Category Archives: Stem Cell Research

July 5, 2012

Connie K. Ho for redOrbit.com Your Universe Online

Stem cell research is gaining headway, but is still controversial. Scientists hope that a new discovery regarding stem cells from amniotic fluid will pave the way to an alternative option. A collaborative group of researchers recently discovered that stem cells in amniotic fluid can be changed into a more flexible state, which could possibly open another option to embryonic stem cells.

The study was recently published in the journal Molecular Therapy and it described how a team of investigators from Imperial College London and the UCL Institute of Child Health were successful in reprogramming amniotic fluids without introducing extra genes.

Based on the findings, the researchers believe that stem cells from amniotic fluid could be held in banks for therapy or research purposes. Amniotic fluid, which surrounds and feeds the fetus, can be taken from the mothers abdomen with a needle during amniocentesis and has stem cells from the fetus. These stem cells have more limitations in developing into other cells as compared to embryonic stem cells.

These cells have a wide range of potential applications in treatments and in research. We are particularly interested in exploring their use in genetic diseases diagnosed early in life or other diseases such as cerebral palsy, noted Dr. Pascale Guillot, a representative of the Department of Surgery and Cancer at Imperial College London, in a prepared statement.

In the project, the scientists utilized stem cells that were donated from mothers who were undergoing amniocentesis; amniocentesis has been used in the past in testing for genetic diseases. The cells were then grown on a gelatinous protein mixture in a lab and reprogrammed into a lower state by adding the drug valproic acid to the culture medium. The results showed that the reprogrammed cells had traits like those found in embryonic stem cells; embryonic stem cells have pluripotency, which means they have the ability to develop into any cell type found in the body. In particular, the reprogrammed cells from the amniotic fluid were able to develop into functioning cells like bone, liver, and nerve cells. The cells were also able to stay pluripotent after they were frozen and rethawed.

Amniotic fluid stem cells are intermediate between embryonic stem cells and adult stem cells. They have some potential to develop into different cell types but they are not pluripotent. Weve shown that they can revert to being pluripotent just by adding a chemical reagent that modifies the configuration of the DNA so that genes that are expressed in the embryo get switched back on, explained Guillot in the statement.

The findings from the project showed that stem cells from amniotic fluid can possibly be used in treatments for a number of diseases, disease research, and drug screenings. Researchers are positive about the alternative to embryonic stem cells, as there is a limited number of donor embryos available. The study by Guillot and his colleagues shows that it is possible to have pluripotency in human cells without introducing foreign genetic material into the cells.

This study confirms that amniotic fluid is a good source of stem cells. The advantages of generating pluripotent cells without any genetic manipulation make them more likely to be used for therapy, remarked Dr. Paolo De Coppi, a member of the UCL Institute of Child Health who led the research with Guillot, in the statement. At GOSH we have focused on building organs and tissues for the repair of congenital malformations, which are usually diagnosed during pregnancy. Finding the way of generating pluripotent cells from the fluid that surround the fetus in the womb move us one step further in the this direction.

Link:
Stem Cells Extracted From Amniotic Fluid

NOTCH1 Signaling Promotes T-Cell Acute Lymphoblastic Leukemia-Initiating Cell Regeneration

Newswise Research suggests that patients with leukemia sometimes relapse because standard chemotherapy fails to kill the self-renewing leukemia initiating cells, often referred to as cancer stem cells. In such cancers, the cells lie dormant for a time, only to later begin cloning, resulting in a return and metastasis of the disease.

One such type of cancer is called pediatric T cell acute lymphoblastic leukemia, or T-ALL, often found in children, who have few treatment options beyond chemotherapy.

A team of researchers led by Catriona H. M. Jamieson, MD, PhD, associate professor of medicine at the University of California, San Diego School of Medicine and Director of Stem Cell Research at UC San Diego Moores Cancer Center studied these cells in mouse models that had been transplanted with human leukemia cells. They discovered that the leukemia initiating cells which clone, or replicate, themselves most robustly activate the NOTCH1 pathway, usually in the context of a mutation.

Earlier studies showed that as many as half of patients with T-ALL have mutations in the NOTCH1 pathway an evolutionarily conserved developmental pathway used during differentiation of many cell and tissue types. The new study shows that when NOTCH1 activation was inhibited in animal models using a monoclonal antibody, the leukemia initiating cells did not survive. In addition, the antibody treatment significantly reduced a subset of these cancer stem cells (identified by the presence of specific markers, CD2 and CD7, on the cell surface.)

We were able to substantially reduce the potential of these cancer stem cells to self-renew, said Jamieson. So were not just getting rid of cancerous cells: were getting to the root of their resistance to treatment leukemic stem cells that lie dormant.

The study results suggest that such therapy would also be effective in other types of cancer stem cells, such as those that cause breast cancer, that also rely on NOTCH1 for self-renewal.

Therapies based on monoclonal antibodies that inhibit NOTCH 1 are much more selective than using gamma-secretase inhibitors, which also block other essential cellular functions in addition to the NOTCH1 signaling pathway, said contributor A. Thomas Look, MD of Dana-Farber/Children Hospital Cancer Center in Boston. We are excited about the promise of NOTCH1-specific antibodies to counter resistance to therapy in T-ALL and possibly additional types of cancer.

In investigating the role of NOTCH1 activation in cancer cell cloning, the researchers showed that leukemia initiating cells possess enhanced survival and self-renewal potential in specific blood-cell, or hematopoietic, niches: the microenvironment of the body in which the cells live and self-renew.

The scientists studied the molecular characterization of CD34+ cells a protein that shows expression in early hematopoietic cells and that facilitates cell migration from a dozen T-ALL patient samples.

Read this article:
Researchers Block Pathway to Cancer Cell Replication

Halfway around the world in India, Sivaprakash Ramalingam had heard of Johns Hopkins researchers using a promising new technique for gene therapy that he hoped to integrate with stem cells to cure diseases.

After getting a doctorate in biochemistry in his native country, he came to Baltimore four years ago to study under the technique's pioneer, Srinivasan Chandrasegaran, at Hopkins' Bloomberg School of Public Health. Ramalingam's research has led him down the path of seeking a cure for sickle cell anemia, a painful, life-shortening blood disorder that afflicts many in his home region in southern India. In the United States, the disease affects 70,000-100,000 people, mostly African-Americans, according to the National Heart Lung and Blood Institute.

"I couldn't have done this type of research in India," said Ramalingam. "I wanted to use this technique with stem cells to treat disease."

Ramalingam's research was given a lift last month by the state. He was one of 17 researchers who was funded by the Maryland Stem Cell Research Commission, a state entity that has doled out roughly $10 million to $12 million a year in taxpayer funds since its founding in 2006.

The program helps keep Maryland competitive in stem cell research when other states have instituted similar ones to lure scientists and biotechnology companies. More than 100 researchers applied for funding from the program, many from Johns Hopkins and the University of Maryland.

"There's definitely a great demand for the awards," said Dan Gincel, the commission's director. "We're trying to figure out how to fund so many researchers."

Gincel said Ramalingam's work is interesting because his approach could have applications beyond sickle cell anemia. It could be used to treat other diseases and, for instance, modify plants and crops to make them resistant to pests.

Ramalingam received a $110,000 award two years ago from the commission to help fund his post-doctoral fellowship; the commission invested more money in his work this year because he was continuing to progress with it, Gincel said.

"The approach can be translated to many other diseases, which is what we want to see with stem cells," said Gincel.

Ramalingam is applying a relatively new technique called zinc finger nuclease, or ZFN, to try to cure sickle cell anemia. With ZFN, Ramalingam is able to target and replace specific, problem-causing sequences of the human genome with healthier genetic material.

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Researcher hunts for sickle cell anemia cure

Editor's Choice Main Category: Huntingtons Disease Also Included In: Stem Cell Research;Neurology / Neuroscience Article Date: 29 Jun 2012 - 14:00 PDT

Current ratings for: Brain Cells Derived From Skin Cells For Huntington's Research

3 (1 votes)

At present, there is no cure for the disease and no treatments are available. These findings open up the possibility of testing treatments for the deadly disorder in a petri dish.

The study is the work of a Huntington's Disease iPSC Consortium, including researchers from the Johns Hopkins University School of Medicine in Baltimore, Cedars-Sinai Medical Center in Los Angeles and the University of California, Irvine, and six other groups.

Huntington's disease is an inherited, deadly neurodegenerative disorder. The onset of HD generally occurs during midlife, although it can also strike in childhood - as in the patient who donated the material for the cells generated in this study. The disease causes jerky, twitch-like movements, lack of muscle control, psychiatric disorders and dementia, and ultimately death.

Christopher A. Ross, M.D., Ph.D., a professor of psychiatry and behavioral sciences, neurology, pharmacology and neuroscience at the Johns Hopkins University School of Medicine and one of the lead researchers of the study, explained:

The team are currently testing small molecules for the ability to block HP iPSC degeneration. According to the researchers, these molecules could potentially be developed into new drugs for Huntington's disease.

Furthermore, the teams ability to create "HD in a dish" may also have implications for similar research in other diseases such as Parkinson's and Alzheimer's.

In the study, the team took a skin biopsy from a 7-year-old patient with very early onset of severe HD. In the laboratory of Hongjun Song, Ph.D., a professor at Johns Hopkins' Institute for Cell Engineering, the skin cells were grown in culture and then created into pluripotent stem cells. In addition, a second cell line was created in the same way in Dr. Ross's lab from an individuals without HD.Simultaneously, other HD and control iPS cell lines were generated as part of the NINDS funded HD iPS cell consortium.

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Brain Cells Derived From Skin Cells For Huntington's Research

DUBLIN--(BUSINESS WIRE)--

Research and Markets (http://www.researchandmarkets.com/research/4ghhzd/handbook_of_stem_c) has announced the addition of Elsevier Science and Technology's new report "Handbook of Stem Cells, Two-Volume Set. Edition No. 2" to their offering.

New discoveries in the field of stem cells increasingly dominate the news and scientific literature revealing an avalanche of new knowledge and research tools that are producing therapies for cancer, heart disease, diabetes, and a wide variety of other diseases that afflict humanity. The Handbook of Stem Cells integrates this exciting area of life science, combining in two volumes the requisites for a general understanding of adult and embryonic stem cells. Organized in two volumes entitled Pluripotent Stem Cells & Cell Biology and Adult & Fetal Stem Cells, this work contains contributions from the world's experts in stem cell research to provide a description of the tools, methods, and experimental protocols needed to study and characterize stem cells and progenitor populations as well as a the latest information of what is known about each specific organ system.

- Provides comprehensive coverage on this highly topical subject

- Contains contributions by the foremost authorities and premiere names in the field of stem cell research

- Companion website contains over 250 color figures in presentation format

For more information visit http://www.researchandmarkets.com/research/4ghhzd/handbook_of_stem_c

Source: Elsevier Science and Technology

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Research and Markets: Handbook of Stem Cells, Two-Volume Set. Edition No. 2

Halfway around the world in India, Sivaprakash Ramalingam had heard of Johns Hopkins researchers using a promising new technique for gene therapy that he hoped to integrate with stem cells to cure diseases.

After getting a doctorate in biochemistry in his native country, he came to Baltimore four years ago to study under the technique's pioneer, Srinivasan Chandrasegaran, at Hopkins' Bloomberg School of Public Health. Ramalingam's research has led him down the path of seeking a cure for sickle cell anemia, a painful, life-shortening blood disorder that afflicts many in his home region in southern India. In the United States, the disease affects 70,000-100,000 people, mostly African-Americans, according to the National Heart Lung and Blood Institute.

"I couldn't have done this type of research in India," said Ramalingam. "I wanted to use this technique with stem cells to treat disease."

Ramalingam's research was given a lift last month by the state. He was one of 17 researchers who was funded by the Maryland Stem Cell Research Commission, a state entity that has doled out roughly $10 million to $12 million a year in taxpayer funds since its founding in 2006.

The program helps keep Maryland competitive in stem cell research when other states have instituted similar ones to lure scientists and biotechnology companies. More than 100 researchers applied for funding from the program, many from Johns Hopkins and the University of Maryland.

"There's definitely a great demand for the awards," said Dan Gincel, the commission's director. "We're trying to figure out how to fund so many researchers."

Gincel said Ramalingam's work is interesting because his approach could have applications beyond sickle cell anemia. It could be used to treat other diseases and, for instance, modify plants and crops to make them resistant to pests.

Ramalingam received a $110,000 award two years ago from the commission to help fund his post-doctoral fellowship; the commission invested more money in his work this year because he was continuing to progress with it, Gincel said.

"The approach can be translated to many other diseases, which is what we want to see with stem cells," said Gincel.

Ramalingam is applying a relatively new technique called zinc finger nuclease, or ZFN, to try to cure sickle cell anemia. With ZFN, Ramalingam is able to target and replace specific, problem-causing sequences of the human genome with healthier genetic material.

Here is the original post:
Researcher hunts for sickle cell anemia cure with gene targeting, stem cells

MOBILE, Alabama -- The Baldwin County doctor that treated former Alabama football players with adult stem cells also has treated at least two people diagnosed with amyotrophic lateral sclerosis, also known as Lou Gehrigs disease.

One of the ALS patients, former NFL football player and college coach Frank Orgel, recently underwent a new stem cell reprogramming technique performed by Dr. Jason R. Williams at Precision StemCell in Gulf Shores.

Before the injections, Orgels health had declined. He could not move his left arm or leg. He couldnt walk or stand on his own, he said.

Within a few days of having the stem cell treatment, Orgels constant muscle twitching diminished, said Bob Hubbard, director of stem cell therapy at the practice. Within weeks, he was able to walk in a pool of water and stand unassisted.

I think its helped me, said Orgel, who was a defensive coordinator at Auburn under former head coach Pat Dye. Im walking in the pool and I used to drag my feet. Now my left leg is picking up.

ALS is a progressive neuro-degenerative disease that affects nerve cells in the brain and the spinal cord. The progressive degeneration of the motor neurons in ALS eventually leads to death, according to the ALS Association.

Stem cells, sometimes called the bodys master cells, are precursor cells that develop into blood, bones and organs, according to the U.S. Food and Drug Administration, which regulates their use. Their promise in medicine, according to many scientists and doctors, is that the cells have the potential to help and regenerate other cells.

While Williams treatments are considered investigational, he has said, they meet FDA guidelines because the stem cells are collected from a patients fat tissue and administered back to that patient during the same procedure.

Orgel, 74, said Williams told him it would take between eight months to a year for his nerves to regrow. He is traveling to Gulf Shores from his home in Albany, Ga., this weekend for another stem cell treatment, Orgel said: I need to get to where I can walk.

In recent years, Orgel has gone to Mexico at least three times for different types of treatments, not sanctioned in the U.S. At least once, he said, he had placenta cells injected into his body. That didnt work, Orgel said. I didnt feel any better.

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Former Auburn coach getting stem cell treatments for Lou Gehrig's disease

BOSTON The University of Massachusetts Medical School and the Massachusetts Life Sciences Center have agreed to phase out operation of the embryonic stem cell bank in Shrewsbury, saying the facility, which is 4 years old, has largely outlived its usefulness.

The stem cell bank, slated for closure at the end of the year, was established at the medical school alongside a stem cell registry that collects stem cell research data, to store embryonic stem cell lines from an array of research centers and make them available to scientists around the world.

It was set up at a time when the federal government had banned use of federal funds for research using embryonic stem cells. That ban put in place by President George W. Bush was withdrawn by President Barack Obama after he took office in 2009.

State funding for the bank came as part of a larger state effort to expand life science research across Massachusetts using targeted state grants, tax benefits and by supporting facilities such as the stem cell bank.

Angus G. McQuilken, spokesman for the Life Sciences Center that awarded the project $8.6 million to open and operate, said yesterday that the school and Life Sciences officials have agreed to wind down the bank's operations by the end of this year.

He said the stem cell registry, which received $1.7 million in startup and operational funding from the Life Sciences Center, remains a valued center for compilation of stem cell research and will remain in operation and continue receiving funds from the Life Science Center.

When this investment was made in 2007 it filled an important gap, Mr. McQuilken said, referring to the restrictions on federal support for embryonic stem cell research. Stem cell lines are now more readily available from multiple sources.

Future investment by the state in stem cell research will move in a different direction. The university is building the $400 million Albert Sherman Center, a major new genetic research facility at its Worcester campus.

While it may have quickly outlived its usefulness, the initial investment in the stem cell bank was an important one that made an important statement about the state's commitment to stem cell research, Mr. McQuilken said.

A medical school spokesman said closing the stem cell bank is expected to eliminate about nine jobs. Those displaced will be encouraged to seek other positions at the medical school, officials said.

Continue reading here:
Stem cell bank, age 4, to be closed

An international consortium of Huntington's disease experts, including several from the Sue & Bill Gross Stem Cell Research Center at UC Irvine and the UCSF Gladstone Institutes, has generated a human model of the deadly inherited disorder directly from the skin cells of affected patients.

The re-created neurons, which live in a petri dish, will help researchers better understand what disables and kills brain cells in people with HD and let them gauge the effects of potential drug therapies on cells that are otherwise locked deep in the brain.

UCI scientists were part of a consortium that in 1993 identified the autosomal dominant gene mutation responsible for HD, but there is still no cure, and no treatments are available to even slow its onset or progression. The research, published online today in the journal Cell Stem Cell, is the work of the Huntington's Disease iPSC Consortium. Participants examined several other cell lines and control cell lines to ensure that their results were consistent and reproducible in different labs.

"Our discovery will enable us for the first time to test therapies on human Huntington's disease neurons," said Leslie Thompson, UCI professor of psychiatry & human behavior and neurobiology & behavior, one of the world's leading HD experts and a senior author of the study. "This has been a remarkable time in HD research, with the advent of stem cell technologies that have allowed these scientific advancements. Also, having a team of scientists working together as a consortium has benefited the research tremendously and accelerated its pace."

Huntington's is such a rare disease, although it is the most common inherited neurodegenerative disorder. It afflicts approximately 30,000 people in the United States-with another 75,000 people carrying the gene that will eventually lead to it.

"An advantage of this human model is that we now have the ability to identify changes in brain cells over time-during the degeneration process and at specific stages of brain-cell development," said Gladstone Senior Investigator Dr. Steve Finkbeiner. "We hope this model will help us more readily uncover relevant factors that contribute to Huntington's disease and especially to find successful therapeutic approaches."

UC Irvine press release

Gladstone Institutes press release

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Huntington’s disease neurons created from stem cells

SHREWSBURY, Mass.The stem cell bank at the University of Massachusetts is set to run out of cash and close at the end of this year.

State and university officials tell The Boston Globe (http://bo.st/LQi71Z ) that changes in technology and federal policies around stem cell research have made obsolete the facility at the U-Mass Medical Center's Shrewsbury campus.

The stem cell bank was established in 2008 with the help of $8.6 million state funding, part of Gov. Deval Patrick's effort to boost the life sciences industry in Massachusetts. Human stem cells were kept and distributed to researchers working on potential cures for diseases and spinal cord injuries.

Experts say new technologies for producing stem cells and the loosening of federal restrictions on research have significantly altered the need for facilities like the one at U-Mass.

Information from: The Boston Globe, http://www.boston.com/globe

Copyright 2012 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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Stem cell bank at UMass to close at year's end