This shows a colony of induced pluripotent stem cells. Blue fluorescence indicates cell nuclei; red and green are markers of pluripotency. Credit: Image: Courtesy of the Salk Institute for Biological Studies

Salk scientists have identified a unique molecular signature in induced pluripotent stem cells (iPSCs), "reprogrammed" cells that show great promise in regenerative medicine thanks to their ability to generate a range of body tissues.

In this week's Proceedings of the National Academy of Sciences, the Salk scientists and their collaborators at University of California, San Diego, report that there is a consistent, signature difference between embryonic and induced pluripotent stem cells. The findings could help overcome hurdles to using the induced stem cells in regenerative medicine.

"We believe that iPSCs hold a great potential for the treatment of human patients," says Juan Carlos Izpisua Belmonte, a professor in Salk's Gene Expression Laboratory and the senior author on the paper. "Yet we must thoroughly understand the molecular mechanisms governing their safety profile in order to be confident of their function in the human body. With the discovery of these small, yet apparent, epigenetic differences, we believe that we are now one step closer to that goal."

Embryonic stem cells (ESCs) are known for their "pluripotency," the ability to differentiate into nearly any cell in the body. Because of this ability, it has long been thought that ESCs would be ideal to customize for therapeutic uses. However, when ESCs mature into specific cell types, and are then transplanted into a patient, they may elicit immune responses, potentially causing the patient to reject the cells.

In 2006, scientists discovered how to revert mature cells, which had already differentiated into particular cell types, such as skin cells or hair cells, back into a pluripotent state. These "induced pluripotent stem cells" (iPSCs), which could be developed from the patient's own cells, would theoretically carry no risk of immune rejection.

However, scientists found that iPSCs had molecular differences from embryonic stem cells. Specifically, there were epigenetic changes, chemical modifications in DNA that might alter genetic activity. At certain points in the iPSC's genome, scientists could see the presence of different patterns of methyl groups when compared to the genomes of ESCs. It seemed these changes occurred randomly.

Izpisua Belmonte and his colleagues wanted to understand more about these differences. Were they truly random, or was there a discernable pattern?

Unlike previous studies, which had primarily analyzed iPSCs derived from only one mature type of cells (mainly connective tissue cells called fibroblasts), the Salk and UCSD researchers examined iPSCs derived from six different mature cell types to see if there were any commonalities. They discovered that while there were hundreds of unpredictable changes, there were some that remained consistent across the cell types: the same nine genes were associated with these common changes in all iPSCs.

"We knew there were differences between iPSCs and ESCs," says Sergio Ruiz, first author of the paper, "We now have an identifying mark for what they are."

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Discovery of reprogramming signature may help further stem cell-based regenerative medicine research

MARLBOROUGH, Mass.--(BUSINESS WIRE)--

Advanced Cell Technology, Inc. (ACT) (ACTC), a leader in the field of regenerative medicine, announced today that director of business development, Matthew Vincent, Ph.D., will be presenting at Terrapinns Stem Cells USA and Regenerative Medicine Congress, September 20-21 in Boston.

Dr. Vincents presentation, Advancing stem cell therapies to the clinic: ACT's three cellular therapy programs, will be given on Thursday, Sept. 20 at 3:15 p.m. EDT. Dr. Vincent will discuss the meaning and significance of the results seen thus far in ACTs three ongoing human clinical trials in the U.S. and E.U. for Dry Age-Related Macular Degeneration (Dry AMD) and Stargardts Macular Dystrophy (SMD).

About SMD, Dry AMD and Degenerative Diseases of the Retina

Stargardts Macular Dystrophy (SMD) is one of the most common forms of macular degeneration in the world. SMD causes progressive vision loss, usually starting in children between 10 to 20 years of age. Eventually, blindness results from photoreceptor loss associated with degeneration in the pigmented layer of the retina, called the retinal pigment epithelium or RPE cell layer.

Degenerative diseases of the retina are among the most common causes of untreatable blindness in the world. As many as thirty million people in the United States and Europe suffer from macular degeneration, which represents a $25-30 billion worldwide market that has yet to be effectively addressed. Approximately 10% of people ages 66 to 74 will have symptoms of macular degeneration, the vast majority the dry form of AMD which is currently untreatable. The prevalence increases to 30% in patients 75 to 85 years of age.

About Advanced Cell Technology, Inc.

Advanced Cell Technology, Inc., is a biotechnology company applying cellular technology in the field of regenerative medicine. For more information, visit http://www.advancedcell.com.

Forward-Looking Statements

Statements in this news release regarding future financial and operating results, future growth in research and development programs, potential applications of our technology, opportunities for the company and any other statements about the future expectations, beliefs, goals, plans, or prospects expressed by management constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any statements that are not statements of historical fact (including statements containing the words will, believes, plans, anticipates, expects, estimates, and similar expressions) should also be considered to be forward-looking statements. There are a number of important factors that could cause actual results or events to differ materially from those indicated by such forward-looking statements, including: limited operating history, need for future capital, risks inherent in the development and commercialization of potential products, protection of our intellectual property, and economic conditions generally. Additional information on potential factors that could affect our results and other risks and uncertainties are detailed from time to time in the companys periodic reports, including the report on Form 10-K for the year ended December 31, 2011. Forward-looking statements are based on the beliefs, opinions, and expectations of the companys management at the time they are made, and the company does not assume any obligation to update its forward-looking statements if those beliefs, opinions, expectations, or other circumstances should change. Forward-looking statements are based on the beliefs, opinions, and expectations of the companys management at the time they are made, and the company does not assume any obligation to update its forward-looking statements if those beliefs, opinions, expectations, or other circumstances should change. There can be no assurance that the Companys clinical trials will be successful.

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ACT to Present at Terrapinn’s Stem Cells & Regenerative Medicine Congress in Boston

ScienceDaily (Sep. 18, 2012) Salk scientists have identified a unique molecular signature in induced pluripotent stem cells (iPSCs), "reprogrammed" cells that show great promise in regenerative medicine thanks to their ability to generate a range of body tissues.

In this week's Proceedings of the National Academy of Sciences, the Salk scientists and their collaborators at University of California, San Diego, report that there is a consistent, signature difference between embryonic and induced pluripotent stem cells. The findings could help overcome hurdles to using the induced stem cells in regenerative medicine.

"We believe that iPSCs hold a great potential for the treatment of human patients," says Juan Carlos Izpisua Belmonte, a professor in Salk's Gene Expression Laboratory and the senior author on the paper. "Yet we must thoroughly understand the molecular mechanisms governing their safety profile in order to be confident of their function in the human body. With the discovery of these small, yet apparent, epigenetic differences, we believe that we are now one step closer to that goal."

Embryonic stem cells (ESCs) are known for their "pluripotency," the ability to differentiate into nearly any cell in the body. Because of this ability, it has long been thought that ESCs would be ideal to customize for therapeutic uses. However, when ESCs mature into specific cell types, and are then transplanted into a patient, they may elicit immune responses, potentially causing the patient to reject the cells.

In 2006, scientists discovered how to revert mature cells, which had already differentiated into particular cell types, such as skin cells or hair cells, back into a pluripotent state. These "induced pluripotent stem cells" (iPSCs), which could be developed from the patient's own cells, would theoretically carry no risk of immune rejection.

However, scientists found that iPSCs had molecular differences from embryonic stem cells. Specifically, there were epigenetic changes, chemical modifications in DNA that might alter genetic activity. At certain points in the iPSC's genome, scientists could see the presence of different patterns of methyl groups when compared to the genomes of ESCs. It seemed these changes occurred randomly.

Izpisua Belmonte and his colleagues wanted to understand more about these differences. Were they truly random, or was there a discernable pattern?

Unlike previous studies, which had primarily analyzed iPSCs derived from only one mature type of cells (mainly connective tissue cells called fibroblasts), the Salk and UCSD researchers examined iPSCs derived from six different mature cell types to see if there were any commonalities. They discovered that while there were hundreds of unpredictable changes, there were some that remained consistent across the cell types: the same nine genes were associated with these common changes in all iPSCs.

"We knew there were differences between iPSCs and ESCs," says Sergio Ruiz, first author of the paper, "We now have an identifying mark for what they are."

The therapeutic significance of these nine genes awaits further research. The importance of the current study is that it gives stem cells researchers a new and more precise understanding of iPSCs.

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Discovery of reprogramming signature may help overcome barriers to stem cell-based regenerative medicine

SAN ANTONIO--(BUSINESS WIRE)--America Stem Cell, Inc. (ASC) today announced that it has been awarded an Advanced Technology Small Business Technology Transfer Research (STTR) grant from the National Heart Lung and Blood Institute at the National Institutes of Health. This grant will be conducted in collaboration with scientists at the Wake Forest Institute of Regenerative Medicine (WFIRM) in Winston-Salem, NC, and will explore the combination of two technologies: ASC-101 developed by America Stem Cell and amniotic fluid-derived stem cells discovered and pioneered by Dr. Shay Soker and colleagues at WFIRM. We will examine the effect of ASC-101-treated amniotic fluid-derived stem cells in an experimental model of compartment syndrome. Compartment syndrome results from a variety of injuries such as fractures, contusions, burns, trauma, post-ischemic swelling and blast injuries such as gunshot wounds. If not addressed quickly, it can lead to considerable loss of muscle tissue. Musculoskeletal disorders are the primary cause of disability in the United States with associated costs of more than $800 billion annually. In addition to civilian injuries, more than 42,000 soldiers have been injured since the beginning of the Iraq and Afghanistan wars: the majority of these injuries were musculoskeletal in nature.

The successful combination of ASC-101 with amniotic fluid-derived stem cells would be directly relevant to improving the treatment of muscle damage that occurs following compartment syndrome as well as multiple other types of injuries.

America Stem Cell has demonstrated that ASC-101 enhances the ability of stem cells to migrate to their target tissue. While most companies are concerned with the type of cells used for cell therapy (i.e. the hardware), America Stem Cell addresses how to get the cells to go where they are needed most (i.e. the software). With this award, America Stem Cell will expand the potential for therapeutic application of ASC-101 with amniotic fluid-derived stem cells. According to Dr. Leonard Miller, the Co-Principal Investigator on the grant, The successful combination of ASC-101 with amniotic fluid-derived stem cells would be directly relevant to improving the treatment of muscle damage that occurs following compartment syndrome as well as multiple other types of injuries.

America Stem Cell, Inc. is a clinical stage company that is in clinical trials at the University of Texas M.D. Anderson Cancer Center for improving clinical outcomes for cancer patients undergoing hematopoietic stem cell transplantation. This award enables America Stem Cell to expand the development of ASC-101 to yet another cell type. Lynnet Koh, CEO of America Stem Cell, noted, The combination of ASC-101 with amniotic fluid-derived stem cells could synergistically enhance the therapeutic and regenerative capacity of these cells and most importantly provide an off-the-shelf, effective solution for tissue damage due to multiple types of injuries or diseases. ASC-101 is a transformative technology with the potential to improve clinical outcomes for patients undergoing a wide variety of cell therapies for the treatment of diseases such as graft versus host disease, diabetic complications, and ischemic diseases such as myocardial infarctions, retinopathy and critical limb ischemia. America Stem Cell has established a number of collaborations examining the potential of ASC-101 to improve cell therapies for multiple clinical conditions using a wide variety of cell types.

About America Stem Cell, Inc.

America Stem Cell is a privately held biotechnology company based in San Antonio, TX, with offices in San Diego, CA, and is dedicated to the development and commercialization of enabling technologies to enhance and expand the therapeutic potential of cell therapies. The key technology platforms (ASC-101 and ASC-102) are designed to improve the homing and engraftment of cells to target organs. ASC-101 is currently in clinical trials to improve the therapeutic potential of hematopoietic stem cells for patients in need of hematopoietic stem cell transplantation. Additionally, these technologies have the potential to enhance the efficacy of cell therapies for the treatment of inflammation from chemotherapy/radiation, autoimmune diseases, and ischemic diseases including myocardial infarction and stroke. America Stem Cell has partnerships and collaborations with Kyowa Hakko Kirin, Spectrum Medical Innvoations, Florida Biologix, and various medical research institutions including the University of Texas M.D. Anderson Cancer Center, Oklahoma Medical Research Foundation, Fred Hutchinson Cancer Center,,University of California San Diego, Sanford-Burnham Institute, Indiana University, Juvenile Diabetes Research Foundation, as well as corporate partnerships. For additional information, please contact Lynnet Koh at 210-410-6427, or view http://www.americastemcell.com.

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America Stem Cell, Inc. Awarded a Phase I STTR to Explore the Therapeutic Potential of Its Platform Technology (ASC ...

17.09.2012 - (idw) Max-Delbrck-Centrum fr Molekulare Medizin (MDC) Berlin-Buch

Muscles have a pool of stem cells which provides a source for muscle growth and for regeneration of injured muscles. The stem cells must reside in special niches of the muscle for efficient growth and repair. The developmental biologists Dr. Dominique Brhl and Prof. Carmen Birchmeier of the Max Delbrck Center for Molecular Medicine (MDC) Berlin-Buch have elucidated how these stem cells colonize these niches. At the same time, they show that the stem cells weaken when, due to a mutation, they locate outside of the muscle fibers instead of in their stem cell niches (Developmental Cell, http://dx.doi.org/10.1016/j.devcel.2012.07.014)*. Muscle stem cells, also called satellite cells, colonize a niche that is located between the plasma membrane of the muscle cell and the surrounding basal lamina. Already in newborns these niches contain satellite cells from which both muscle cells and new stem cells can be generated.

Weakened stem cells In the present study Dr. Brhl and Professor Birchmeier showed that mouse muscle progenitor cells lacking components of the Notch signaling pathway cannot colonize their niche. Instead the muscle progenitor cells locate in tissue between the muscle fibers. The developmental biologists view this as the cause for the weakening of the muscles. The stem cells that are in the wrong place are no longer as potent as they originally were and hardly contribute to muscle growth.

In addition, the Notch signaling pathway has a second function in muscle development. It prevents the differentiation of stem cells into muscle cells through suppression of the muscle developmental factor MyoD and thus ensures that there will always be a pool of stem cells for muscle repair and regeneration. In the future this work could gain in importance for research on muscle regeneration and muscle weakness.

Contact: Barbara Bachtler Press Department Max Delbrck Center for Molecular Medicine (MDC) Berlin-Buch in the Helmholtz Association Robert-Rssle-Strae 10; 13125 Berlin, Germany Phone: +49 (0) 30 94 06 - 38 96; Fax: +49 (0) 30 94 06 - 38 33 e-mail: presse@mdc-berlin.de http://www.mdc-berlin.de/ function fbs_click() {u=location.href;t=document.title;window.open('http://www.facebook.com/sharer.php?u='+encodeURIComponent(u)+'&t='+encodeURIComponent(t),'sharer','toolbar=0,status=0,width=626,height=436');return false;} html .fb_share_link { padding:2px 0 0 20px; height:16px; background:url(http://static.ak.facebook.com/images/share/facebook_share_icon.gif?6:26981) no-repeat top left; } Share on Facebook

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At the Right Place at the Right Time - New Insights into Muscle Stem Cells