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Signal Transduction in TNF-alpha-induced c-jun Gene Expression.
Our previous studies demonstrated that p38 mitogen-activated protein (MAP) kinase regulated the c-jun protein expression through phosphorylation of transcription factors of myocyte enhancer factors 2 (MEF2) family. There was a MEF2 binding site in the promoter of c-jun gene. Members of the MEF2 family of trans-cription factors bound as homo- and heterodimers to this MEF2 binding site. Here the potential role of the p38 and BMK1 MAP kinases in the regulation of c-jun expression induced by TNF-alpha was examined. It was shown that p38 MAP kinase up-regulated the transcription activity of MEF2A, while BMK1 MAP kinase up-regulated not only the transcription activity of MEF2A, but also MEF2D. The p38 and BMK1 MAP kinases had coordinated effect on the regulation of c-jun transcription. TNF-alpha induced the formation of MEF2A/MEF2D hete-rodimer. Over-expression of homodimer of MEF2 proteins inhibited c-jun transcription induced by TNF-alpha, while over-expression of heterodimer MEF2A/MEF2D enhanced c-jun transcription induced by TNF-alpha. Phosphorylation of MEF2A and MEF2D by p38 and BMK1 respectively appeared very important in TNF-alpha induced MEF2A/MEF2D heterodimer formation to enhance c-jun gene expression.
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