PubMed:12058028 JSONTXT

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We now demonstrate that the increase in p21 abundance is caused by a post-transcriptional, SMAD-independent mechanism. TGF-beta1 activated p38 alpha and JNK1, which initiated the phosphorylation of p21. TGF-beta1 treatment increased the half-life of p21 by 3-4-fold. The increase in p21 stability was detected following activation of p38 alpha and JNK1, and treatment of cells with the p38 inhibitor SB203580 prevented this increase in p21 stability. p38 alpha and JNK1 phosphorylated p21 in vivo, and both p38 alpha and JNK1 phosphorylated p21 at Ser(130) in vitro. Peptide mapping demonstrated that both TGF-beta 1 and p38 alpha induced phosphorylation of p21 at Ser(130) in vivo, and mutation of Ser(130) to alanine rendered p21 less stable than wild-type p21. TGF-beta 1 increased the stability of wild-type p21, but not the p21-S130A mutant. 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