Transforming growth factor-β (TGF-β) signals through both SMAD and non-SMAD pathways to elicit a wide array of biological effects. Existing data have shown the association and coordination between STATs and SMADs in mediating TGF-β functions in hepatic cells, but it is not clear how STATs are activated under these circumstances. Here, we report that JAK1 is a constitutive TGFβRI binding protein and is absolutely required for phosphorylation of STATs in a SMADs-independent manner within minutes of TGF-β stimulation. Following the activation of SMADs, TGF-β also induces a second phase of STAT phosphorylation that requires SMADs, de novo protein synthesis, and contribution from JAK1. Our global gene expression profiling indicate that the non-SMAD JAK1/STATs pathway is essential for the expression of a subset of TGF-β target genes in hepatic stellate cells, and the cooperation between JAK1-STAT3 and SMADs pathways is critical to the roles of TGF-β in liver fibrosis.
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