1. Amelioration of hyperglycemia by intestinal overexpression of glucagon-like peptide-1 in mice.
- Author
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Meng-Ju Liu, Jaeseok Han, Young-Sun Lee, Mi-Sung Park, Seungjin Shin, and Hee-Sook Jun
- Subjects
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HYPERGLYCEMIA , *GLUCAGON , *BODY weight , *MESSENGER RNA , *BLOOD sugar , *INSULIN - Abstract
To investigate whether the local production of glucagon-like peptide-1 (GLP-1) in the intestine can differentiate intestinal stem/progenitor cells into insulin-producing cells, we intra-intestinally injected a recombinant adenovirus expressing GLP-1 (rAd-GLP-1) into diabetic mice. There were no significant differences in body weight or food intake between rAd-GLP-1- and rAd-βGAL-treated control mice. rAd-GLP-1-treated mice showed intestinal insulin mRNA expression, insulin- and glucagon-positive cells in the intestine, and significantly increased serum insulin, but not glucagon. rAd-GLP-1 injection significantly reduced blood glucose levels and improved glucose tolerance compared with controls. Expression of transcription factors related to β cell differentiation, neurogenin3 (ngn3) and neurogenin differentiation factor (NeuroD), was detected in the intestine at 2 weeks after rAd-GLP-1 injection. We suggest that expression of GLP-1 in the intestine by intra-intestinal delivery of rAd-GLP-1 may induce differentiation of intestinal stem/progenitor cells into insulin-producing cells, mediated by ngn3 and NeuroD expression, contributing to lowered blood glucose levels in diabetic mice. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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