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组蛋白修饰改变在亚砷酸钠毒性效应中的作用研究

Keywords: 亚砷酸钠,dna损伤,h3k4甲基化,lsd1

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Abstract:

?目的:探讨组蛋白h3修饰在亚砷酸钠暴露引起的毒性效应中的作用及其调控机制。方法:在hbe细胞中构建组蛋白h3赖氨酸修饰位点突变的细胞株,用亚砷酸钠作用于细胞,四甲基噻唑蓝(mtt)法检测其细胞毒性;用微核实验检测组蛋白h3k4突变后对亚砷酸钠诱导dna损伤的影响;用蛋白印迹检测亚砷酸钠对h3k4甲基化蛋白表达的影响并用qrt-pcr筛查了其上游修饰酶mrna水平的表达。结果:组蛋白修饰缺陷细胞株中,h3k4修饰缺陷后的hbe细胞在1μmol/l亚砷酸钠染毒作用下细胞活力降低60%左右(p<0.01),且可致hbe细胞双核微核率升高2倍以上(p<0.01);1μmol/l亚砷酸钠处理hbe细胞可引起h3k4me2/3蛋白水平升高(p<0.05),同时赖氨酸特异性去甲基化修饰酶1(lsd1)的表达下降(p<0.01)。结论:亚砷酸钠染毒诱导细胞组蛋白修饰发生改变,其中h3k4甲基化修饰水平上调,可能参与砷引发的细胞毒性和遗传毒性过程,其修饰改变可能受到lsd1的调控。

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