Adaptation of freshwater mussels to cyanobacterial toxins: Response of the biotransformation and antioxidant enzymes

被引:45
作者
Burmester, Vanessa [2 ]
Nimptsch, Jorge [3 ]
Wiegand, Claudia [1 ]
机构
[1] Univ So Denmark, Inst Biol, DK-5230 Odense M, Denmark
[2] Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecophysiol & Aquaculture, D-12587 Berlin, Germany
[3] Univ Austral Chile, Inst Ciencias Marinas & Limnol, Valdivia, Chile
关键词
Glutathione S-transferase; Superoxide dismutase; Catalase; Microcystins; Dreissena polymorpha; Unio tumidus; GLUTATHIONE-S-TRANSFERASES; BIVALVE UNIO-TUMIDUS; DREISSENA-POLYMORPHA; MICROCYSTIN-LR; ZEBRA MUSSEL; DETOXICATION ENZYMES; OXIDATIVE STRESS; LIPID-PEROXIDATION; BIODIVERSITY; CONSERVATION;
D O I
10.1016/j.ecoenv.2011.11.037
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Freshwater mussels such as the invasive Dreissena polymorpha and the indigenous Unio tumidus nourish by high filtration rates and may accumulate cyanobacteria and their toxins during cyanobacterial blooms. Physiological adaptations to cyanotoxins enable organisms to endure cyanobacterial blooms but may differ between species. Biotransformation and excretion capacities for cyanobacteria and anthropogenic pollutants have been demonstrated for Dreissena polymorpha but less for unionid species. This study compares the activities of biotransformation (glutathione S-transferase. GST) and antioxidant enzymes (superoxide dismutase, SOD and catalase, CAT) in Dreissena polymorpha to Unio tumidus in response to cyanotoxin exposure (10 mu g L-1 and 50 mu g L-1 microcystin-LR, respectively, total microcystin from a cyanobacterial crude extract) for 24 h and 7 d exposure duration. Enzyme activities in Dreissena polymorpha were measured in the whole mussel tissue, digestive gland and in gills and in Unio tumidus in the digestive gland, gills, mantle, foot as well as in the remaining tissue. The sGST was elevated for the entire exposure period in the whole mussel tissue of Dreissena polymorpha but despite higher basal activities in digestive gland and gills of Unio tumidus, it was rather inhibited or unaltered in most of their tissues. Elevated SOD activity indicated oxidative stress response in Dreissena polymorpha, but not in Unio tumidus. The CAT activity was barely affected in both species, rather inhibited in Unio tumidus, despite again higher basal activities in digestive gland and remaining tissue. Compared to the indigenous Unio tumidus, the investigated biotransformation and oxidative stress combating enzymes respond stronger in the invasive Dreissena polymorpha. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:296 / 309
页数:14
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