Abstract
To investigate the role of transforming growth factor-β-induced (TGFBI) in metastasis of renal cell carcinoma (RCC) and the associations between TGFBI expression and von Hippel-Lindau (VHL) status. In null type VHL cells stably transfected with the VHL vector, the expression of VHL in cells with wild type VHL was decreased by siRNA. We investigated the effects of hypoxia-inducible transcription factor (HIF) on TGFBI in RCC cells by decreasing the expression levels of HIF-1α and HIF-2α through siRNA. The secretion of transforming growth factor-β1 (TGF-β1) in RCC cells with different VHL status was analyzed by enzyme-linked immunosorbent assay. The role of TGFBI in metastasis and the effect of VHL activation on TGFBI-induced adhesion, migration, and invasion in RCC cells were examined using matrigel, chemotaxis, and the transwell system, respectively. Our results suggested that TGF-β1 and TGFBI might be targets of VHL, and the suppression of TGFBI by VHL is not by way of the HIF-1α or HIF-2α pathway. The expression of TGFBI was significantly enhanced by TGF-β1 in VHL-inactive RCC cells compared with VHL-active cells. In addition, these results indicate that TGFBI participated in the adhesion, migration, and invasion of RCC cells,...Continue Reading
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