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Targeting neurotransmitter may help treat gastrointestinal conditions
Date:12/4/2012

HERSHEY, Pa. -- Selective targeting of the neurotransmitter that differentially affects brain cells that control the two distinct functions of the pancreas may allow for new medication therapies for conditions like diabetes, dyspepsia and gastro-esophageal reflux, according to Penn State College of Medicine researchers.

"This study differs from what's been reported previously about brain neurons that control the gastrointestinal tract," said R. Alberto Travagli, professor, Department of Neural and Behavioral Sciences, and lead investigator. "It provides further support to the idea that separate nerve pathways regulate the diverse functions of organs along the upper gastrointestinal tract."

The pancreas has two functional parts: one that releases digestive enzymes, and one that releases hormones like insulin and glucagon. The vagus nerve, which originates in the brain, regulates both of these pancreatic functions. This nerve detects chemical and biological changes that occur along the gastrointestinal tract and interprets and integrates these signals before sending appropriate responses back to the organs. In the brain, these signals tell the nerves controlling each specific organ what the proper response is -- for example, digestive processes and insulin release -- according to the signals detected in the GI tract.

Neurotransmitters in the brain and in organs like the pancreas control the nerve networks that receive these signals. Neurotransmitters are chemicals released from nerves that allow them to communicate with each other as well as with organs of the body. One of these neurotransmitters is glutamate, which acts on specific proteins called receptors that are present on the nerve cells. There are different classes and types of receptors that glutamate can act upon; one major class of these receptors is metabotropic glutamate receptors (mGluRs). This class is further divided into three subgroups -- I, II or III -- depending on their location
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Contact: Matthew Solovey
msolovey@hmc.psu.edu
717-531-8606
Penn State
Source:Eurekalert

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