Abstract
COUP-TFII belongs to the nuclear receptor family, which is highly expressed in many kinds of tumors. Previous studies have shown that COUP-TFII can promote tumor progression through regulating tumor angiogenesis and cell proliferation and migration of certain cancer cells. However, the function of COUP-TFII in renal cell carcinoma (RCC) is not clear. Here, we showed that clinical RCC tumor tissues showed much higher COUP-TFII expression level than adjacent normal tissues. When COUP-TFII was knocked down in RCC 769-P and 786-O cells by siRNA or shRNA-expressing lentivirus, the cell proliferation was markedly inhibited, and apoptosis increased. Moreover, the tumor growth of COUP-TFII knockdown 769-P and 786-O xenografts in nude mice was also obviously inhibited. Using qRT-PCR and Western blot, we showed that the expression of the tumor suppressor gene BRCA1 was upregulated in COUP-TFII knockdown cells. Simultaneously knockdown of BRCA1 and COUP-TFII partially rescued the inhibited cell proliferation and increased apoptosis in COUP-TFII single knockdown cells. These results indicate that COUP-TFII may play an oncogenic role in RCC, and COUP-TFII may promote tumor progression through inhibiting BRCA1.
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