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c-Jun-NH2 terminal kinase (JNK)-mediates AP-1 activation by thioredoxin: phosphorylation of cJun, JunB, and Fra-1.

Abstract：

:Thioredoxin (Trx) is a small ubiquitous protein, which has been shown to be involved in redox-dependent cellular functions. In this article, we demonstrate that the increased level of Trx induces AP-1 DNA binding in a redox-dependent manner by activating JNK subgroup of MAPKs. The majority of AP-1 DNA binding complex was found to be composed of cJun, JunB, and Fra-1. Increased expression of Trx resulted in phosphorylation of cJun, Jun B, and Fra-1. Further, increased expression of Trx induced the phosphorylation of MKK4 and MKK7 which are upstream kinases of the JNK signaling cascade. In co-transfection studies, AP-1-dependent luciferase reporter vector and pcDNA3-Trx increased luciferase activity demonstrating that increased expression of Trx increases AP-1 transactivation. In addition, dominant-negative JNK kinase (dnJNK/MKK4) or dominant-negative JNK (dnJNK) inhibited Trx-mediated AP-1 transactivation, as well as AP-1 DNA binding. Furthermore, transfection of kinase-dead MEKK1, an initiating kinase of the JNK pathway inhibited Trx-mediated AP-1 transactivation and DNA binding, suggesting that MEKK1 may mediate Trx-induced AP-1 activation. In contrast, wild-type MEKK1 overexpression did not inhibit Trx-mediated AP-1 activation. Taken together, our data demonstrate that increased expression of Trx induces MKK4/MKK7-dependent JNK activation, resulting in enhanced DNA binding, and transactivation of AP-1 transcription factor.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Das KC,Muniyappa H

doi

10.1007/s11010-009-0285-0

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

53-63

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

337

pub_type

杂志文章

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