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Cited by 261

The DOI matches its Crossref record; 9 of the 9 references it cites were found in a registry or an index.

S-Nitrosylation-dependent Inactivation of Akt/Protein Kinase B in Insulin Resistance

Open access
Yasukawa, Takashi, Tokunaga, Eriko, Ota, Hidetaka, Sugita, Hiroki, Martyn, J. A. Jeevendra, Kaneki, Masao·2005·Journal of Biological Chemistry

Abstract

Inducible nitric-oxide synthase (iNOS) has been implicated in many human diseases including insulin resistance. However, how iNOS causes or exacerbates insulin resistance remains largely unknown. Protein S-nitrosylation is now recognized as a prototype of a redox-dependent, cGMP-independent signaling component that mediates a variety of actions of nitric oxide (NO). Here we describe the mechanism of inactivation of Akt/protein kinase B (PKB) in NO donor-treated cells and diabetic (db/db) mice. NO donors induced S-nitrosylation and inactivation of Akt/PKB in vitro and in intact cells. The inhibitory effects of NO donor were independent of phosphatidylinositol 3-kinase and cGMP. In contrast, the concomitant presence of oxidative stress accelerated S-nitrosylation and inactivation of Akt/PKB. In vitro denitrosylation with reducing agent reactivated recombinant and cellular Akt/PKB from NO donor-treated cells. Mutated Akt1/PKBalpha (C224S), in which cysteine 224 was substituted by serine, was resistant to NO donor-induced S-nitrosylation and inactivation, indicating that cysteine 224 is a major S-nitrosylation acceptor site. In addition, S-nitrosylation of Akt/PKB was increased in skeletal muscle of diabetic (db/db) mice compared with wild-type mice. These data suggest that S-nitrosylation-mediated inactivation may contribute to the pathogenesis of iNOS- and/or oxidative stress-involved insulin resistance.

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Crossref · 10.1074/jbc.m411871200

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Metadata

Authors
Yasukawa, T., Tokunaga, E., Ota, H., Sugita, H., Martyn, J. A. J., & Kaneki, M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-03
Volume
280
Issue
9
Pages
7511-7518
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2094054841
Cited by
261
References
9
FWCI
5.07
Type
journal article
Language
en
Open access
hybrid

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