FREE-RADICAL MODES OF CYTOTOXICITY OF ADRIAMYCIN(R) AND STREPTONIGRIN

被引：41

作者：

DEGRAFF, W ^{[1
]}

HAHN, SM ^{[1
]}

MITCHELL, JB ^{[1
]}

KRISHNA, MC ^{[1
]}

机构：

[1] NCI,DIV CANC TREATMENT,CLIN ONCOL PROGRAM,RADIAT BIOL BRANCH,BETHESDA,MD 20892

来源：

BIOCHEMICAL PHARMACOLOGY | 1994年 / 48卷 / 07期

基金：

美国国家卫生研究院;

关键词：

NITROXIDES; ADRIAMYCIN; STREPTONIGRIN; EPR; SEMIQUINONE; FREE RADICALS; DNA STRAND BREAKS;

D O I：

10.1016/0006-2952(94)90567-3

中图分类号：

R9 [药学];

学科分类号：

1007 ;

摘要：

Free radical modes of cytotoxicity of streptonigrin (STN) and Adriamycin(R) (ADR) in Chinese hamster V79 cells under aerobic conditions were evaluated using 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (TP), a low molecular weight stable nitroxide free radical with antioxidant properties and desferrioxamine (DF), a transition metal chelator. In addition, exogenous superoxide dismutase (SOD, EC 1.15.1.1) and catalase (CAT, EC 1.11.1.6), were tested for cytoprotective effects. EPR studies showed that TP reacts with the semiquinones of both ADR and STN and also with O-2(-) radicals generated during aerobic redox cycling of the respective semiquinone radicals. Pulsed field gel electrophoresis studies confirmed that DNA double-strand breaks (dsb) induced by STN in V79 cells were inhibited completely by TP, whereas ADR-induced DNA dsb were not affected by TP. Clonogenic cell survival studies showed that STN-induced cytotoxicity could be inhibited completely by DF or TP. Both agents were ineffective in inhibiting ADR-induced cytotoxicity. SOD and CAT were ineffective in protecting against both STN and ADR cytotoxicity. Our results are consistent with a mechanism requiring the semiquinone radical intermediate of STN for cytotoxicity and minimal free radical involvement in ADR-induced V79 cell cytotoxicity.

引用

页码：1427 / 1435

页数：9

共 49 条

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