Journal
AQUATIC TOXICOLOGY
Volume 150, Issue -, Pages 17-26Publisher
ELSEVIER
DOI: 10.1016/j.aquatox.2014.02.010
Keywords
Gamma radiation; Marine copepod; Oxidative stress; Growth retardation; Antioxidant mechanism; DNA repair
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Funding
- National Research Foundation [NRF-2013R1A1A2013404]
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Accidental nuclear radioisotope release into the ocean from nuclear power plants is of concern due to ecological and health risks. In this study, we used the marine copepod Paracyclopina nana to examine the effects of radioisotopes on marine organisms upon gamma radiation, and to measure the effects on growth and fecundity, which affect population and community structure. Upon gamma radiation, mortality (LD50 - 96 h = 172 Gy) in P. nana was significantly increased in a dose-dependent manner in ovigerous P. nana females. For developmental impairment of gamma-irradiated nauplii, we observed growth retardation; in over 30 Gy-irradiated groups, offspring did not grow to adults. Particularly, over 50 Gy-irradiated ovigerous P. nana females did not have normal bilateral egg sacs, and their offspring did not develop normally to adulthood. Additionally, at over 30 Gy, we found dose-dependent increases in oxidative levels with elevated antioxidant enzyme activities and DNA repair activities. These findings indicate that gamma radiation can induce oxidative stress and DNA damage with growth retardation and impaired reproduction. (C) 2014 Elsevier B.V. All rights reserved.
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