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Beta cells:  Another cure for Type 1 diabetes ... in mice

By Christine Cotter / Los Angeles Times (c) 

Scientists have been searching for a way to cure Type 1 diabetes by regenerating the insulin-producing beta cells in the pancreas that are lost in the disease. Without them, the body is unable to metabolize sugar, forcing patients to compensate by injecting themselves with insulin several times a day.

One popular strategy has been to try to get embryonic stem cells or induced pluripotent stem cells -- which can theoretically become any type of human cell -- to grow into the beta cells that diabetes patients need. Last year researchers from Harvard University took a huge shortcut and transformed normal pancreas cells into the coveted beta cells by activating a trio of dormant genes.

Insulin2 Today a team of European and American researchers report that pancreatic cells in diabetic mice could be reprogrammed into beta cells by turning on just one gene, called Pax4.

The scientists gave the mice a drug called streptozotocin that killed off their beta cells while preserving other types of pancreatic cells. Then they activated the Pax4 gene, which does most of its work during fetal development.

For some reason that the researchers don’t yet understand, the therapy worked best on mice that were less than one month old. For them, the treatment completely counteracted the symptoms of Type 1 diabetes.

In fact, it may have worked too well, leaving the mice with a shortage of alpha cells. Before this approach can be tried in humans, scientists will need to figure out a safe way to turn on the Pax4 gene -- and then find a way to shut it off.

“A lot of 'ifs' remain before we will know whether it could be taken to the clinic,” said the study’s lead author, Patrick Collombat, a researcher at the Max Planck Institute for Biophysical Chemistry in Germany. But for Type 1 diabetes patients who are currently treated with daily insulin injections, he said in a statement, this much is clear: “We need a better treatment. We need to find a way to regenerate beta cells.”

For more information:
Christine Cotter / Copyright 2009 Los Los Angeles Times
http://latimesblogs.latimes.com/booster_shots/2009/08/type-1-diabetes-beta-cell-therapy.html