Quercetin Protects Spermatogonial Cells from 2,4-D-Induced Oxidative Damage in Embryonic Chickens

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  • MI Yuling
    College of Animal Sciences, Zhejiang University
  • ZHANG Caiqiao
    College of Animal Sciences, Zhejiang University
  • TAYA Kazuyoshi
    Division of Animal Life Science, Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology

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Quercetin, an antioxidant flavonoid, is considered beneficial to human and animal health. In this study, the protective effects of quercetin in relation to oxidative damage of testicular cells were studied by analysis of the intracellular antioxidant system after treatment of embryonic chickens with hypoxanthine-xanthine oxidase (HX-XO) or 2,4-dichlorophenoxyacetic acid (2,4-D). Testicular cells from Day 18 embryos were challenged with quercetin alone or in combinations with HX-XO or 2,4-D for 48 h in culture. The results showed that quercetin manifested no deleterious effects on spermatogonial cells at concentrations up to 1.0 μg/ml. Exposure to HX-XO or 2,4-D (50 μg/ml) induced condensed nuclei and vacuolated cytoplasm and a decrease in testicular cell viability and spermatogonial cell number. Membrane integrity was damaged by elevated lactate dehydrogenase leakage. Exposure to HX-XO or 2,4-D also elicited lipid peroxidation by elevation of thiobarbituric acid reactive substances and decreased glutathione content and superoxide dismutase activity. However, simultaneous supplementation with quercetin restored these parameters to the levels in the controls. Consequently, HX-XO and 2,4-D induced oxidative stress in spermatogonial cells; however, dietary quercetin may attenuate the negative effects of environmental toxicants and restore the antioxidant system in testicular cells.<br>

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