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Animal study suggests that newborn period may be crucial time to prevent later diabetes
Date:11/2/2011

Pediatric researchers who tested newborn animals with an existing human drug used in adults with diabetes report that this drug, when given very early in life, prevents diabetes from developing in adult animals. If this finding can be repeated in humans, it may become a way to prevent at-risk infants from developing type 2 diabetes.

"We uncovered a novel mechanism to prevent the later development of diabetes in this animal study," said senior author Rebecca A. Simmons, M.D., a neonatologist at The Children's Hospital of Philadelphia. "This may indicate that there is an important developmental window, a period of time in which we can intervene to permanently protect the body's insulin-producing cells."

Simmons and lead author Sara E. Pinney, M.D., a pediatric endocrinologist at Children's Hospital, published the study in the October issue of Diabetologia.

The research may be relevant to children with intrauterine growth retardation (IUGR), a common complication during the mother's pregnancy. Simmons' previous research showed that IUGR, which is associated with decreased availability of nutrients and hormones to the developing fetus, permanently alters gene expression and impairs the function of insulin-producing cells in the pancreas. These defects have been shown to cause type 2 diabetes to develop in adulthood.

The study team used exendin-4 (Ex-4), a drug recently approved for use in adults with type 2 diabetesa condition in which a patient produces insufficient insulin, or is unable to process insulin normally. Although the drug's mechanism is not known, it has a hormone-like effect, raising insulin secretion in adults.

In their study, Simmons and Pinney used rats with an induced form of IUGR. They found that after being given to newborn rats, Ex-4 had epigenetic effectsmodifying gene function without changing the underlying DNA sequences. Ex-4 increased the expression of a gene called Pdx1 that is necessary
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Contact: John Ascenzi
Ascenzi@email.chop.edu
267-426-6055
Children's Hospital of Philadelphia
Source:Eurekalert

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