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REVIEW ARTICLES

Mitogen-activated protein kinase phosphatase-1 and septic shock

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Pages 66-78 | Published online: 11 Jul 2009
 

Abstract

Mitogen-activated protein (MAP) kinase cascades are crucial signal transduction pathways in the biosynthesis of pro-inflammatory cytokines. MAP kinase phosphatase (MKP)-1, an archetypal member of the MKP family, plays a pivotal role in the feedback control of p38 and c-Jun N-terminal kinase (JNK). In vitro studies using cultured macrophages have provided strong evidence for a critical role of MKP-1 in the restraint of pro-inflammatory cytokine biosynthesis. Recently, a number of studies conducted using MKP-1 knockout mice have verified the importance of MKP-1 in the regulation of p38 and JNK and also in the regulation of pro-inflammatory cytokine synthesis. Upon lipopolysaccharide challenge, MKP-1 knockout mice produced dramatically greater amounts of inflammatory cytokines, developed severe hypotension, and multi-organ failure, and exhibited a remarkable increase in mortality. These studies demonstrate that MKP-1 is an essential feedback regulator of the innate immune response, and that it plays a critical role in preventing septic shock and multi-organ dysfunction during pathogenic infection.

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