组蛋白去乙酰化酶抑制剂RGFP109逆转胶质母细胞瘤U251细胞对替莫唑胺耐药性的机制研究
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篇名: 组蛋白去乙酰化酶抑制剂RGFP109逆转胶质母细胞瘤U251细胞对替莫唑胺耐药性的机制研究
TITLE:
摘要: 目的:研究组蛋白去乙酰化酶抑制剂RGFP109逆转胶质母细胞瘤U251细胞的耐药性机制。方法:建立对替莫唑胺(TMZ)耐药的TR/U251细胞,试验分为正常对照组、TMZ组(40 μmol/L)和TMZ(40 μmol/L)+RGFP109(0~120 μmol/L)不同浓度组,加入相应药物作用24 h后,CCK-8法检测细胞存活率,计算半数抑制浓度(IC50)。TUNEL法和Annexin V/PI法检测正常对照组、TMZ组和TMZ+RGFP109(42 μmol/L)组细胞的凋亡情况,免疫印迹法检测3组细胞中O6-甲基鸟嘌呤-DNA甲基转移酶 (MGMT)、存活蛋白(Survivin)、B淋巴细胞瘤2(Bcl-2)、B淋巴细胞瘤xL(Bcl-xL)蛋白表达,凝胶迁移实验检测3组细胞中p65乙酰化水平及其与κB-DNA的结合能力。结果:与正常对照组和TMZ组比较,TMZ+RGFP109不同浓度组细胞存活率明显降低(P<0.05),且呈浓度依赖性。当RGFP109浓度为42 μmol/L时,TMZ对TR/U251细胞的敏感性与U251细胞相同。与正常对照组比较,TMZ组细胞中MGMT、Survivin、Bcl-2、Bcl-xL蛋白表达均增强(P<0.01),p65乙酰化水平无明显变化,但p65与κB-DNA的结合能力增强(P<0.01)。与TMZ组比较,TMZ+RGFP109组细胞中MGMT、Survivin、Bcl-2、Bcl-xL蛋白表达均减弱(P<0.01),p65乙酰化水平增强(P<0.01),p65与κB-DNA的结合能力减弱(P<0.01)。结论:RGFP109可通过下调转录因子κB调节的抗凋亡蛋白表达,减弱p65与κB-DNA的结合来逆转 U251细胞对TMZ耐药。
ABSTRACT: OBJECTIVE: To study the mechanism of histone deacetylase inhibitor RGFP109 in reversing resistance of glioma U251 cells. METHODS: TR/U251 cells resistance to temozolomide (TMZ) was extrablished. The test was divided into normal control group, TMZ group (40 μmol/L) and TMZ (40 μmol/L)+RGFP109 (0-120 μmol/L) different concentrations groups. After 24 h of adding into related medicines, CCK-8 was used to detect the cell survival rate and calculate the half inhibitory concentration (IC50). TUNEL and Annexin V/PI were used to detect the cell apoptosis in normal control group, TMZ group and TMZ+RGFP109 (42 μmol/L) group. Immunoblotting was used to detect the O6-methyl guanine-DNA methyltransferase (MGMT), Survivin, B lymphoma 2(Bcl-2), B lymphoma xL(Bcl-xL) protein expression; and gel migration test was used to detect the p65 acetylation level and its binding capacity with κB-DNA. RESULTS: Compared with normal control group, cell survival rate in TMZ+RGFP109 different concentrations groups was obviously decreased (P<0.05), showing a concentration-dependent manner. When the RGFP109 concentration was 42 μmol/L, the sensitivity of TMZ to TR/U251 cells was the same with U251 cells. Compared with normal control group, MGMT, Survivin, Bcl-2, Bcl-xL protein expressions in cells of TMZ groups were enhanced (P<0.01); p65 acetylation level had no obvious changes, while the binding capacity of p65 and κB-DNA was strengthened (P<0.01). Compared with TMZ group, MGMT, Survivin, Bcl-2, Bcl-xL protein expressions in cells of TMZ groups were weakened (P<0.01); p65 acetylation level was enhanced (P<0.01); and the binding capacity of p65 and κB-DNA was weakened (P<0.01). CONCLUSIONS: RGFP109 can reverse the resistance of U251 cells to TMZ by down-regulating the anti-apoptotic protein expressions adjusted by transcription factor κB (NF-κB) and weakening the binding of p65 and κB-DNA.
期刊: 2017年第28卷第22期
作者: 管晨峰,李玉珍,张开礼,李宗阳,黄国栋
AUTHORS: GUAN Chenfeng,LI Yuzhen,ZHANG Kaili,LI Zongyang,HUANG Guodong
关键字: 组蛋白去乙酰化酶抑制剂RGFP109;转录因子κB;替莫唑胺;胶质母细胞瘤U251细胞;乙酰化
KEYWORDS: Histone deacetylase inhibitor RGFP109; Transcription factor κB; Temozolomide; Glioma U251 cells; Acetylation
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