alexa GLP-1-derived nonapeptide GLP-1(28-36)amide targets to mitochondria and suppresses glucose production and oxidative stress in isolated mouse hepatocytes.
Infectious Diseases

Infectious Diseases

Journal of AIDS & Clinical Research

Author(s): Tomas E, Stanojevic V, Habener JF, Tomas E, Stanojevic V, Habener JF

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Abstract BACKGROUND: Uncontrolled hepatic glucose production (gluconeogenesis), and glycogenolysis, is a major contributor to the fasting hyperglycemia associated with type 2 diabetes. Here we report the discovery of a C-terminal nonapeptide (FIAWLVKGRamide) derived from GLP-1 that suppresses glucose production and oxidative stress in isolated mouse hepatocytes. The nonapeptide, GLP-1(28-36)amide, was reported earlier to be a major product derived from the cleavage of GLP-1 by the endopeptidase NEP 24.11. METHODS AND RESULTS: Hepatocytes were isolated from the livers of normal and diet-induced obese mice. We find that the GLP-1(28-36)amide nonapeptide rapidly enters isolated mouse hepatocytes by GLP-1 receptor-independent mechanisms, and targets to mitochondria where it inhibits gluconeogenesis and oxidative stress. CONCLUSIONS: These findings suggest that GLP-1 not only acts on a cell surface G-protein coupled receptor activating kinase-regulated signaling pathways, but a small C-terminal peptide derived from GLP-1 also enters cells, targets mitochondria, and exerts insulin-like actions by modulating oxidative phosphorylation. GLP-1(28-36)amide, or a peptide mimetic derived there from, might prove to be a useful treatment for fasting hyperglycemia and metabolic syndrome in type 2 diabetes. 2011 Elsevier B.V. All rights reserved. This article was published in Regul Pept and referenced in Journal of AIDS & Clinical Research

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