Effect of mutant p27kip1 gene on human cholangiocarcinoma cell line, QBC939

AIM:To investigate the effects of exogenously mutated p27kip1 (p27) on proliferation and apoptosis of human cholangiocarcinoma cell line,QBC939 in vivo.METHODS:Adenviral vectors were used to transfect mutated p27 cDNA into human QBC939 cell line.Expression of p27 was detected by RT-PCR.Western blot.Cell growth,morphological change,cell cycle,apoptosis and cloning formation were determined by MTT assay and flow cytometry.RESULTS:The expression of p27 protein and mRNA was increased significantly in QBC939 cell line transfected with Ad-p27mt.The transfer of Adp27mt could significantly inhibit the growth of QBC939cells,decrease the cloning formation rate and induce apoptosis,p27 over expression caused cell cycle arrest at G0/G1 phase 72 h after infection with Adp27mt.CONCLUSION:p27 may cause cell cycle arrest at G0/G1 phase and subsequently lead to apoptosis.Recombinant adenovirus expressing mutant p27 may be potentially useful in gene therapy for cholangiocarcinoma.