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• W2158677462 abstract "We have previously demonstrated that activation of the Ras/Mapk pathways is required for transforming growth factor beta (TGF-beta) induction of TGF-beta(1) expression. Here we examined the role of the Ras/Mapk pathways in TGF-beta induction of urokinase-type plasminogen activator receptor (uPAR) expression in untransformed intestinal epithelial cells (IECs). TGF-beta activated the stress-activated protein kinases (Sapk)/c-Jun N-terminal kinases (JNKs) within 5-10 min, an effect that preceeded TGF-beta induction of uPAR expression in these cells. TGF-beta induction of both JNK1 activity and JunD phosphorylation was blocked by expression of a dominant-negative mutant of the type II TGF-beta receptor (DN TbetaRII), a dominant-negative mutant of MKK4 (DN MKK4), or a dominant-negative mutant of Ras (RasN17), or by the addition of the JNK inhibitor SP600125. TGF-beta also induced AP-1 complex formation at the distal AP-1 site (-184 to -178) of the uPAR promoter within 2 h of TGF-beta addition, consistent with the time-dependent up-regulation of uPAR expression. The primary components present in the TGF-beta-stimulated AP-1 complex bound to the uPAR promoter were Jun D and Fra-2. Moreover, addition of SP600125, or expression of DN MKK4 or DN TbetaRII, blocked TGF-beta up-regulation of uPAR in IECs. Accordingly, our results indicate that TGF-beta activates the Ras/MKK4/JNK1 signaling cascade, leading to induction of AP-1 activity, which, in turn, up-regulates uPAR expression. Our results also indicate that the type II TGF-beta receptor (RII) is required for TGF-beta activation of JNK1 and the resulting up-regulation of uPAR expression." @default.
• W2158677462 created "2016-06-24" @default.
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• W2158677462 date "2003-12-08" @default.
• W2158677462 modified "2023-10-10" @default.
• W2158677462 title "Requirement of TGF-? receptor-dependent activation of c-Jun N-terminal kinases (JNKs)/stress-activated protein kinases (Sapks) for TGF-? up-regulation of the urokinase-type plasminogen activator receptor" @default.
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• W2158677462 doi "https://doi.org/10.1002/jcp.10469" @default.
• W2158677462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15040011" @default.
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