文章基本信息

标题：Mechanism of Resistance to Oxidative Stress in Doxorubicin Resistant Cells
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作者：Shinobu FURUSAWA ; Etsuko KIMURA ; Satoko KISARA 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2001
卷号：24
期号：5
页码：474-479
DOI：10.1248/bpb.24.474
出版社：The Pharmaceutical Society of Japan
摘要：Doxorubicin (DOX) is an anthracyclie drug widely used in chemotherapy for cancer patients, but it often gives rise to multidrug resistance in cancer cells. The purpose of this work was to study the effect of hydrogen peroxide in DOX-sensitive mouse P388/S leukemia cells and in the DOX-resistant cell line. Hydrogen peroxide induced a significant increase in dose- and time-response cell death in cultured P388/S cells. The degree of cell death in P388/DOX cells induced by hydrogen peroxide was less than that in P388/S cells treated with hydrogen peroxide. Parent cells exposed to 3 mM of hydrogen peroxide showed a loss of mitochondrial membrane potential correlated with cell death. Hydrogen peroxide at a concentration greater than 0.3 mM increased the intracellular Ca²⁺ of P388/S cells dose-dependently; however, no change following addition of hydrogen peroxide (0.3—1 mM) was observed in the resistant cells. Hydrogen peroxide (0.1 and 1 mM) treatment also induced the production of intracellular ROS in P388/S cells, while no such increase was produced by this substance in P388/DOX cells. Resistant cells also showed a significant level of glutathione (GSH) compared with the parent cells. In addition, N-acetyl-L-cysteine and reduced GSH antioxidants abolished death of P388/S cells caused by hydrogen peroxide. Therefore, it is believed that the reduced effect of oxidative stress towards the resistant cells may be related to an increase in intracellular GSH level.
关键词：hydrogen peroxide;DOX-resistant cell line;cell death;mitochondrial membrane potential;intracellular Ca2+;glutathione