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Expression and localization of the activated mitogen-activated protein kinase in lesional psoriatic skin.

Abstract：

:Abnormalities in several signaling pathways and in the expression and/or activation of different transcription factors in psoriatic keratinocytes have been hypothesized to play a role in the pathophysiology of psoriasis. The mitogen-activated protein kinase (MAPK) cascades are among the best characterized of intracellular signaling pathways, and they play important roles in cell proliferation, differentiation, gene expression, and inflammation. We investigated the expression, activation and distribution of extracellular signal-regulated kinases (ERKs), p38 mitogen-activated protein kinases (p38 MAPK) and c-Jun N-terminal kinases (JNKs), using immunohistochemistry and Western blot in lesional psoriatic skin and normal control skin, to clarify the possible roles of these kinases involved in the pathogenesis of psoriasis. The immunoblot analysis demonstrated that activation of ERK1/2 and p38 MAPK increased in the lesional psoriatic skin. In addition, a significant increase in p-MEK (the upstream activator of ERK), and p-CREB (a downstream transcription factor of active ERK) was also found in our experiment. The immunohistochemical study showed that the levels of phosphorylated ERK1/2 and p38 MAPK were enhanced in lesional psoriatic skin compared with controls. Phosphorylated ERK1/2 and p38 exhibited clear nuclear localization throughout the epidermal part of lesional psoriatic skin. These findings suggested that ERK1/2 and p38 pathways were involved in the pathophysiology of psoriasis.

journal_name

Exp Mol Pathol

journal_title

Experimental and molecular pathology

authors

Yu XJ,Li CY,Dai HY,Cai DX,Wang KY,Xu YH,Chen LM,Zhou CL

doi

10.1016/j.yexmp.2007.05.002

subject

Has Abstract

pub_date

2007-12-01 00:00:00

pages

413-8

issue

3

eissn

0014-4800

issn

1096-0945

pii

S0014-4800(07)00076-7

journal_volume

83

pub_type

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