RESUMO
<p><b>OBJECTIVE</b>To investigate the role of Stat1 gene in the proliferation and chemotherapeutic sensitivity of cervical cancer HeLa cells.</p><p><b>METHODS</b>The protein expression of Stat1 in the Hela cells exposed to gradient concentrations of cisplatin (DDP) was detected by Western blotting with or without small interfering RNA (siRNA)-mediated Stat1 gene silencing. The effect of Sata1 silencing on the sensitivity to DDP and cell proliferation of the cells was tested using MTT assay and BrdU assay, and the expression of c-Myc was detected by Western blotting in the cells treated with siRNA and DDP.</p><p><b>RESULTS</b>The expression of Stat1 in Hela cells exposed to DDP increased with the DDP concentrations, reaching 1.5 folds of the baseline at a DDP concentration of 5 mg/L and 2 folds at 10 mg/L. Stat1-siRNA effectively reduced Stat1 expression in Hela cells, promoted the cell proliferation, and enhanced the expression of c-Myc; DDP inhibited the cell growth and down-regulated c-Myc expression. Stat1-siRNA rescued DDP-induced inhibition of cell growth and c-Myc down-regulation.</p><p><b>CONCLUSION</b>The expression of Stat1 is associated with DDP sensitivity in cervical cancer cells, and Stat1 silencing can increase the sensitivity to DDP and c-Myc expression of the cells.</p>