title: RNA-interference-mediated Cdc42 silencing down-regulates phosphorylation of STAT3 and suppresses growth in human bladder-cancer cells.
abstract: Cdc42 (cell division cycle 42), a member of Rho GTPases, is involved in cell transformation, proliferation, survival, invasion and metastasis of human cancer cells. Here, RNAi (RNA interference)-mediated gene silencing was used to investigate the roles of Cdc42 and to assess its therapeutic potential in human bladder cancer. The results showed that Cdc42 silencing resulted in a marked reduction of Cdc42 mRNA and protein expression and a significant inhibition of cell proliferation from G(0)/G(1)- to S-phase in two (EJ and T24) human bladder-cancer cell lines. Moreover, RNAi-mediated inhibition of Cdc42 induced apoptosis of EJ cells 96 h after transfection. In addition, we found that silencing of Cdc42 could down-regulate the level of phosphorylated STAT3 (signal transducer and activator of transcription 3), but did not influence the level of total STAT3 in the two bladder-cancer cell lines. These results suggest that RNAi-mediated Cdc42 silencing may be a novel approach for gene therapy of bladder cancer.
authors: Department of Biochemistry and Molecular Biology, School of Life Science, Lanzhou University, Lanzhou 730000, PR China.
authors: Fuguo
authors: F
authors: Wu
authors: Yirong
authors: Y
authors: Chen
authors: Yuan
authors: Y
authors: Li
authors: Jun
authors: J
authors: Ju
authors: Zhiping
authors: Z
authors: Wang
authors: Dongwen
authors: D
authors: Yan
mesh_terms: D002453:Cell Cycle / Q000235:genetics; D002460:Cell Line; D049109:Cell Proliferation; D015536:Down-Regulation; D006801:Humans; D010766:Phosphorylation; D034622:RNA Interference; D050796:STAT3 Transcription Factor / Q000378:metabolism*; D001749:Urinary Bladder Neoplasms / Q000473:pathology* / Q000503:physiopathology*; D020764:cdc42 GTP-Binding Protein / Q000378:metabolism*
chemical_list: D050796:STAT3 Transcription Factor; D020764:cdc42 GTP-Binding Protein