环氧合酶-2和诱导型一氧化氮合酶在宫颈癌组织中的表达及其意义

Expression of cyclooxygenase-2 and inducible nitric oxide synthase in cervical carcinomas and its significance

目的 :探讨环氧合酶 2 (COX 2 )与诱导型一氧化氮合酶 (iNOS)的表达与人宫颈癌发生发展的关系。方法 :应用免疫组织化学方法及逆转录聚合酶链反应 (RT PCR)技术检测 2 5例宫颈癌组织中COX 2和iNOS蛋白及mRNA的表达。结果 :宫颈癌组织中COX 2、iNOSmRNA的表达与正常组织比较均明显上调 ;其蛋白阳性表达率分别为 6 0 %和 80 % ;COX 2蛋白的阳性表达与组织学分级呈负相关 (r=- 0 4 2 0 ,P <0 0 5 )。淋巴结转移阳性组COX 2的表达高于阴性组 ,差异具有显著性 (P <0 0 5 )。iNOS蛋白的阳性表达与宫颈癌的临床分期及肿瘤分化程度有关 ,COX 2与iNOS蛋白阳性表达呈正相关 (r =0 4 5 6 ,P <0 0 1)。结论 :COX 2及iNOS的共同高表达可能参与宫颈癌的侵袭和转移 ,选择性COX 2抑制剂联合iNOS抑制剂的协同作用可能有助于晚期宫颈癌的治疗。

Purpose:To investigate the relation of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) to tumor progression of cervical carcinoma. Methods:The expression and localization of COX-2 and iNOS protein in the 25 patients with cervical carcinomas were determined by immunohistochemical and the gene expression of COX-2 and iNOS were examined by reverse-transcription polymerase chain reaction ( RT-PCR). Results:Immunohistochemical staining for COX-2 and iNOS expression was strongly positive in 15 of 25 (60 %) and 20 of 25 (80 %) cases,respectively. Increased COX-2 and iNOS mRNA levels were confirmed by RT-PCR. There was negative correlation between COX-2 expression and tumor cell differentiation(r=-0.420, P <0.05 ). The expression rate of COX-2 in lymphatic metastasis was significantly higher than that in non-metastasis ( P <0.05 ). The expression of iNOS had association with clinical stages and histological grades of cervical carcinoma,( P <0.05,respectively). Conclusions:Combined expression of COX-2 and iNOS may play an important role in biological behavior of cervical carcinomas,and contribute to promote cervical carcinoma growth invasion. Selective inhibitors of COX-2 and iNOS might be useful for the treatment of cervical carcinomas.