Free Fatty Acid-induced Muscle Insulin Resistance and Glucose Uptake Dysfunction: Evidence for PKC Activation and Oxidative Stress-activated Signaling Pathways

Overview

Journal Biochem Biophys Res Commun

Publisher Elsevier

Specialty Biochemistry

Date 2009 Aug 27

PMID 19706288

Citations 41

Authors

Rafik Ragheb

Gamila M L Shanab

Amina M Medhat

Dina M Seoudi

K Adeli

I G Fantus

Affiliations

Soon will be listed here.

Abstract

In the present study, we examined the effects of free fatty acids (FFAs) on insulin sensitivity and signaling cascades in the C2C12 skeletal muscle cell culture system. Our data clearly manifested that the inhibitory effects of PKC on insulin signaling may at least in part be explained by the serine/threonine phosphorylation of IRS-1. Both oleate and palmitate treatment were able to increase the Serine(307) phosphorylation of IRS-1. IRS-1 Serine(307) phosphorylation is inducible which causes the inhibition of IRS-1 tyrosine phosphorylation by either IkappaB-kinase (IKK) or c-jun N-terminal kinase (JNK) as seen in our proteomic kinases screen. Furthermore, our proteomic data have also manifested that the two FFAs activate the IKKalpha/beta, the stress kinases S6 kinase p70 (p70SK), stress-activated protein kinase (SAPK), JNK, as well as p38 MAP kinase (p38MAPK). On the other hand, the antioxidant, Taurine at 10mM concentrations was capable of reversing the oleate-induced insulin resistance in myocytes as manifested from the glucose uptake data. Our current data point out the importance of FFA-induced insulin resistance via multiple signaling mechanisms.

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