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[摘要]
目的:分析环氧合酶2(cyclooxygenase-2,COX-2)的表达与肝癌患者临床病理特征及预后的关系,探讨刺芒柄花素 (formononetin,FOR)在肝癌发生和发展中的作用及其机制。方法:收集2021年1~5月河北医科大学第四医院20例手术治疗肝 癌患者的癌和相应的癌旁组织、60例手术治疗肝癌患者的临床资料,以及人肝癌细胞系HepG2和Bel-7402。用qPCR法和免疫组 织化学染色法检测肝癌组织中COX-2的表达,分析其表达与患者临床病理特征和预后的关系。构建小鼠二乙基亚硝胺诱导 肝癌模型,验证FOR对肝癌发病的影响。用0.003、0.006 μmol/ml的FOR分别处理肝癌细胞HepG2和Bel-7402 48 h后,用CCK-8 法和流式细胞术检测FOR对肝癌细胞增殖和周期的影响,qPCR和WB法检测细胞中COX-2、CDK4、CDK6和cyclin D1表达的变 化。结果:肝癌组织中COX-2 mRNA表达水平显著高于癌旁组织(P<0.01),COX-2 蛋白表达阳性率为68.3%(41/60);COX-2 表达阳性与患者 TNM 分期晚、肿瘤大、生存期短有关(均P<0.05)。诱导小鼠肝癌模型中,FOR处理组小鼠肝癌的发生率显著 降低、肝癌组织中COX-2表达显著降低(均P<0.05)。FOR处理可显著抑制HepG2和Bel-7402细胞的增殖能力,增加G0/G1期细 胞比例、降低S和G2期细胞比例(均P<0.05),抑制细胞中COX-2和cyclin D1的表达(均P<0.01)。。结论:COX-2表达阳性肝癌患 者临床分期较晚且预后较差,FOR可通过抑制COX-2和cyclin D1表达来降低肝癌的发生和发展。
[Key word]
[Abstract]
Objective: To analyze the relationship between the expression of cyclooxygenase-2 (COX-2) and clinicopathological features and prognosis of patients with liver cancer, and to explore the role and mechanism of formononetin (FOR) in the pathogenesis of liver cancer. Methods: The clinical data of 60 patients with liver cancer and 20 pairs of surgically resected cancer tissues and corresponding para-cancerous tissues from liver cancer patients that treated in the Fourth Hospital of Hebei Medical University during January 2021 and May 2021 were collected for this study; in addition, human liver cancer cell lines HepG2 and Bel-7402 were also collected. The expression of COX-2 in liver cancer tissues was detected by qPCR and immunohistochemical staining, and the relationship between COX-2 expression and clinicopathological characteristics and prognosis of patients was analyzed. Diethylnitrosamine-induced mouse model of liver cancer was established to verify the effect of FOR on the incidence of liver cancer. After being treated with 0.003 and 0.006 μmol/ml FOR 48 h, the effects of FOR on proliferation and cell cycle of HepG2 and Bel-7402 cells were detected by CCK-8 and Flow cytometry. The changes in the expression of COX-2, CDK4, CDK6 and cyclin D1 were detected by qPCR and WB. Results: The mRNA expression of COX-2 in liver cancer tissues was significantly higher than that in para cancerous tissues ( P<0.01 ). The positive expression rate of COX-2 in liver cancer tissues was 68.3% (41/60), and the positive expression of COX-2 was correlated with advanced TNM stage, large tumor and short survival (all P<0.05 ). In the xenograft mouse model of induced liver cancer, the incidence of liver cancer in mice treated with FOR was significantly reduced, and the expression of COX-2 in liver tissues was significantly decreased (all P<0.05 ). FOR significantly inhibited the proliferation, increased the proportion of cells at G0/G1 phase, decreased the proportion of cells at S and G2 phase (all P<0.05 ), and inhibited the expression of COX-2 and cyclin D1 in HepG2 and Bel-7402 cells (all P<0.01 ). Conclusion: Liver cancer patients with positive COX-2 expression have an advanced clinical stage and a poor prognosis. FOR can prevent the occurrence and development of liver cancer by inhibiting the expression of COX-2 and cyclin D1.
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[基金项目]
河北省卫生厅科研基金资助项目(No. 20200110)