Effects of water-borne copper on the gills and hepatopancreas of Macrobrachium rosenbergii

文献类型： 外文期刊

第一作者： Li, Na

作者： Li, Na;Ma, Qiang;Zhao, Yunlong;Yang, Jian;Li, Na;Brochon, Jean-Claude

作者机构：

关键词： copper;gills;hepatopancreas;isozymes;Macrobrachium rosenbergii;polyacrylamide electrophoresis

期刊名称：INTEGRATIVE ZOOLOGY （ 影响因子：2.654； 五年影响因子：2.525 ）

ISSN： 1749-4877

年卷期： 2008 年 3 卷 4 期

页码：

收录情况： SCI

摘要： We focused on elucidating the toxic effects of water-borne copper on the giant freshwater prawn Macrobrachium rosenbergii. After seven days of exposure to copper (Cu2+) at concentrations ranging from 0.01 mg L-1 to 0.5 mg L-1, three isozymes, malate dehydrogenase, alkaline phosphatase and esterase, were analyzed and compared using polyacrylamide electrophoresis (PAGE) and biochemical staining. The results indicated that the electrophoretic patterns of the isozymes showed a copper-concentration-related difference. Low doses of copper stimulated strong expression of the three isozymes. Electrophoretic patterns of malate dehydrogenase and alkaline phosphatase gradually became weaker or even lost as the level of copper increased. In contrast, esterase patterns exhibited an increased molecular heterogeneity at higher copper concentrations. A transmission electron microscope was used to study ultrastructure differences in the gills and hepatopancreas of M. rosenbergii, and the results showed significant structural damage at increased levels of copper compared with the control group. The basement membranes and mitochondira in the gills were seriously damaged, the cuticle electron density distribution was not homogeneous, and an infolded basement membrane, circularized nucleus, disintegrated nuclear membrane, and decreased mitochondria number and size were observed in the gills. Similarly, flowing out of karyoplasms, partly falling microvilli, decreased mitochondrion, partly disappeared mitochondrial cristae, and a thinned matrix were observed in the hepatopancreas. These findings indicate that exposure to elevated copper levels might damage the ultrastructure of the gills and hepatopancreas of M. rosenbergii and might further weaken their normal physical activities. Isozymes were quite sensitive to environmental stress and changes in isozyme elctrophoretic patterns might be effective biomarkers of environmental contamination.

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