation. As a result, neurogenesis decreases significantly with age. The laboratories of Jean-Claude Martinou, Emeritus Professor in the Department of Molecular and Cellular Biology at the UNIGE Faculty of Science, and Marlen Knobloch, Associate Professor in the Department of Biomedical Sciences at the UNIL Faculty of Biology and Medicine, have uncovered a metabolic mechanism by which adult NSCs can emerge from their dormant state and become active.

We found that mitochondria, the energy-producing organelles within cells, are involved in regulating the level of activation of adult NSCs,explains Francesco Petrelli, research fellow at UNIL and co-first author of the study with Valentina Scandella. The mitochondrial pyruvate transporter (MPC), a protein complex discovered eleven years ago in Professor Martinous group, plays a particular role in this regulation. Its activity influences the metabolic options a cell can use. By knowing the metabolic pathways that distinguish active cells from dormant cells, scientists can wake up dormant cells by modifying their mitochondrial metabolism.

Biologists have blocked MPC activity by using chemical inhibitors or by generating mutant mice for theMpc1gene. Using these pharmacological and genetic approaches, the scientists were able to activate dormant NSCs and thus generate new neurons in the brains of adult and even aged mice. With this work, we show that redirection of metabolic pathways can directly influence the activity state of adult NSCs and consequently the number of new neurons generated, summarizes Professor Knobloch, co-lead author of the study. These results shed new light on the role of cell metabolism in the regulation of neurogenesis. In the long term, these results could lead to potential treatments for conditions such as depression or neurodegenerative diseases, concludes Jean-Claude Martinou, co-lead author of the study.

Reference:Petrelli F, Scandella V, Montessuit S, Zamboni N, Martinou JC, Knobloch M. Mitochondrial pyruvate metabolism regulates the activation of quiescent adult neural stem cells. Science Advances. 2023;9(9):eadd5220. doi:10.1126/sciadv.add5220

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.

Read more:
Metabolic Mechanism Activates Stem Cells in the Adult Brain - Technology Networks

Early Mayo Clinic research finds hope in stem cell therapy for … – EurekAlert

ROCHESTER, Minn. A dissolvable plug delivered stem cell therapy with few side effects in patients with single tractperianal fistulas,Mayo Clinicresearchers discovered. Perianal fistulas are painful tunnels between the intestine and the skin that often do not go away with standard medical or surgical care. People withCrohn's diseaseor otherinflammatory bowel conditionsare most at risk for this condition.

In a prospective, phase 1 clinical trial, researchers loaded stem cells from a patient's own fat tissue onto a bioabsorbable plug that was then surgically implanted to close the anal fistula tract. They followed the patients for one year and reported results of their early research inDiseases of the Colon & Rectum.

"In this early study, our team documented healing of single-tract fistulas," saysEric Dozois, M.D., a colorectal surgeon and first author on the study. "In my 20 years of clinical experience, our fistula research suggests we are getting closer to a care model."

As many as 26% of people with Crohn's disease will develop perianal fistulas. Most often, it starts with an infection within the anal gland and often progresses into an abscess that sometimes requires surgery. Left untreated, perianal fistulas leak fecal material and can lead to permanent colostomy and, in some cases, cancer. A colostomy is a surgical opening in the abdomen that bypasses the damaged colon to rid the body of solid waste. Perianal fistulas can cause quality-of-life challenges, such as the need to wear pads to protect clothing and prevent odor.

"Perianal fistulas are a complex medical condition that, even when repaired surgically, can reoccur, causing a lot of suffering for patients," saysWilliam Faubion Jr., M.D., a gastroenterologist and senior author on the study. "Our hope with this research is to advance a cell-based therapy toward daily clinical care that would be easy to implant in the operating room and offer a new option for patients with unmet needs."

The research

The research team extracted mesenchymal stem cells from adipose (fat) tissue of 20 patients with perianal fistulas who had not responded to standard medical or surgical treatment. Mesenchymal stem cells are adult stem cells with healing potential that have been well studied. After multiplying the stem cells in the lab, the team combined the cells with a plug created from a dissolvable material. They surgically implanted the plug to close the anal fistula tract then monitored the patients seven times within 12 months, with a focus on investigating safety. They also studied whether the treatment intervention led to clinical healing that could be confirmed through deep tissue imaging.

Dr. Dozois' team documented complete healing of 14 patients at six months and 13 patients at one year. Three patients withdrew for various reasons during the course of the clinical trial.

Four participants reported side effects such as infections that required admission to the hospital or surgical draining of an abscess. Twelve participants experienced reactions considered to be minor, such as redness, fever or nausea.

Based on their findings, Dr. Dozois' team is recommending further study of the stem cell-coated fistula plug with larger sample sizes and more types of fistulas. If all goes well, it could take two or three years before this procedure is approved for routine clinical care.

Dr. Dozois, Dr. Faubion and Mayo Clinic have financial interests in the regenerative fistula plug technology. Any profits Mayo Clinic realizes from its business ventures are reinvested in research and education initiatives at Mayo.

###

About Mayo ClinicMayo Clinicis a nonprofit organization committed to innovation in clinical practice, education and research, and providing compassion, expertise and answers to everyone who needs healing. Visit theMayo Clinic News Networkfor additional Mayo Clinic news.

Diseases of the Colon & Rectum

Durable Response in Patients With Refractory Fistulizing Perianal Crohns Disease Using Autologous Mesenchymal Stem Cells on a Dissolvable Matrix: Results from the Phase I Stem Cell on Matrix Plug Trial

Dr. Dozois, Dr. Faubion and Mayo Clinic have financial interests in the regenerative fistula plug technology. Any profits Mayo Clinic realizes from its business ventures are reinvested in research and education initiatives at Mayo.

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.

Read the original here:
Early Mayo Clinic research finds hope in stem cell therapy for ... - EurekAlert

Stem cell therapy may reduce risk of heart attack and stroke in … – CTV News

Published Feb. 27, 2023 3:30 p.m. ET

Cell therapy, involving adult stem cells from bone marrow, has been shown to reduce the risk of heart attack and stroke in severe heart failure patients, according to a new study.

A single administration of adult stem cells directly into an inflamed heart, through a catheter, could result in a long-term 58 per cent reduced risk of heart attack or stroke among heart failure patients with reduced ejection fraction, meaning they have a weakened heart muscle, suggests the study, published Monday in the Journal of the American College of Cardiology.

The study is being called the largest clinical trial of cell therapy to date in patients with heart failure, a serious condition that occurs when the heart can't pump enough blood to meet the body's needs.

"We followed these patients during several years -- three years -- and what we found was that their hearts got stronger. We found a very significant reduction in heart attack and stroke, especially in the patient that we measured in their blood that they had more inflammation going on," said the study's lead author Dr. Emerson Perin, a practicing cardiologist and medical director at The Texas Heart Institute in Houston.

"That effect, it was there across everyone, but for the patient that had inflammation, it was even more significant," Perin said. "And there also is evidence that we had a reduction in cardiovascular deaths."

The therapy involves injecting mesenchymal precursor cells into the heart. These particular stem cells have anti-inflammatory properties, which could improve outcomes in heart failure patients since elevated inflammation is a hallmark feature of chronic heart failure.

More than 6 million adults in the United States have chronic heart failure, and most are treated with drugs that address the symptoms of the condition. The patients included in the new study were all taking medications for heart failure, and the new research suggests that cell therapy can be beneficial when used in conjunction with heart failure drugs.

"You can imagine, we keep everybody going and doing better with the medicine. And now we have a treatment that actually addresses the cause and quiets everything down. So, this line of investigation really has a great future and I can see that, with a confirmatory trial, we can bring this kind of treatment into the mainstream," Perin said.

"We can treat heart failure differently," he said. "We have a new weapon against heart failure and this study really opens the door and leads the way for us to be able to get there."

The new study -- sponsored by Australian biotechnology company Mesoblast -- included 565 heart failure patients with a weakened heart muscle, ages 18 to 80. The patients were screened between 2014 and 2019 and randomly assigned to either receive the cell therapy or a placebo procedure at 51 study sites across North America.

The patients who received the cell therapy were delivered about 150 million stem cells to the heart through a catheter. The cells came from the bone marrow of three healthy young adult donors.

The researchers, from The Texas Heart Institute and other various institutions in the United States, Canada and Australia, then monitored each patient for heart-related events or life-threatening arrhythmias.

Compared with the patients who received a sham procedure, those treated with the stem cell therapy showed a small but statistically significant strengthening of the muscle of the heart's left pumping chamber within a year.

The researchers also found that the cell therapy decreased the risk of heart attack or stroke by 58 per cent overall.

"This is a long-term effect, lasting an average of 30 months. So that's why we're so excited about it," Perin said.

Among patients with high inflammation in their bodies, the combined reduced risk of heart attack or stroke was even greater, at 75 per cent, the researchers found.

"These cells directly address inflammation," Perin said.

"They have little receptors for these inflammatory substances -- some of them are called interleukins, and there's other kinds," he said. "When you put them into an inflamed heart, it activates the cells and the cells go, 'Wow, we need to respond. This house is on fire. We need to put out the fire.' And so they then secrete various anti-inflammatories."

The researchers wrote in their study that their findings should be considered as "hypothesis generating," in that they show this cell therapy concept could work, but clinical trials would be needed to specifically confirm the effects of these stem cells on heart attack, stroke and other events. It is still unclear for how long the effects of the stem cell therapy last beyond 30 months and whether patients will need more stem cell injections in the future.

Overall, there were no major differences between the adverse events reported among the patients who received the cell therapy compared with those in the control group, and the researchers reported no major safety concerns.

"We've made an enormous step to be able to harness the real power of adult stem cells to treating the heart," Perin said. "This trial really is a signal of a new era."

For more than a decade, scientists have been studying potential stem cell therapies for heart failure patients -- but more research is needed to determine whether this treatment approach could reduce the amount of hospitalizations, urgent care events or complications among patients with heart failure.

The new study didn't find that, said cardiologist Dr. Nieca Goldberg, medical director of Atria New York City and clinical associate professor of medicine at NYU Grossman School of Medicine, who was not involved in the latest study.

What the new study did find is that "there may be a population of people that could benefit from the stem cell therapy, particularly people who have inflammation," Goldberg said.

"It's actually an interesting therapy, an interesting thing to consider, once more research substantiates its benefit. Because in heart failure, there's multiple things going on and, particularly for the inflammatory component, this could be an interesting treatment," she said. "It might have some role in heart failure patients with inflammation."

The therapy's effects on heart attack or stroke risks "were positive," Dr. Brett Victor, a cardiologist at the Cardiology Consultants of Philadelphia, who was not involved in the study, said in an email.

"Specifically, patients who received the stem cell therapy were less likely to have a heart attack or stroke over the next 2.5 years, especially among those who were found to have a high degree of systemic inflammation as measured by a laboratory test," Victor said in the email, adding that this represents how heart failure has a significant inflammatory component.

Those "positive signals" likely will be evaluated more in subsequent studies, Victor said.

"Current therapies for heart failure including lifestyle modifications, a growing list of excellent medications, and device therapies will continue to be the standard of care for treatment in the near-term," he said. "I suspect that this trial will continue to move the field forward in studying cardiac cell therapy as we continue to look for ways to not just treat, but actually find a cure for this disease."

Read more:
Stem cell therapy may reduce risk of heart attack and stroke in ... - CTV News

How to awaken neural stem cells and reactivate them? – Tech Explorist

Cellular metabolism is essential for adult neural stem/progenitor cell (NSPC) behavior. These cells can be reactivated to form new neurons. However, its role in the transition from quiescence to proliferation has yet to be fully understood.

A team led by scientists from the Universities of Geneva (UNIGE) and Lausanne (UNIL) has discovered the importance of cell metabolism in this process and identified how to wake up these neural stem cells and reactivate them. They successfully increased the number of new neurons in the brain of adult and even elderly mice.

The brain is constructed during embryonic development by neural stem cells (NSCs), which produce all other central nervous system cells, including neurons. Interestingly, NSCs keep growing and can produce new neurons in specific brain regions even after the brain has fully developed. Adult neurogenesis is a biological process crucial for particular tasks, including memory and learning.

However, in the adult brain, these stem cells become more silent or dormant and reduce their capacity for renewal and differentiation. As a result, neurogenesis decreases significantly with age.

Scientists uncovered a metabolic mechanism by which adult NSCs can emerge from their dormant state and become active.

Francesco Petrelli, a research fellow at UNIL and co-first author of the study with Valentina Scandella, said,We found that mitochondria, the energy-producing organelles within cells, regulate the level of activation of adult NSCs.

A crucial component in this control is played by the mitochondrial pyruvate transporter (MPC), a protein complex first identified by Professor Martinous team eleven years ago. Its activity affects the available metabolic possibilities for a cell. Scientists can awaken dormant cells by altering their mitochondrial metabolism by understanding the metabolic mechanisms that separate active cells from dormant cells.

By utilizing chemical inhibitors or creating mutant mice for the Mpc1 gene, biologists have been able to block MPC activity. The scientists stimulated dormant NSCs and subsequently generated new neurons in the brains of adult and even old mice by using pharmacological and genetic approaches.

Professor Knobloch, co-lead author of the study, said,With this work, we show that redirection of metabolic pathways can directly influence the activity state of adult NSCs and consequently the number of new neurons generated.

Jean-Claude Martinou, co-lead author of the study, said,These results shed new light on the role of cell metabolism in regulating neurogenesis. In the long term, these results could lead to potential treatments for conditions such as depression or neurodegenerative diseases.

Journal Reference:

Link:
How to awaken neural stem cells and reactivate them? - Tech Explorist

Stem cell therapy: A possible solution to save our coral reefs – The Miami Hurricane

This article was the 2022 first-place winner of the University of Miami Graduate Op-Ed Challenge.

Imagine your next snorkeling vacation at a barren underwater desert. The vibrant corals and bright flashes of darting fish reduced to nothing but a bleak wasteland.This reality is around the corner.

Weve been seeing a decline in coral reef health for decades. Scientists have undeniably proven that greenhouse gas emissions are responsible for the global increase in temperature and ocean acidification, the top contributors to coral decline. Yet, political and economic restraints prevent the reversal of greenhouse gas emissions at a sufficient rate.

So how can we buy corals the time they need until such drastic changes can be met? The answer might be in human medicine.

Patients diagnosed with leukemia or Non-Hodgkins lymphoma are often faced with intense, harmful treatments of chemotherapy or radiation. This leaves the body with a diminished blood cell supply. Its becoming common to follow these treatments with stem cell therapies to reintroduce healthy stem cells, ultimately providing new blood cells and mitigating unpleasant symptoms. Could the same be done for corals?

Coral gardening is currently the favored practice of coral preservation amongst coral conservationists. Artificial structures, usually made out of PVC pipes or plastic mesh, are built to provide a nursery. On these nurseries, small coral fragments are cultivated by conservationists and volunteers until they reach an optimal size. At this point they are outplanted on the reef using a marine epoxy, or glue. While efforts can focus on corals that are more tolerant of higher temperatures, this technique requires endless hours of manpower, reduces the diversity of corals on the reef and is time-consuming due to corals slow-growing nature. While this method has undoubtedly provided relief for many reefs, it is not sustainable enough for the future of corals.

Optimal solutions would be able to prevent the declining health of adult corals already present on the reef. To this end, genome editing and probiotic treatments are examples of solutions under consideration. These methods hold water and should be further explored, but they present their own issues.

As in human cancer patients, stem cell therapy may be the ideal solution. Transplanting stem cells from a resilient coral to one more susceptible, would preserve adult corals already existing on the reef, maintain the genetic diversity, require less maintenance by conservationists and volunteers and maintain the reef structure which is so necessary for the entire ecosystem. So why havent we tried stem cell therapy on corals?

The problem is simple: we dont know if corals have stem cells. Closely related animals (think anemones and jellyfish) have been shown to possess these regenerative cells, suggesting corals might, too.

Testing this is no simple task, unfortunately. A common method of identifying stem cells in other animals is to use a fluorescent tag for common stem cell-associated markers, similar to how we detect antibodies. However, corals possess a wide range of natural fluorescent proteins, making it impossible to distinguish the stem cell markers. To overcome this, researchers at the University of Miami have identified a population of cells that exhibit many characteristics of stem cells across the animal kingdom. These small, structurally simple and rare cells show a gene expression signature similar to an unspecialized cell, which provides convincing evidence that these are indeed stem cells.

With this kernel of hope, the next stage of this research is addressing the logistics: How do we transplant stem cells, and which corals should act as the donors? Corals are essentially animals in rock-form, making classic needle-based injections a challenging mode of transplantation.

One avenue to explore is the application of short-term hydrogels. Commonly used as wound dressings in humans, hydrogels are an ideal substance for donor cell transfers, and act as a physical barrier against physical damage and infection.

The second factor to consider is which corals should serve as the donors. Just as our blood type determines from whom we can receive blood transfusions, there may be genetic compatibility factors that will need to be considered on top of resiliency to heat and other stressors. However, considering that many coral species are capable of growing and fusing together, the probability of successful transplantations seems high.

Despite the hurdles, this research should proceed. We are way past the luxury of questioning if human intervention is necessary or acceptable. According to greenhouse gas emission and temperature predictions by the Intergovernmental Panel on Climate Change, corals will face annual mass bleaching and mortality events by 2050. The current methods of coral conservation are simply not enough, and we need to be more effective in our efforts if we are going to save the coral reefs we rely upon and love. Stem cell therapy could be the answer.

Grace Snyder is a graduate student at the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science, studying the capability of coral stem cell transplantations.

See original here:
Stem cell therapy: A possible solution to save our coral reefs - The Miami Hurricane