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H_2O_2诱导SD大鼠视网膜细胞凋亡过程中细胞内钙离子浓度的变化
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Journal Article
H_2O_2诱导SD大鼠视网膜细胞凋亡过程中细胞内钙离子浓度的变化
2015
Overview
目的观察H2O2诱导原代培养SD大鼠视网膜细胞凋亡过程中细胞内Ca2＋浓度（[Ca2＋]i）的变化及其来源。方法取1-3d内新生SD大鼠视网膜进行原代细胞培养,以100μmol/L H2O2作用0、2、4、8、12、24h,采用MTT法进行细胞活力检测,应用Hoechst 33342染色法进行细胞凋亡检测,以Fluo-3AM为细胞内Ca2＋探针并利用荧光激活细胞分类技术（FACS）进行[Ca2＋]i检测,确定H2O2诱导细胞损伤及凋亡过程中[Ca2＋]i的变化;应用细胞外Ca2＋螯合剂EGTA初步检测H2O2诱导的[Ca2＋]i变化是否源于细胞外Ca2＋内流。结果 100μmol/L H2O2可诱导原代培养的SD大鼠视网膜细胞发生凋亡,且凋亡数目呈时间依赖性递增;100μmol/L H2O2作用2-24h均可显著降低细胞活力,而[Ca2＋]i的升高出现在H2O2作用2h且维持至12h,然后逐渐下降,至24h恢复至正常水平;0.5-5mmol/L EGTA可显著削弱由100μmol/L H2O2作用2h导致的[Ca2＋]i增加。结论在H2O2诱导原代培养的SD大鼠视网膜细胞发生凋亡过程中,[Ca2＋]i的升高发生在凋亡的早期阶段,而非细胞凋亡全过程中;H2O2的损伤作用所导致的[Ca2＋]i升高部分来源于细胞外Ca2＋的内流。
