STMN1在宫颈癌中表达的临床意义及抑制其表达对宫颈鳞癌SiHa细胞活力和凋亡的影响

目的:探讨微管解聚蛋白1(STMN1)在宫颈癌中表达的临床意义及抑制其表达对宫颈癌细胞增殖和凋亡的影响。方法:Western blot法检测宫颈癌组织中STMN1的蛋白表达,并分析其表达与宫颈癌临床指标的关系;将靶向STMN1基因的小干扰RNA(siRNA)转染宫颈鳞癌Si Ha细胞,转染48 h后通过Western blot法检测各组细胞中STMN1及信号转导与转录激活因子3(STAT3)信号通路中STAT3、p-STAT3和survivin的蛋白水平;MTT法检测细胞活力;流式细胞术检测细胞凋亡;2’,7’-二氯二氢荧光素二乙酸酯(DCFH-DA)探针检测细胞活性氧簇(ROS)的水平。结果:STMN1在宫颈癌组织中表达显著高于癌旁组织(P0.01),其表达水平与宫颈癌患者年龄和组织学分型无关,而与临床分期、组织学分化程度及淋巴结转移相关(P0.01);STMN1-siRNA转染可显著降低宫颈鳞癌Si Ha细胞中STMN1的表达;与未经处理细胞比较,STMN1-siRNA转染的细胞活力显著降低,凋亡率增加,ROS含量升高,p-ATAT3和survivin蛋白水平均下调(P0.01),STAT3的蛋白水平与未经处理细胞的差异无统计学显著性。结论:STMN1在宫颈癌中高表达,其表达与临床分期、组织学分化程度及淋巴结转移相关,抑制其表达可通过下调STAT3信号通路降低肿瘤细胞的活力及诱导凋亡。

Clinical significance of STMN1 expression in cervical cancer and effect of inhibition of its expression on viability and apoptosis of cervical cancer SiHa cells

AIM: To investigate the clinical significance of stathmin 1 (STMN1) expression in cervical cancer and the influence of its expression on the viability and apoptosis of cervical cancer cells. METHODS: Western blot was used to detect the protein expression of STMN1 in cervical cancer tissues, and the relationship between the expression and clinical characteristics of cervical cancer was analyzed. STMN1-siRNA was transfected into cervical squamous-cell carcinoma SiHa cells. The protein levels of STMN1, STAT3, p-STAT3 and survivin were determined by Western blot after transfection for 48 h. The cell viability was measured by MTT assay. The apoptosis was analyzed by flow cytometry. DCFH-DA probe was used to detect the level of reactive oxygen species (ROS). RESULTS: The protein expression of STMN1 in cervical cancer tissues was significantly higher than that in paracancerous tissues (P<0.01). The STMN1 protein expression level was not correlated with age and histological types of cervical cancer patients, but was related to clinical stage, histological differentiation and lymph node metastasis (P<0.01). Transfection with STMN1-siRNA significantly reduced the expression of STMN1 in SiHa cells. Compared with control group, the cell viability in STMN1-siRNA group was significantly decreased, the apoptotic rate and ROS content were increased, and the protein levels of p-STAT3 and survivin were down-regulated (P<0.01). However, no significant difference of the STAT3 protein level was observed between STMN1-siRNA group and control group. CONCLUSION: STMN1 is highly expressed in cervical cancer, and its expression is related to clinical stage, histological differentiation and lymph node metastasis. Inhibition of STMN1 expression reduces the viability and promotes apoptosis of cancer cells by down-regulating STAT3 signaling pathway.