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A truncated form of the glucagon-like peptide 1 receptor (GLP-1R) agonist exendin-4 peptide, with GLP-1 receptor (GLP-1R) antagonistic and GLP-1R-mediated signaling inhibiting activities. Upon administration, exendin 9-39 competitively binds to and inhibits the activity of GLP-1R, thereby inhibiting GLP-1/GLP-1R-mediated signaling. This antagonizes the glucagonostatic and the insulinotropic effects of GLP-1. By abrogating GLP-1-mediated simulation of insulin release and reduction of glucagon secretion after food intake, exendin 9-39 may be used to help study the potential effects of overproduction of GLP-1 on food intake, weight loss and glucose levels. GLP-1R, located on pancreatic beta cells, is overexpressed on certain tumor cell types. GLP-1 is a gastrointestinal (GI) and insulinotropic hormone that is released after a meal and plays a key role in the regulation of blood glucose levels. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C133230\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C133230\' NCI Thesaurus)
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