The toxic effects of abamectin (ABM), an anthelmintic drug, on the snail, Physa Acuta, and the biochemical
responses to the exposure stress were evaluated. The activities of superoxide dismutase (SOD), catalase
(CAT), glutathione S-transferase (GST), acetylcholinesterase (AChE), and nitric oxide synthase (NOS), and
the contents of malondialdehyde (MDA) were determined in snail soft tissues (head, foot, visceral mass,
and the mantle) for up to 96 h of exposure to 3.4, 9.6, 19.2, or 27.4 μg L1 of ABM. The results showed that
SOD and GST activities were promoted by ABM-exposure at the earlier periods of treatment (12–48 h)
while these activites were inhibited at the end of test. The tendency of CAT activity was similar to that of
SOD, but it increased at the end of test. MDA levels of the snail soft tissues increased in all treatment
groups, including the recovery group, indicating that lipid peroxidation occurred in snail soft tissues. ABMexposure
inhibited AChE activity. However, NOS activities increased by ABM-exposure. In addition,
activities of antioxidant enzymes and AChE from the snail soft tissues resumed the normal levels after
96 h of recovery period, but MDA level did not attain the original level. This study provides information on
the biochemical mechanism of ABM toxicity on the snail.
The toxic effects of abamectin (ABM), an anthelmintic drug, on the snail, Physa Acuta, and the biochemicalresponses to the exposure stress were evaluated. The activities of superoxide dismutase (SOD), catalase(CAT), glutathione S-transferase (GST), acetylcholinesterase (AChE), and nitric oxide synthase (NOS), andthe contents of malondialdehyde (MDA) were determined in snail soft tissues (head, foot, visceral mass,and the mantle) for up to 96 h of exposure to 3.4, 9.6, 19.2, or 27.4 μg L1 of ABM. The results showed thatSOD and GST activities were promoted by ABM-exposure at the earlier periods of treatment (12–48 h)while these activites were inhibited at the end of test. The tendency of CAT activity was similar to that ofSOD, but it increased at the end of test. MDA levels of the snail soft tissues increased in all treatmentgroups, including the recovery group, indicating that lipid peroxidation occurred in snail soft tissues. ABMexposureinhibited AChE activity. However, NOS activities increased by ABM-exposure. In addition,activities of antioxidant enzymes and AChE from the snail soft tissues resumed the normal levels after96 h of recovery period, but MDA level did not attain the original level. This study provides information onthe biochemical mechanism of ABM toxicity on the snail.
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