Reactive oxygen species control senescence-associated matrix metalloproteinase-1 through c-Jun-N-terminal kinase.

Journal of Cellular Physiology
Jaya DasguptaJ Andrés Melendez

Abstract

The lifetime exposure of organisms to oxidative stress influences many aging processes which involve the turnover of the extracellular matrix. In this study, we identify the redox-responsive molecular signals that drive senescence-associated (SA) matrix metalloproteinase-1 (MMP-1) expression. Precise biochemical monitoring revealed that senescent fibroblasts increase steady-state (H(2)O(2)) 3.5-fold (13.7-48.6 pM) relative to young cells. Restricting H(2)O(2) production through low O(2) exposure or by antioxidant treatments prevented SA increases in MMP-1 expression. The H(2)O(2)-dependent control of SA MMP-1 is attributed to sustained JNK activation and c-jun recruitment to the MMP-1 promoter. SA JNK activation corresponds to increases and decreases in the levels of its activating kinase (MKK-4) and inhibitory phosphatase (MKP-1), respectively. Enforced MKP-1 expression negates SA increases in JNK phosphorylation and MMP-1 production. Overall, these studies define redox-sensitive signaling networks regulating SA MMP-1 expression and link the free radical theory of aging to initiation of aberrant matrix turnover.

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