STOML2基因对口腔鳞状细胞癌细胞致瘤能力的影响及相关机制

The effects of STOML2 gene on tumorigenicity of oral squamous cell carcinoma cells and related mechanisms

目的:探索人口型蛋白样蛋白2(STOML2)在口腔鳞状细胞癌(OSCC)组织中的表达及其对口腔鳞状细胞癌细胞(OSCCCs)体外和体内致瘤能力的影响和相关机制。方法:Western blot检测STOML2蛋白在56例OSCC患者组织及癌旁组织中的表达。将OSCCCs SCC-15分为2组,实验组转染STOML2-siRNA质粒,对照组转染MOCK-siRNA质粒,荧光定量PCR检测各组细胞STOML2 mRNA含量,Western blot检测2组细胞的STOML2、CDK4、P16的表达,流式细胞仪检测细胞周期,CCK8检测细胞的增殖能力;利用裸鼠皮下种植瘤模型检测实验组和对照组细胞的体内致瘤能力。结果:OSCC患者癌和癌旁组织STOML2阳性率分别为92.86%(52/56)和8.93%(5/56)(P<0.001)。在siRNA处理后的实验组和对照组SCC-15细胞中STOML2 mRNA表达量分别为(0.43±0.09)和(1.23±0.19),STOML2蛋白表达量分别为(0.52±0.11)和(0.94±0.17)(P<0.05),CDK4表达量分别为(0.33±0.13)和(1.18±0.17)(P<0.05),P16表达量分别为(0.93±0.12)和(0.29±0.03);CCK8实验120 h实验组和对照组SCC-15细胞的吸光度分别为(1.11±0.24)和(2.19±0.28)(P<0.05),G2/M期细胞分别为35.72%±5.33%和18.65%±3.71%(P<0.05),裸鼠皮下移植瘤瘤块的体积分别为(1192.07±250.9)μm3和(2280.5±600.1)μm3,质量分别为(0.65±0.30)g和(1.62±0.40)g,但小鼠体重整体变化没有明显差异。结论:STOML2在OSCC中表达升高,STOML2通过调控P16相关通路的影响OSCCCs的致瘤能力。

Objective:To study the expression of stomatin-like protein 2(STOML2)in oral squamous cell carcinoma(OSCC)tissue and the effects of STOML2 on the tumorigenicity of OSCC cells(OSCCCs)in vitro and in vivo,and the related mechanism.Methods:The protein expression of STOML2 in OSCC and adjacent tissues of 56 patients was detected.OSCCCs SCC-15 were divided into 2 groups.Stoml2-siRNA plasmid was transfected into the cells of experimental group and Mock-siRNA plasmid was transfected into the cells of control group.The mRNA and protein expression of STOML2,CDK4 and P16 in the cells was detected by qPCR and Western blot respectively.The cell cycle of the cells was detected by flow cytometry,and the proliferation of the cells was detected by CCK8 asay.The tumorigenicity of the cells was detected by subcutaneous tumor model in nude mice.Results:The positive rate of STOML2 in OSCC and adjacent tissues was 92.86%(52/56)and 8.93%(5/56)respectively(P<0.001).After siRNA transfection,STOML2 mRNA expression in SCC-15 cells of experimental group and control group was(0.43±0.09)and(1.23±0.19),STOML2 protein expression was(0.52±0.11)and(0.94±0.17)respectively.CDK4 expression was(0.33±0.13)and(1.18±0.17),P16 expression was(0.93±0.12)and(0.29±0.03),respectively.In CCK8 assay the absorbance of SCC-15 cells in experimental group and control group was(1.11±0.24)and(2.19±0.28),in flow cytometry the percentage of cells in G2/M phase was 35.72%±5.33%and 18.65%±3.71%(P<0.05),respectively.In vivo test showed that the volume(μm3)of subcutaneous transplanted tumor was 1192.07±250.9 and 2280.5±600.1,the weight(g)of mice was 0.65±0.30 and 1.62±0.40,respectively.Conclusion:STOML2 expression increases in OSCC,STOML2 affects the tumorigenic ability of OSCCCs in vitro and in vivo by regulating P16 related pathways.