Stem Cell Clinic

Alzheimer’s disease risk linked to a network of genes associated with myeloid cells – Medical Xpress

June 26, 2017 PET scan of a human brain with Alzheimer's disease. Credit: public domain

Many genes linked to late-onset Alzheimer's disease (AD) are expressed in myeloid cells and regulated by a single protein, according to research conducted at the Icahn School of Medicine at Mount Sinai and published June 19 in the journal Nature Neuroscience.

Mount Sinai researchers led an international, genome-wide study of more than 40,000 people with and without the disease and found that innate immune cells of the myeloid lineage play an even more central role in Alzheimer's disease pathogenesis than previously thought.

Specifically, the research team identified a network of genes that are implicated in AD and expressed by myeloid cells, innate immune cells that include microglia and macrophages. Furthermore, researchers identified the transcription factor PU.1, a protein that regulates gene expression and, thus, cell identity and function, as a master regulator of this gene network.

"Our findings show that a large proportion of the genetic risk for late-onset AD is explained by genes that are expressed in myeloid cells, and not other cell types," says Alison Goate, DPhil, Professor of Neuroscience and Director of The Ronald M. Loeb Center for Alzheimer's Disease at the Icahn School of Medicine at Mount Sinai and principal author of the study. "Dysregulation of this network is certainly a cause of Alzheimer's, but we have more work to do to better understand this network and regulation by PU.1, to reveal promising therapeutic targets."

Using a combination of genetic approaches to analyze the genomes of 14,406 AD patients, and 25,849 control patients who do not have the disease, researchers found that many genes which are known to influence the age at which AD sets in, are expressed in myeloid cells. This work pinpointed SPI1, a gene that encodes the transcription factor PU.1, as a major regulator of this network of AD risk genes and demonstrated that lower levels of SPI1/PU.1 are associated with later age at onset of AD.

To test the hypothesis that SPI1 expression levels influence expression of other AD risk genes and microglial function, the researchers used a mouse microglial cell line, BV2 cells that can be cultured in a dish. When researchers knocked down expression of SPI1, the gene that produces PU.1 in cells, they found that the cells showed lower phagocytic activity (engulfment of particles), while overexpression of SPI1 led to increased phagocytic activity. Many other AD genes expressed in microglia also showed altered expression in response to this manipulation of SPI1 expression.

"Experimentally altering PU.1 levels correlated with phagocytic activity of mouse microglial cells and the expression of multiple AD genes involved in diverse biological processes of myeloid cells," says Dr. Goate. "SPI1/PU.1 expression may be a master regulator capable of tipping the balance toward a neuroprotective or a neurotoxic microglial function."

The researchers stress that because the PU.1 transcription factor regulates many genes in myeloid cells, the protein itself may not be a good therapeutic target. Instead, further studies of PU.1's role in microglia and AD pathogenesis are necessary, as they may reveal promising downstream targets that may be more effective in modulating AD risk without broad effects on microglial function. Increased understanding is crucial to facilitating the development of novel therapeutic targets for a disease that currently has no cure.

Explore further: Phagocytes in the braingood or bad?

More information: Kuan-lin Huang et al. A common haplotype lowers PU.1 expression in myeloid cells and delays onset of Alzheimer's disease, Nature Neuroscience (2017). DOI: 10.1038/nn.4587

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Bone Therapeutics receives Intent to Grant Notice from European Patent Office for allogeneic bone cell therapy platform – OrthoSpineNews

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Gosselies, Belgium,26 June 2017; 7am CEST BONE THERAPEUTICS (Euronext Brussels and Paris: BOTHE), the bone cell therapy company addressing high unmet medical needs in orthopaedics and bone diseases, today announces that the European Patent Office (EPO) has notified the Company of its intention to grant a key patent covering its first-in-class allogeneic cell therapy technology.

Once granted, the patent titled, Osteogenic differentiation of bone marrow stem cells and mesenchymal stem cells using a combination of growth factors, will provide legal protection to Bone Therapeutics both for the manufacturing methods and for the distinct cell type used in its allogeneic cell therapy technology. Specifically, the patent covers methods to manufacture differentiated and biologically active osteoblastic (bone-forming) cells from bone marrow stem cells, using a specific combination of growth factors, and also covers a new class of osteoblastic cells suitable for allogeneic administration to the patient.

Bone Therapeutics will now validate the patent in several countries in the European Union, potentially allowing IP protection for its allogeneic bone cell therapy platform until 2029. Patents from the same patent family have already been granted in Japan, Australia and Singapore and applications are pending in the USA, Canada, India and South Korea. ALLOB, Bone Therapeutics most advanced allogeneic bone cell therapy product, is currently being evaluated in Phase I/IIA clinical trials for delayed-union fractures and spinal fusion, for which interim results are expected in the third quarter this year.

Thomas Lienard, Chief Executive Officer of Bone Therapeutics, commented: This notice from the European Patent Office confirms our allogeneic bone cell therapy technology is both innovative and distinctive. When granted, this European patent will significantly strengthen our IP position in the field of bone cell therapy, giving us further validation for the scientific and commercial development of our cell therapy products whilst also enhancing our position with respect to new partnerships.

Dr. Miguel Forte, Chief Medical Officer of Bone Therapeutics, further noted: Obtaining this patent is an important step in the development of our allogeneic bone cell therapy technology. It will provide a solid IP protection for our current work and for future technological advances, allowing us to continue our efforts to create patient-centric and commercially interesting bone cell therapy solutions.

About Bone Therapeutics

Bone Therapeutics is a leading cell therapy company addressing high unmet needs in orthopaedics and bone diseases. Based in Gosselies, Belgium, the Company has a broad, diversified portfolio of bone cell therapy products in clinical development across a number of disease areas targeting markets with large unmet medical needs and limited innovation. Our technology is based on a unique, proprietary approach to bone regeneration which turns undifferentiated stem cells into osteoblastic, or bone-forming cells. These cells can be administered via a minimally invasive procedure, avoiding the need for invasive surgery. Our primary clinical focus is ALLOB, an allogeneic off-the-shelf cell therapy product derived from stem cells of healthy donors, which is in Phase II studies for the treatment of delayed-union fractures and spinal fusion. The Company also has an autologous bone cell therapy product, PREOB, obtained from patients own bone marrow and currently in Phase III development for osteonecrosis and non-union fractures.

Bone Therapeutics cell therapy products are manufactured to the highest GMP standards and are protected by a rich IP estate coveringnine patent families. Further information is available at: http://www.bonetherapeutics.com.

Certain statements, beliefs and opinions in this press release are forward-looking, which reflect the Company or, as appropriate, the Company directors current expectations and projections about future events. By their nature, forward-looking statements involve a number of risks, uncertainties and assumptions that could cause actual results or events to differ materially from those expressed or implied by the forward-looking statements. These risks, uncertainties and assumptions could adversely affect the outcome and financial effects of the plans and events described herein. A multitude of factors including, but not limited to, changes in demand, competition and technology, can cause actual events, performance or results to differ significantly from any anticipated development. Forward looking statements contained in this press release regarding past trends or activities should not be taken as a representation that such trends or activities will continue in the future. As a result, the Company expressly disclaims any obligation or undertaking to release any update or revisions to any forward-looking statements in this press release as a result of any change in expectations or any change in events, conditions, assumptions or circumstances on which these forward-looking statements are based. Neither the Company nor its advisers or representatives nor any of its subsidiary undertakings or any such persons officers or employees guarantees that the assumptions underlying such forward-looking statements are free from errors nor does either accept any responsibility for the future accuracy of the forward-looking statements contained in thispress release or the actual occurrence of the forecasted developments. You should not place undue reliance on forward-looking statements, which speak only as of the date of this press release.

Josh Sandberg has been an executive search consultant focused exclusively on orthopedic and spine start-ups since 2004. He has had a tremendous impact in helping his clients avoid costly hiring mistakes by his deep industry knowledge and network. In 2010, Josh co-founded Ortho Spine Companies, which is the parent company of Ortho Spine Distributors (OSD), Surg.io and Ortho Sales Partners (OSP). OSD a searchable database that helps ease the frustration of finding orthopedic distributors throughout the country. Surg.io is the ultimate distributor toolkit that offers distributors the tools necessary to build the foundation of a scalable and highly functioning sales organization. OSP is an end-to-end solution that helps companies approach the Global Market in a cost efficient way. Our team has hundreds of years of experience and can help you navigate the many challenges present in bringing new technologies to the market.

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Bone Therapeutics receives Intent to Grant Notice from European Patent Office for allogeneic bone cell therapy platform - OrthoSpineNews

Study shines light on brain cells that coordinate movement – Medical Xpress

June 26, 2017 In this image of neurons in the cerebellum of the brain, the yellow cells are Purkinje cells in which the channelrhodopsin-2 gene is being produced. Credit: Horwitz Lab/UW Medicine Seattle

UW Medicine researchers have developed a technique for inserting a gene into specific cell types in the adult brain in an animal model.

Recent work shows that the approach can be used to alter the function of brain circuits and change behavior. The study appears in the journal Neuron in the NeuroResources section.

Gregory Horwitz, associate professor of physiology and biophysics at the University of Washington School of Medicine in Seattle, led the research team. He said that the approach will allow scientists to better understand what roles select cell types play in the brain's complex circuitry.

Researchers hope that the approach might someday lead to developing treatments for conditions, such as epilepsy, that might be curable by activating a small group of cells.

"The brain is made up of a mix of many cell types performing different functions. One of the big challenges for neuroscience is finding ways to study the function of specific cell types selectively without affecting the function of other cell types nearby," Horwitz said. "Our study shows it is possible to selectively target a specific cell type in an adult brain using this technique and affect behavior nearly instantly."

In their study, Horowitz and his colleagues at the Washington National Primate Research Center in Seattle inserted a gene into cells in the cerebellum, a small structure located at the back of the brain and tucked under the brain's larger cerebrum.

The cerebellum's primary function is controlling motor movements. Disorders of the cerebellum generally lead to often disabling loss of coordination. Recent research suggests the cerebellum may also be important in learning and may be involved in such conditions as autism and schizophrenia.

The cells the scientists selected to study are called Purkinje cells. These cells, named after their discoverer, Czech anatomist Jan Evangelista Purkinje, are some of the largest in the human brain. They typically make connections with hundreds of other brain cells.

"The Purkinje cell is a mysterious cell," said Horwitz. "It's one of the biggest and most elaborate neurons and it processes signals from hundreds of thousands of other brain cells. We know it plays a critical role in movement and coordination. We just don't know how."

The gene they inserted, called channelrhodopsin-2, encodes for a light-sensitive protein that inserts itself into the brain cell's membrane. When exposed to light, it allows ions - tiny charged particles - to pass through the membrane. This triggers the brain cell to fire.

The technique, called optogenetics, is commonly used to study brain function in mice. But in these studies, the gene must be introduced into the embryonic mouse cell.

"This 'transgenic' approach has proved invaluable in the study of the brain," Horwitz said. "But if we are someday going to use it to treat disease, we need to find a way to introduce the gene later in life, when most neurological disorders appear."

The challenge for his research team was how to introduce channelrhodopsin-2 into a specific cell type in an adult animal. To achieve this, they used a modified virus that carried the gene for channelrhodopsin-2 along with segment of DNA called a promoter. The promoter stimulates the cell to start expressing the gene and make the channelrhodopsin-2 membrane protein. To make sure the gene was expressed only by Purkinje cells, the researchers used a promoter that is strongly active in Purkinje cells, called L7/Pcp2."

In their paper, the researchers reported that by painlessly injecting the modified virus into a small area of the cerebellum of rhesus macaque monkeys, the channelrhodopsin-2 was taken up exclusively by the targeted Purkinje cells. The researchers then showed that when they exposed the treated cells to light through a fine optical fiber, they were able stimulate the cells to fire at different rates and affect the animals' motor control.

Horwitz said that it was the fact that Purkinje cells express L7/Pcp2 promoter at a higher rate than other cells that made them more likely to produce the channelrhodopsin-2 membrane protein.

"This experiment demonstrates that you can engineer a viral vector with this specific promoter sequence and target a specific cell type," he said. "The promoter is the magic. Next, we want to use other promoters to target other cell types involved in other types of behaviors."

Explore further: New insights into control of neuronal circuitry could lead to treatments for an inherited motor disorder

More information: Yasmine El-Shamayleh et al, Selective Optogenetic Control of Purkinje Cells in Monkey Cerebellum, Neuron (2017). DOI: 10.1016/j.neuron.2017.06.002

Journal reference: Neuron

Provided by: University of Washington

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Cancer hijacks natural cell process to survive – Medical Xpress – Medical Xpress

June 26, 2017 Credit: CC0 Public Domain

Cancer tumours manipulate a natural cell process to promote their survival suggesting that controlling this mechanism could stop progress of the disease, according to new research led by the University of Oxford.

Non-sense mediated decay (NMD) is a natural physiological process that provides cells with the ability to detect DNA errors called nonsense mutations. It also enables these cells to eliminate the mutated message (decay) that comes from these faulty genes, before they can be translated into proteins that can cause disease formation. NMD is known among the medical community for the role it plays in the development of genetic diseases such as Cystic Fibrosis and some hereditary forms of cancers. But not all nonsense mutations can elicit NMD, so until now, it's wider impact on cancer was largely unknown.

Biomedical researchers and computer scientists from the University of Oxford Medical Sciences Division and the University of Birmingham developed a computer algorithm to mine DNA sequences from cancer to accurately predict whether or not an NMD would eliminate genes that had nonsense mutations. The work originally focused on ovarian cancers, and found that about a fifth of these cancers use NMD, to become stronger. This is because NMD ensures that the message from a gene called TP53, which ordinarily protects cells from developing cancer is almost completely eliminated. In the absence of NMD, a mutated TP53 might still retain some activity but NMD ensures that this is not the case.

Based on this research, the team predicts that because cancers essentially feed on NMD, they become dependent on it in some cases. If scientists were therefore able to inhibit or control the process, it is possible that they could also control cancer and prevent the progression of the disease.

Dr Ahmed Ahmed, Co-author and Professor of Gynaecology Oncology at the Nuffield Department of Obstetrics & Gynaecology and the head of the Ovarian Cancer Cell Laboratory, at the Weatherall Institute of Molecular Medicine at the University of Oxford, said: "Our first observations of evidence of the role of NMD in ovarian cancer were tantalizing. We found that NMD precisely explained why there was almost no expression of TP53 in certain ovarian cancers. We went on to test the role of NMD in other cancer types and the evidence of the role of NMD was compelling. This opens the door for exciting possibilities for customised treatments including individualized immunotherapies for patients in the future."

Following the ovarian cancer analysis, the team expanded the study to include other cancer types. They analysed about a million different cell mutations in more than 7,000 tumours from the Cancer Genome Atlas covering 24 types of cancer. The team was able to map how each cancer type used NMD revealing the remarkable extent to which NMD helps cancer to survive.

Katherine Taylor, CEO of Ovarian Cancer Action, who part-funded the research, said: "This is very exciting news. Professor Ahmed and his team have identified how cancer cells rely on a process called NMD for their survival. This discovery could help clinicians identify and inhibit the process, giving them much better control of a person's cancer.

"Ovarian cancer is a very complicated disease and survival rates are low, with only 46% of women living beyond five years after diagnosis. So understanding how we can prevent the disease from thriving is imperative if we are to improve the outcome for more women.

"It's fantastic to see how our funding is helping make real progress and we couldn't do this without the generosity of our supporters. We look forward to seeing where Professor Ahmed takes his research next."

Moving forward the team will focus on testing their theory and understanding to what degree stopping the NMD process allows them to control tumours.

Co-author, Dr Christopher Yau, a computational scientist at the Institute of Cancer and Genomic Sciences, University of Birmingham said: "As a result of these findings, we now plan to apply the same computer algorithm to determine if NMD affects cancer patients in The 100,000 Genomes Project. These investigations may pave the way to new treatment possibilities for NHS patients in the future."

Explore further: Two Oxford research discoveries offer hope for managing ovarian cancer

More information: The full paper citation is 'A pan-cancer genome-wide analysis reveals tumour dependencies by induction of nonsense-mediated decay,' and it will be published in Nature Communications on Monday 26 June 2017.

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Israeli Scientists Offer Simple Test to Identify Diseases from Dying Cells – The Jewish Press – JewishPress.com

Photo Credit: Hebrew University

One of the holy grails of medical research is the development of a simple non-invasive test that can detect a variety of diseases with high accuracy. To date there is no single diagnostic test that fulfills this function.

To solve this problem, Prof. Yuval Dor and Dr. Ruth Shemer at the Hebrew University of Jerusalem (together with Prof. Ben Glaser, Head of the Endocrinology Department at the Hadassah Medical Center) developed a new blood test that looks for the remnants of dying cells cast off by specific tissue types throughout the body.

When cells die, they release DNA fragments into the circulatory system. The DNA of each type of dying cell carries a unique chemical modification called methylation. By detecting the unique methylation signatures of DNA from the fragments of dying cells, Prof. Dor and Dr. Shemer have established a way to detect multiple disease processes including diabetes, cancer, traumatic injury and neurodegeneration in a highly sensitive and specific manner.

Prof. Dor and Dr. Shemer are researchers at the Institute for Medical Research-Israel Canada (IMRIC) in the Hebrew Universitys Faculty of Medicine. Both earned their PhDs at the Hebrew University.

A test that accurately pinpoints tissue damage from dying cells DNA fragments could hold the key to a variety of medical advances from a deeper understanding of human tissue dynamics, to earlier detection of life-threatening illnesses, to more efficient monitoring of responses to medical therapies.

Prof. Dor and Dr. Shemer envision a future where the continued research and refinement of their new technology will lead to a universal, rapid, sensitive and quantitative blood test for tissue-specific cell death. This blood test could be used to assess multiple pathologic conditions simultaneously, equivalent to standard blood chemistry panels in use today.

Their paper describing the method and its applications was published in the Proceedings of the National Academy of Sciences, in 2016, drawing considerable interest from the scientific and popular media. In recognition of their work, Prof. Dor and Dr. Shemer were awarded the Kaye Innovation Award for 2017.

Aurum Ventures MKI Ltd., the technology investment arm of Morris Kahn, provided Yissum, the Technology Transfer arm of the Hebrew University, with $1.2 million of funding for research and development of this new diagnostic approach. Earlier this year, OnTimeBio was founded to make Prof. Dors and Dr. Shemers vision become a reality.

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Israeli Scientists Offer Simple Test to Identify Diseases from Dying Cells - The Jewish Press - JewishPress.com

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