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作 者:赵作辉[1,2] 李翠玲[2] 王道光[2] 王风芹[2] 曲宏懿[1] 丁森泰[3] 巩晶[2] 吕家驹[3] 杨静华[2]
机构地区:[1]山东大学附属千佛山医院小儿外科,山东济南250014 [2]山东大学齐鲁医学部基础医学院癌症研究中心,山东济南250012 [3]山东大学附属省立医院泌尿外科,山东济南250021
出 处:《山东大学学报(医学版)》2017年第9期31-35,共5页Journal of Shandong University:Health Sciences
基 金:山东省科技重大专项(2015ZDXX0802A02);山东省医药卫生科技发展计划(2016WS0481)
摘 要:目的探讨沉默信息调节因子2-相关酶3(SIRT 3)对肾透明细胞癌细胞系786-O中锰型超氧化物歧化酶(MnSOD)的去乙酰化作用及其对786-O细胞增殖、凋亡的影响。方法Western blotting和免疫共沉淀(IP)测定786-O中MnSOD乙酰化的水平;MnSOD酶活性试剂盒、四甲基偶氮唑盐(MTT)和Hoechst荧光染色分别检测肾癌细胞中MnSOD酶活性、细胞增殖和凋亡。结果与空白载体(pcDNA3.0)相比,SIRT 3(转染pcDNA3.0-sirt3)使MnSOD乙酰化水平由1.29±0.16降低为0.74±0.07(t=7.21,P<0.001),其酶活性由(1.47±0.17)U/mg增加至(2.53±0.31)U/mg(t=6.70,P<0.001)、细胞增殖率由(25.28±5.75)%增加至(48.86±7.47)%(t=5.60,P<0.001),而细胞凋亡率由(4.53±0.51)%变为(4.45±0.59)%,差异无统计学意义(t=0.24,P=0.82)。结论肾透明细胞癌786-O中MnSOD的去乙酰化增强其细胞增殖能力,MnSOD或其乙酰化可能是肾透明细胞癌治疗的一个潜在靶点。Objective To investigate the deacetylation of manganese superoxide dismutase(MnSOD) regulated by silent information regulator 2-related enzymes(SIRT 3) in 786-O,a clear cell renal cell carcinoma(ccRCC) cell line,and its subsequent influences on cell proliferation and apoptosis viability.Methods Western blotting and immunoprecipitation(IP) were employed to confirm MnSOD acetylation in 786-O cells.Superoxide dismutase(SOD) activity kit,3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) assay and Hoechst fluorescence staining solution were used to measure MnSOD enzymatic activity,cell proliferation and apoptosis viability,respectively.Results Compared with plasmid empty vector(pcDNA3.0),SIRT 3(pcDNA3.0-sirt3) deacetylated mitonchondrial MnSOD from 1.29±0.16 to 0.74±0.07 in 786-O cells(t=7.21,P〈0.001),enhanced its enzymatic activity from(1.47±0.17) U/mg to(2.53±0.31) U/mg(t=6.70,P〈0.001),increased cell proliferation rate from(25.28±5.75) % to(48.86±7.47) %(t=5.60,P〈0.001),whereas cell apoptosis rate changed from(4.53±0.51) % to(4.45±0.59) %,which remained stable(t=0.24,P=0.82).Conclusion MnSOD deacetylation enhances the proliferation activity of ccRCC cell line 786-O,which indicates that MnSOD or its acetylation might be a potential therapeutic target for RCC.
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