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A mitogenic signal triggered at an early stage of vaccinia virus infection: implication of MEK/ERK and protein kinase A in virus multiplication. 总被引:10,自引:0,他引:10
J C de Magalh?es A A Andrade P N Silva L P Sousa C Ropert P C Ferreira E G Kroon R T Gazzinelli C A Bonjardim 《The Journal of biological chemistry》2001,276(42):38353-38360
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The transforming growth factor (TGF)-beta signal-transduction cascade from the cell membrane to the nuclear target is poorly characterised. Here we report that treatment with TGF-beta1 induces the levels of endogenous c-fos mRNA in Rat-2 fibroblast cells. In addition, by transient transfection analysis, TGF-beta1 was shown to stimulate c-fos serum response element (SRE)-driven reporter gene activity in a dose- and time-dependent manner, suggesting that SRE is one of the nuclear targets of TGF-beta1. To understand the signalling cascade by which TGF-beta1 mediates the transactivation of c-fos SRE, cells were either pre-treated with various inhibitors or co-transfected with expression plasmids encoding inhibitory proteins for Rho GTPase together with the SRE-luciferase reporter gene. Our results showed that an inhibition of protein kinase C (PKC) or RhoA selectively repressed the stimulation of c-fos SRE by TGF-beta1, implying the possible roles of PKC and RhoA GTPase in TGF-beta1-induced signalling to c-fos SRE. 相似文献
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