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- W1967764472 abstract "Interferon consensus sequence binding protein (ICSBP), also known as interferon regulatory factor (IRF)-8, is a member of the interferon (IFN)-γ regulatory transcription factors. Studies have suggested a connection between TGF-β signaling and IRFs. Thus, we investigated the effect of ICSBP on transforming growth factor (TGF)-β signaling in HL-60, an acute promyelocytic leukemia cell line. Stable expression of ICSBP in HL-60 cells resulted in strong induction of TGF-β receptor expression and activation of non-Smad as well as Smad pathways. ICSBP expression also augmented cell growth. ICSBP knockdown with small interfering RNA (siRNA) attenuated cell growth and decreased TGF-β receptor I (TGF-βRI) expression. In addition, reduction of TGF-βRI using siRNA or pharmacological inhibitor reduced growth of ICSBP-expressing cells. ICSBP expression also led to increased phosphorylation and activation of Akt and p38 MAPK. However, p38 MAPK, but not PI3K-Akt, inhibition abrogated ICSBP-mediated proliferation. Furthermore, siRNA knockdown of either ICSBP or TGF-βRI resulted in decreased p38 activation. Intriguingly, TGF-β-activated kinase 1 (TAK-1), which phosphorylates p38, was activated in ICSBP-expressing cells and its activity was reduced by TGF-βRI inhibition. Finally, siRNA knockdown of ICSBP or TGF-βRI reduced TAK-1 phosphorylation. This study identifies a novel role for ICSBP in regulating cell growth via TGF-β receptor upregulation and subsequent activation of the TGF-β receptor/TAK-1/p38 pathway." @default.
- W1967764472 created "2016-06-24" @default.
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- W1967764472 date "2011-09-01" @default.
- W1967764472 modified "2023-10-16" @default.
- W1967764472 title "Interferon consensus sequence binding protein-induced cell proliferation is mediated by TGF-β signaling and p38 MAPK activation" @default.
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- W1967764472 doi "https://doi.org/10.1038/labinvest.2011.90" @default.
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