核苷酸切除修复交叉互补基因1与卵巢癌顺铂耐药的关系

目的 探讨核苷酸切除修复交叉互补基因1(ERCC1)与卵巢癌顺铂(DDP)耐药的关系.方法 分别应用免疫组化、逆转录聚合酶链反应(RT-PCR)和Western blot检测58例卵巢癌组织和ES-2、SKOV3、COC1、COC1/DDP 4株卵巢癌细胞系中ERCC1基因的表达,分析该基因与DDP化疗耐药的关系,并观察应用RNA干扰技术干扰了ERCC1基因后卵巢癌细胞对DDP敏感性的变化.结果 58例卵巢癌组织中,ERCC1表达阳性者22例,阳性率为37.9%.ERCC1的表达与DDP化疗敏感性有关(P＜0.05),DDP耐药者ERCC1表达的阳性率(57.89%)显著高于敏感者(28.21%,P=0.029).ES-2、SKOV3、COC1、COC1/DDP 4株卵巢癌细胞ERCC1基因的表达与DDP IC50正相关(r=0.932,P＜0.05).RNA干扰ERCC1基因后,ES-2、SKOV3、COC1/DDP细胞对DDP的敏感性分别增加了53.88、5.07、3.75倍.结论 ERCC1基因与卵巢癌DDP耐药有关,RNA干扰ERCC1基因可增强卵巢癌细胞对DDP的敏感性.

Relationship between nucleotide excision repair gene ERCC1 and resistance to cisplatin in ovarian cancer

OBJECTIVE: To study the relationship between nucleotide excision repair gene ERCC1 and resistance to cisplatin in ovarian cancer. METHODS: The expression of gene ERCC1 in 58 ovarian cancer tissues and 4 cell lines were examined and its relationship with resistance to cisplatin were analyzed, the changes of sensitivity to cisplatin were observed after interference of ERCC1 gene with small interfering RNA (siRNA) in ovarian cancer cell lines. RESULTS: In 58 ovarian cancer tissues, the positive rate of ERCC1 protein in chemoresistant cases (57.89%) was higher than that in chemo-sensitive cases (28.21%, P = 0.029). The mRNA levels of ERCC1 gene in ovarian cancer cell lines ES-2, SKOV3, COC1, COC1/DDP were related to cisplatin IC50 values (r = 0.932, P <0.05). The sensitivity of cell lines ES-2, SKOV3, COC1/DDP cells to cisplatin was increased by 53.88, 5.07, and 3.75 times, respectively, after RNA interfering ERCC1 gene. CONCLUSION: ERCC1 gene is associated with the resistance to cisplatin and the sensitivity to cisplatin can be enhanced by RNA interfering ERCC1 in ovarian cancer.