Monthly Archive for January, 2010Page 3 of 3

Experimental drug shows promise against brain, prostate cancers

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An experimental drug currently being tested against breast and lung cancer shows promise in fighting the brain cancer glioblastoma and prostate cancer, researchers at UT Southwestern Medical Center have found in two preclinical studies.

The drug’s actions, observed in isolated human cells in one trial and in rodents in the other, are especially encouraging because they attacked not only the bulk of the tumor cells but also the rare cancer stem cells that are believed to be responsible for most of a cancer’s growth, said Dr. Jerry Shay, professor of cell biology and a senior co-author of both papers. The glioblastoma study appears in the January issue of Clinical Cancer Research. The prostate cancer study is available online in the International Journal of Cancer.

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Vitamin C Enhances the Generation of Mouse and Human Induced Pluripotent Stem Cells

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Somatic cells can be reprogrammed into induced pluripotent stem cells (iPSCs) by defined factors. However, the low efficiency and slow kinetics of the reprogramming process have hampered progress with this technology. Here we report that a natural compound, vitamin C (Vc), enhances iPSC generation from both mouse and human somatic cells. Vc acts at least in part by alleviating cell senescence, a recently identified roadblock for reprogramming.

In addition, Vc accelerates gene expression changes and promotes the transition of pre-iPSC colonies to a fully reprogrammed state. Our results therefore highlight a straightforward method for improving the speed and efficiency of iPSC generation and provide additional insights into the mechanistic basis of the reprogramming process.► Vitamin C improves the speed and efficiency of mouse iPSC generation ► Adding vitamin C converts pre-iPSCs to iPSCs ► Vitamin C alleviates the senescence roadblock to reprogramming ► Human iPSC generation is also improved by vitamin C

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Melton plans to construct a “living test tube” for probing the interplay between the beta cells and the immune system in diabetes, sellstem vit c.

Enhanced stem cells promote tissue regeneration

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MIT engineers have boosted stem cells’ ability to regenerate vascular tissue (such as blood vessels) by equipping them with genes that produce extra growth factors (naturally occurring compounds that stimulate tissue growth). In a study in mice, the researchers found that the stem cells successfully generated blood vessels near the site of an injury, allowing damaged tissue to survive.

Why it matters: Stem cells hold great potential as a way to promote tissue regeneration. However, this approach has been limited because stem cells don’t produce enough growth factors after transplantation. The researchers’ new super-charged stem cells could be used to treat an infarction (death of tissue caused by blockage of the blood supply, by a clot or another obstruction), or to induce blood supply for engineered tissues.

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Pfizer Acquires a Stem-Cell Therapy

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Pfizer said Sunday that it was buying the rights to a somewhat controversial cell therapy from Athersys, a biotechnology company — a sign of big pharmaceutical companies’ growing interest in stem cells.

Pfizer will have the rights to develop Athersys’s cells to treat inflammatory bowel disease, the companies are expected to announce on Monday. It will pay Athersys $6 million initially and up to $105 million in the future.

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athersys scotland, pfizer stem cells 2010.

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