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Pancreatic beta cells require NeuroD to achieve and maintain functional maturity

Item Type:Article
Title:Pancreatic beta cells require NeuroD to achieve and maintain functional maturity
Creators Name:Gu, C. and Stein, G.H. and Pan, N. and Goebbels, S. and Hörnberg, H. and Nave, K.A. and Herrera, P. and White, P. and Kaestner, K.H. and Sussel, L. and Lee, J.E.
Abstract:NeuroD, a transactivator of the insulin gene, is critical for development of the endocrine pancreas, and NeuroD mutations cause MODY6 in humans. To investigate the role of NeuroD in differentiated beta cells, we generated mice in which neuroD is deleted in insulin-expressing cells. These mice exhibit severe glucose intolerance. Islets lacking NeuroD respond poorly to glucose and display a glucose metabolic profile similar to immature beta cells, featuring increased expression of glycolytic genes and LDHA, elevated basal insulin secretion and O(2) consumption, and overexpression of NPY. Moreover, the mutant islets appear to have defective K(ATP) channel-mediated insulin secretion. Unexpectedly, virtually all insulin in the mutant mice is derived from ins2, whereas ins1 expression is almost extinguished. Overall, these results indicate that NeuroD is required for beta cell maturation and demonstrate the importance of NeuroD in the acquisition and maintenance of fully functional glucose-responsive beta cells.
Keywords:Basic Helix-Loop-Helix Transcription Factors, Glucose, Insulin, Insulin Secretion, Insulin-Secreting Cells, KATP Channels, Nerve Tissue Proteins, Neuropeptide Y, Oxygen Consumption, Protein Array Analysis, Animals, Mice
Source:Cell Metabolism
Publisher:Cell Press
Page Range:298-310
Date:7 April 2010
Official Publication:https://doi.org/10.1016/j.cmet.2010.03.006
PubMed:View item in PubMed

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