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Volume 271, Number 8, Issue of February 23, 1996 pp. 4138-4142
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.
Activation of Mitogen-activated Protein Kinase by HO
ROLE IN CELL SURVIVAL FOLLOWING OXIDANT INJURY

(Received for publication, November 6, 1995; and in revised form, December 13, 1995)

Kathryn Z. Guyton Yusen Liu Myriam Gorospe Qingbo Xu Nikki J. Holbrook

The mitogen-activated protein kinase (MAPK) family is comprised of key regulatory proteins that control the cellular response to both proliferation and stress signals. In this study we investigated the factors controlling MAPK activation by H(2)O(2) and explored the impact of altering the pathways to kinase activation on cell survival following H(2)O(2) exposure. Potent activation (10-20-fold) of extracellular signal-regulated protein kinase (ERK2) occurred within 10 min of H(2)O(2) treatment, whereupon rapid inactivation ensued. H(2)O(2) activated ERK2 in several cell types and also moderately activated (3-5-fold) both c-Jun N-terminal kinase and p38/RK/CSBP. Additionally, H(2)O(2) increased the mRNA expression of MAPK-dependent genes c-jun, c-fos, and MAPK phosphatase-1. Suramin pretreatment completely inhibited H(2)O(2) stimulation of ERK2, highlighting a role for growth factor receptors in this activation. Further, ERK2 activation by H(2)O(2) was blocked by pretreatment with either N-acetyl-cysteine, o-phenanthroline, or mannitol, indicating that metal-catalyzed free radical formation mediates the initiation of signal transduction by H(2)O(2). H(2)O(2)-stimulated activation of ERK2 was abolished in PC12 cells by inducible or constitutive expression of the dominant negative Ras-N-17 allele. Interestingly, PC12/Ras-N-17 cells were more sensitive than wild-type PC12 cells to H(2)O(2) toxicity. Moreover, NIH 3T3 cells expressing constitutively active MAPK kinase (MEK, the immediate upstream regulator of ERK) were more resistant to H(2)O(2) toxicity, while those expressing kinase-defective MEK were more sensitive, than cells expressing wild-type MEK. Taken together, these studies provide insight into mechanisms of MAPK regulation by H(2)O(2) and suggest that ERK plays a critical role in cell survival following oxidant injury.




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