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The sensitivity of digestive tract tumor cells to As_2O_3 is associated with the inherent cellular level of reactive oxygen species

查看全文 作　　者：Fei Gao Jing Yi Gui-Ying Shi Hui Li Xue-Geng Shi Xue-Ming Tang Department of Cell Biology,Shanghai Second Medical University,Shanghai 200025,China 高影响力作者 出　　处：《World Journal of Gastroenterology》索引2002年第8卷第1期,共4页高影响力期刊 基　　金：the grants from National Natural Science Foundation of China,No.39730270;Shanghai Science and Technology Development fund of Education Committee No.2000B101 摘　　要：AIM:To explore the correlation of the inherent cellular ROSlevel with the susceptibility of the digestive tract tumor cellsto apoptosis inducted by As_2O_3.METHODS:Two gastric cercinoma cell lines,SGC7901 andMKN45,and two esophageal carcinoma cell lines,EC/CUHKI(alternatively named EC1.71)and EC1867 with lowconcentration(2μmol·L^(-1))of As_2O_3 were cultured respectly,which confirmed the difference in apoptosis susceptibilitybetween SGC7901 and MKN45,and between EC/CUHK1 andEC1867.The cells were incubated withdihydrogenrhodamine123(DHR123),used as a ROScapture,in absence of As_2O_3.The fluorescent intensity ofrhodamine123,which was the product of cellular oxidationof DHR123,was detected by flow cytometry,and ROS wasmeasured.RESULTS:Apoptosis induced by a low concentration ofAs203 was more readily to occur in SGC7901(22.4%±2.4%)and EC/CUHK1(27.0%±2.9%)than in MKN45(2.1%±0.5%)and EC1867(0.8%±0.5%).In other words,SGC7901was more sensitive than MKN45 to As_2O_3,meanwhile EC/CUHK1 was more sensitive than EC1867 to As_2O_3.The levelof inherent cellular ROS in SGC7901(650±37)was higherthan that in MKN45(507±22)(P<0.01),and the level ofinherent cellular ROS in EC/CUHK1(462±17)was higherthan that in EC1867(187±12)(P<0.01).CONCLUSIONS.The cellular sensitivity to apoptosis inducedby As_2O_3 is associated with the difference in cellular ROSlevel.The inherent ROS level might determinate theapoptotic sensitivity of tumor cells to As_2O_3. 关 键 词：肿瘤治疗学 细胞内ROS 消化道肿瘤 细胞凋亡 AS2O3 敏感性
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