膀胱移行细胞癌COX-2表达及其与肿瘤细胞增殖和凋亡的关系

目的　探讨膀胱移行细胞癌中环氧化酶 -2 (Cyclooxygenase -2 ,COX -2 )表达及其与肿瘤细胞增殖活性和凋亡程度的关系。方法　采用免疫组织化学法检测 5 4例膀胱癌、2 9例癌旁组织和 10例正常膀胱黏膜中COX -2和Ki67的表达 ,并采用TUNEL法检测原位细胞凋亡水平 ,结合临床病理资料分析。结果　膀胱癌组织中COX -2阳性表达、Ki67标记指数及细胞凋亡指数均显著高于癌旁组织及正常膀胱黏膜 (P <0 0 1) ;COX -2表达水平和Ki67标记指数均与膀胱癌分化、临床分期、淋巴转移呈正相关 ;细胞凋亡指数与肿瘤分期、分级呈负相关 ,即肿瘤“瘤级”和“瘤期”越高 ,则细胞凋亡越少 ,易复发肿瘤其细胞凋亡指数明显低于无复发肿瘤 ;COX -2表达水平的升高伴随着肿瘤细胞增殖活性的增加和凋亡程度的降低。结论　膀胱移行细胞癌中COX -2表达上调 ,其表达水平与肿瘤细胞的分化、生长及转移相关 ;COX -2的高表达可能通过促进细胞增殖和 /或诱导细胞发生凋亡耐受在膀胱癌的发生、发展中发挥重要作用

Expression of COX-2 in Bladder Transitional Cell Carcinoma and its Association with Tumor Cell Proliferation and Apoptosis

Objective To investigate the expression level of cyclooxygenase-2 (COX-2) and its effects on cell proliferation and apoptosis in bladder cancer. Methods The immunohistochemical method was used to determine the expression of COX-2 and Ki67 in 54 cases of bladder cancer, 29 cases of adjacent tumor tissue and 10 cases of normal bladder specimen respectively, and the apoptotic levels of the obove three tissues were assessed by counting the number of the cells labeled by TUNEL method. Results The positive rate of COX-2, the mean labelling index of Ki67 and the cellular apoptosis index in the cancer tissues were significantly higher than those in adjacent tumor tissues and normal bladder specimens(P<0 01). The staining intensity of COX-2 and labelling index of Ki67 were positive correlation with the pathological grade, clinical stage and the lymph node metastasis of bladder cancer. The cellular apoptosis index was negative relation with grade and stage of the tumor. The expression level of Ki67 increased with the COX-2 expression increasing, and apoptosis degree decreasing. Conclusion COX-2 overexpression was found in bladder cancer. The expression level of COX-2 was related to the pathological grade, clinical stage and the lymph node metastasis of bladder cancer. COX-2 overexpression may play an important role in the pathogenesis of bladder cancer by promoting cell proliferation and suppressing cell apoptosis.