Activity of the enzymes of the antioxidative system in cadmium-treated Oxya chinensis (Orthoptera Acridoidae)

文献类型： 外文期刊

第一作者： Li, LJ

作者： Li, LJ;Liu, XM;Guo, YP;Ma, EB

作者机构：

关键词： cadmium (Cd);oxidative stress;superoxide dismutase (SOD);catalase (CAT);guaiacol peroxidase (GPx);insect;oxya chinensis

期刊名称：ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY （ 影响因子：4.86； 五年影响因子：4.462 ）

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收录情况： SCI

摘要： One purpose in this research was to determine the toxic effects of Cd on antioxidant enzymes of Oxya chinensis (Orthoptera: Acridoidae). Changes in the activities of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and guaiacol peroxidase (GPx) were measured in O. chinensis insects injected with Cd~(2+). Fifth-nymphs of O. chinensis insects were injected with Cd~(2+) at different concentrations (0, 0.55 x 10~(-4), 1.10 x 10~(-4), 1.65 x 10~(-4), 2.20 x 10~(-4), and 2.75 x 10~(-4)gg~(-1)). An increase in SOD activity in O. chinensis was observed at 1.10 x 10~(-4) to 2.75 x 10~(-4)gg~(-1) Cd~(2+). The SOD activity was lower at 2.20 x 10~(-4) and 2.75 x 10~(-4)gg~(-1) than that at 1.10 x 10~(-4) and 1.65 x 10~(-4) g g~(-1). It appears that SOD had a positive protective effect at low Cd~(2+) concentrations, and that this effect disappeared at high Cd~(2+) concentrations. CAT activity was accelerated to vary ing degrees at 1.10 x 10~(-4) to 2.75 x 10~(-4)gg~(-1) for males and at 1.10 x 10~(-4),2.20x 10~(-4), and 2.75 x 10~(-4)g g~(-1) for females. CAT showed a strong detoxification effect with all treatments. GPx activity decreased with increasing Cd~(2+) concentration with all treatments for males and at 2.20 x 10~(-4) and 2.65 x 10~(-4)gg~(-1) for females. We showed that GPx activity had a weak detoxification function with all treatments for males and at high Cd~(2+) for females. Thus, CAT had a strong detoxification effect, whereas SOD had a medium and GPx had a weak detoxification effect. Among the three enzymes, CAT played an important role in the damaging mechanisms of reactive oxygen species in O. chinensis insects. Alterations of the antioxidant enzyme level under environmental stresses are suggested as indicators of biotic and abiotic stress.

分类号： R9

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