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S期激酶相关蛋白2(S-phase kinase-associated protein 2, SKP2)是由Zhang等[1]在1995年首次发现的,随后,Demetrick等[2]通过荧光原位杂交确定SKP2定位于人类5号染色体短臂一区三带(5p13)。SKP2蛋白属F-box蛋白家族成员,在蛋白泛素化过程中负责对底物的识别,从而促进靶蛋白通过泛素化-蛋白酶体途径降解[3]。目前已知SKP2在细胞周期、细胞凋亡和衰老等调控方面发挥重要作用,但其与肿瘤细胞辐射敏感性的关系报道较少。本研究通过正义转染和RNA干扰等方法研究了SKP2表达对食管癌细胞辐射敏感性的影响。
SKP2表达对食管癌细胞辐射敏感性的影响
Effects of SKP2 expression on radio-sensitivity of esophageal carcinoma
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摘要:
目的 探讨S期激酶相关蛋白2(SKP2)高表达和低表达对食管癌细胞辐射敏感性的影响。 方法 用Western-blotting方法筛选SKP2低表达和高表达的食管癌细胞系;构建SKP2正义表达载体p-pcDNATM 3.1/myc-His A-SKP2和RNA干扰载体SKP2 RNAi,分别转染SKP2低表达和高表达的食管癌细胞系,用5 Gy γ射线照射各组细胞,通过克隆形成实验检测细胞辐射敏感性的差异。 结果 SKP2在4种食管癌细胞中的表达水平依次为KYSE510>KYSE450>EC9706>KYSE150。用p-pcDNATM 3.1/myc-His A-SKP2表达载体转染KYSE150细胞后SKP2表达水平升高,5 Gy γ射线照射后细胞的克隆形成能力显著高于对照组(F=3.53,P<0.01),表明SKP2高表达可以降低食管癌细胞的辐射敏感性。RNA干扰载体转染KYSE510细胞后SKP2表达水平降低,5 Gy γ射线照射后细胞的克隆形成能力显著低于对照组(F=5.23,P<0.05),表明敲降SKP2表达可以增加食管癌细胞的辐射敏感性。 结论 SKP2表达与食管癌细胞的辐射敏感性密切相关,具体机制还需要进一步研究。 -
关键词:
- 食管肿瘤 /
- S期激酶相关蛋白质类 /
- RNA干扰 /
- 辐射耐受性
Abstract:Objective To explore the correlation of S-phase kinase-associated protein 2(SKP2) expression with radio-sensitivity of esophageal carcinoma. Methods Detecting the level of SKP2 in four different esophageal carcinoma cell lines using Western-blotting. Constructing p-pcDNATM 3.1/myc-His A-SKP2 expression and SKP2 RNAi vector and transfecting SKP2 low or high expression cell, respectively. Clone forming assay was used to detect the cell proliferation ability of different groups after 5 Gy γ-ray irradiation. Results The sequence of SKP2 expression level in four different esophageal carcinoma cell line was KYSE510 > KYSE450 > EC9706 > KYSE150. Compared with parent control cells, the clone forming ability of SKP2 high expression cells was significantly increased(F=3.53, P < 0.01), showing high SKP2 expression depression the radio-sensitivity of KYSE150 cell. In contrast, the clone forming ability of KYSE510 cell was significantly decreased after SKP2 knock-down(F=5.23, P < 0.05), showing low SKP2 expression promoting the radio-sensitivity of KYSE510 cell. Conclusion SKP2 expression was correlated with radio-sensitivity of esophageal carcinoma, but further study was needed to explore the molecular mechanism. -
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