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Focal adhesion molecule Kindlin-1 mediates activation of TGF-? signaling by interacting with TGF-?RI, SARA and Smad3 in colorectal cancer cells #MMPMID27776350
Kong J; Du J; Wang Y; Yang M; Gao J; Wei X; Fang W; Zhan J; Zhang H
Oncotarget 2016[Nov]; 7 (46): 76224-37 PMID27776350show ga
Kindlin-1, an integrin-interacting protein, has been implicated in TGF-?/Smad3 signaling. However, the molecular mechanism underlying Kindlin-1 regulation of TGF-?/Smad3 signaling remains elusive. Here, we reported that Kindlin-1 is an important mediator of TGF-?/Smad3 signaling by showing that Kindlin-1 physically interacts with TGF-? receptor I (T?RI), Smad anchor for receptor activation (SARA) and Smad3. Kindlin-1 is required for the interaction of Smad3 with T?RI, Smad3 phosphorylation, nuclear translocation, and finally the activation of TGF-?/Smad3 signaling pathway. Functionally, Kindlin-1 promoted colorectal cancer (CRC) cell proliferation in vitro and tumor growth in vivo, and was also required for CRC cell migration and invasion via an epithelial to mesenchymal transition. Kindlin-1 was found to be increased with the CRC progression from stages I to IV. Importantly, raised expression level of Kindlin-1 correlates with poor outcome in CRC patients. Taken together, we demonstrated that Kindlin-1 promotes CRC progression by recruiting SARA and Smad3 to T?RI and thereby activates TGF-?/Smad3 signaling. Thus, Kindlin-1 is a novel regulator of TGF-?/Smad3 signaling and may also be a potential target for CRC therapeutics.