小剂量顺铂增加人宫颈癌Hela和Siha细胞对光动力治疗敏感性的研究

Enhancement of photodynamic therapy sensitivity by cisplatin in human cervical carcinoma cell lines

目的探讨小剂量顺铂增加人宫颈癌Hela和Siha细胞系对光动力治疗的敏感性及细胞凋亡的机理。方法将Hela和Siha细胞分为空白对照组、单纯光动力治疗组、单纯顺铂治疗组和光动力加顺铂治疗组,MTT法检测各组人宫颈癌细胞株Hela和Siha的增殖情况。采用免疫细胞化学法检测各组Hela和Siha细胞受作用后P185c-erbB-2蛋白的表达情况。结果顺铂和光动力治疗联合应用导致细胞凋亡的程度均明显强于单一顺铂作用或光动力作用,细胞中P185c-erbB-2蛋白的表达下降程度也与之相一致。但是先顺铂后光动力治疗和先光动力治疗后顺铂相比,作用效果差异不明显。结论顺铂和光动力联合治疗在体外对人宫颈癌Hela和Siha细胞有明显增殖抑制作用,强于单独一种方法治疗,其机理可能与抑制P185c-erbB-2表达有关。

Objective To investigate the mechanism of small-dose cisplatin in enhancing photodynamic therapy sensitivity and apoptosis in human cervical carcinoma cell lines.Methods The Hela and Siha cells were divided into four groups（blank control group,photodynamic therapy only,cisplatin only,photodynamic therapy and cisplatin）.The effects on proliferation of Hela and Siha cells in the four groups were examined by MTT assay.The expression of P185c-erbB-2 in Hela and Siha cells affected was detected by immunocytochemistry.Results The degree of apoptosis caused by the joint application of cisplatin and photodynamic therapy was greater than that caused by cisplatin or photodynamic therapy alone.The expression of P185c-erbB-2 in cells declined correspondingly.However,the order of cisplatin and photodynamic therapy did not cause obvious differences in the effect.Conclusion The in vitro proliferation of Hela and Siha cells is restrained obviously by cisplatin combined with photodynamic therapy;the effect is greater than that of cisplatin or photodynamic therapy only.The mechanism of cispatin＇s enhancement of photodynamic therapy sensitivity may be related to inhibiting P185c-erbB-2 expression.