Effects of heavy metal ions (Cu2+, Pb2+ and Cd2+) on DNA damage of the gills, hemocytes and hepatopancreas of marine crab, Charybdis japonica |
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Authors: | Luqing Pan Na Liu Hongxia Zhang Jing Wang Jingjing Miao |
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Institution: | Department of Aquiculture, the Key Laboratory of Mariculture, Ministry of Education,Ocean University of China, Qingdao 266003, P. R. China |
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Abstract: | There are rising concerns about the hazardous effects of heavy metals on the environment. In this study, comet assay and DNA
alkaline unwinding assay were conducted on the tissues (gills, hepatopancreas, and hemocytes) of Charybdis japonica in order to illustrate genotoxicity of three heavy metal ions (Cu2+, Pb2+, and Cd2+) on the marine crabs C. japonica. The crabs were exposed to Cu2+ (10, 50, and 100 μg.L−1), Pb2+ (50, 250, and 500 μg L−1) and Cd2+ (5, 25, and 50 μg L−1), and the tissues were sampled at days 0.5, 1, 3, 6, 9, and 15. DNA alkaline unwinding assay was used for testing the DNA
single strand break in gills and hepatopancreas and comet assay was employed for testing the DNA damage in hemocytes. The
results showed that the DNA damage (F-value) of gills in the crabs exposed to the three heavy metals was decreased gradually during the exposure periods and there
was a dose-time response relationship in certain time, suggesting that the levels of DNA single strand break in all the experimental
groups increased significantly compared to the controls. Changes of F-value in hepatopancreas of the crabs exposed to the three heavy metals were similar to those in gills except that the peak
values were found in the 500 μg L−1 Pb2+ treatment group at day 3 and the 50 μg L−1 Cd2+ treatment group at day 9. The ranks of DNA damage in gills and hepatopancreas induced by the three heavy metal ions (50 μg
L−1, day 15) were Cd2+ >Pb2+ >Cu2+ and Pb2+ >Cu2+ >Cd2+. The levels of DNA damage in gills were higher than those in hepatopancreas in the same experimental group. It can be concluded
that indices of DNA damage can be used as the potential biomarkers of heavy metal pollution in marine environment. |
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Keywords: | crabs heavy metal genotoxicity comet assay DNA alkaline unwinding assay |
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