Study of a novel insulin signaling network mediated by GAPDH in H9c2 cardiac cell line

2012 Fiscal Year Final Research Report

• Project/Area Number: 23700843
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied health science
• Research Institution: Juntendo University
• Principal Investigator: BABA Takeshi 順天堂大学, 医学部, 准教授 (80366450)
• Project Period (FY): 2011 – 2012
• Keywords: 心筋 / インスリン / 2 型糖尿病 / 翻訳後修飾

Research Abstract

In the rat cardiomyocyte-derived cell line H9c2 it has been shown that phosphorylation of GAPDH,one of the glycolytic enzymes, was induced by insulin treatment. In this study, GAPDH nitration and its association with actin were both induced by insulin treatment before the GAPDH phosphorylationresponse to insulin stimulation in the H9c2 cell line. Moreover, after treatment of the cell line with insulin, accumulation of GAPDH protein in the nucleus was observed. We also demonstrated the possibility that insulin signaling mediated by GAPDH was impaired in the heart of type 2 diabetic rat. These results suggest that GAPDH may play a key role in insulin signal transduction in cardiac muscle.