Objective:The aim of this study was to study the cisplatin sensitizing effect and mechanism of anti-HPV16 E6-ribozyme on cervical carcinoma cell line.Methods:The anti-HPV16E6-ribozyme and empty eucaryotic expressing plasmids were transfected into CaSKi cell,which named as CaSKi-R,CaSKi-P respectively.E6 mRNA,the sensitivity to cisplatin,apoptosis rates,expression of p53,Bcl-2,Bax and C-myc proteins and mRNA were examined by Northern blot,MTT colorimetric assay,PI/Annexin V stained methods,flow cytometry anslysis and RT-PCR,respectively.Results:E6 mRNA was less in CaSKi-R than in CaSKi.The sensitivity of CaSKi-R cells to cisplatin was 2.28 and 2.21 times than that of CaSKi and CaSKi-P cells.The apoptotic rates in CaSKi,CaSKi-P and CaSKi-R cells was (18.9 ± 3.5)%,(19.7 ± 4.8)% and (40.4 ± 4.5)%.The apoptotic rates was increased in CaSKi-R than that of CaSKi cells treated with cisplatin (P=0.003).Comapred with CaSKi cell,the expression of p53 (P=0.000),Bax protein (P=0.002) was significantly higher and the expression of Bcl-2 protein (P=0.005),C-myc protein (P=0.005) was significantly lower in CaSKi-R than that of CaSKi cell treated with cisplatin.Comapred with CaSKi cell,the expression of p53,Bax mRNA in CaSKi-R cell treated with cisplatin increased,while Bcl-2,C-myc mRNA decreased.Conclusion:CaSKi-R cells transfected by anti-HPVE6-ribozyme increased the sensitivity to cisplatin.The increase of sensitivity to cisplatin in CaSKi-R cells may be associated with increasing expression of p53,Bax protein,and decreasing expression of C-myc,Bcl-2 proteins.
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