J Biol Chem. 2004 Mar 12;279(11):10442-9. Epub 2003 Dec 19.

Activation of apoptosis signal-regulating kinase 1 by reactive oxygen species through dephosphorylation at serine 967 and 14-3-3 dissociation.

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Department of Pharmacology, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

Abstract

Oxidative stress has been indicated in a variety of pathological processes such as atherosclerosis, diabetes, and neurodegenerative diseases. Understanding how intracellular signaling pathways respond to oxidative insults such as hydrogen peroxide (H(2)O(2)) would have significant therapeutic implications. Recent genetic studies have placed apoptosis signal-regulating kinase 1 (ASK1) in a pivotal position in transmitting H(2)O(2)-initiated signals. How ASK1 is activated by H(2)O(2), though, remains a subject of intense investigation. Here we report a mechanism by which H(2)O(2) induces ASK1 activation through dynamic control of its phosphorylation at serine 967. We found that treatment of COS7 cells with H(2)O(2) triggers dephosphorylation of Ser-967 through an okadaic acid-sensitive phosphatase, resulting in dissociation of the ASK1.14-3-3 complex with concomitant increase of ASK1 catalytic activity and ASK1-mediated activation of JNK and p38 pathways.

PMID:: 14688258; [PubMed - indexed for MEDLINE]

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