Biosingularity

Archive for September 2006

The results of the world’s first multicenter clinical trial of islet transplantation have confirmed the technique’s potential benefits in patients with difficult-to-control type 1 (or “juvenile”) diabetes. Published in the September 28, 2006 issue of the New England Journal of Medicine, the international team of investigators report that the Edmonton Protocol for islet transplantation can safely and successfully promote long-term stabilization of blood sugar levels in “brittle” diabetes patients and in some cases, relieve them of the need for insulin injections altogether for at least two years.
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An analysis of mice infected with the reconstructed 1918 influenza virus has revealed that although the infection triggered a very strong immune system response, the response failed to protect the animals from severe lung disease and death.
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A jumping gene first identified in a cabbage-eating moth may one day provide a safer, target-specific alternative to viruses for gene therapy, researchers say.

They compared the ability of the four best-characterized jumping genes, or transposons, to insert themselves into a cell’s DNA and produce a desired change, such as making the cell resistant to damage from radiation therapy.

They found the piggyBac transposon was five to 10 times better than the other circular pieces of DNA at making a home and a difference in several mammalian cell lines, including three human ones.
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-A Yale School of Medicine study shows for the first time that a high level of testosterone, such as that caused by the use of steroids to increase muscle mass or for replacement therapy, can lead to a catastrophic loss of brain cells.

Taking large doses of androgens, or steroids, is known to cause hyperexcitability, a highly aggressive nature, and suicidal tendencies. These behavioral changes could be evidence of alterations in neuronal function caused by the steroids, said the senior author, Barbara Ehrlich, professor of pharmacology and physiology.
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Boosting levels of a protein in the heart might help protect against the development of heart failure, particularly in those who have had heart attacks.

Cardiology researchers at the Center for Translational Medicine at Jefferson Medical College of Thomas Jefferson University in Philadelphia found that increasing levels of the protein S100A1 above normal helped protect animal hearts from further damage after simulated heart attacks. In some cases, the animals’ heart function hardly changed at all. At the same time, other animals with heart cells lacking the gene for the protein couldn’t handle the stress of a heart blockage; they went on to develop heart failure.
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A two-step process appears to regulate cell fate decisions for many types of developing cells, according to researchers from the University of Chicago.

This finding sheds light on a puzzling behavior. For some differentiating stem cells, the first step leads not to a final decision but to a new choice. In response to the initial chemical signal, these cells take on the genetic signatures of two different cell types. It often requires a second signal for them to commit to a single cellular identity.
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A team of researchers has genetically engineered normal immune cells to become specialized tumor fighters, demonstrating for the first time that these engineered cells can persist in the body and shrink large tumors in humans.
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