Effects of water-borne copper on metallothionein and lipid peroxidation in the marine amphipod Gammarus locusta |
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| Authors: | Correi Ana D Livingstone David R Costa M Helena |
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| Institution: | IMAR-Institute of Marine Research, Department of Environmental Sciences and Engineering, College of Sciences and Technology, Lisbon New University, Caparica, Portugal. adc@mail.fct.unl.pt |
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| Abstract: | The aim of the current work was to determine over 10 days the effects of water-borne exposure of the marine amphipod Gammarus locusta to 4 microgCu l(-1) on the metallothionein (MT; measured by differential pulse polarography) protection system and lipid peroxidation (LP: thiobarbituric acid-reactive malondialdehyde equivalents) as a measure of oxidative damage. MT levels in exposed animals increased significantly at day 2 (36% > control; P < 0.001) and remained high at days 6 and 10 (55 and 38%, respectively, P < 0.001). The maximum level of MT at day 6 coincided with the highest Cu body-burden. LP increased within I day of exposure, indicative of Cu as an oxidative stressor. However, in contrast to MT, the highest LP level was seen at day 4 (68% > control, P < 0.001) before returning to control values by day 6, indicating a protective role of MT against the pro-oxidant effects of Cu. |
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