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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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Alpha-linolenic acid (ALA) is one of n-3 polyunsaturated fatty acids and found mainly in the chloroplasts. Many studies have been reported that intracellular reactive oxygen species (ROS) in mammalian oocytes were reduced by supplementation of ALA in in vitro maturation (IVM) medium. Based on these reports, we expected that ALA acts as an antioxidant during IVM of porcine oocytes. Therefore, the objective of this study was to investigate the antioxidant effect of ALA supplementation during IVM in porcine oocytes. The cumulus-oocyte complexes (COCs) were incubated in IVM medium containing $200{\mu}m$ $H_2O_2$ or $H_2O_2$ with $50{\mu}m$ ALA for 44 h. Nuclear maturation stage of oocytes was evaluated using aceto-orcein method. For measurement of oxidative stress state, intracellular ROS and glutathione (GSH) levels were measured using carboxy-DCFDA and cell tracker red, respectively. In results, oocytes in metaphase-II (MII) stage development was significantly reduced in $H_2O_2$ group compared to non-treated control group $61.84{\pm}1.42%$ and 80.00%, respectively; p<0.05) and it was slightly recovered by treatment of ALA ($69.76{\pm}1.67%$; p<0.05). The intracellular GSH levels was decreased in $H_2O_2$ groups compared with control groups, but it was enhanced by ALA treatment (p<0.05). On the contrary, $H_2O_2$ treatment increased intracellular ROS level in oocytes and $H_2O_2$-induced ROS was decreased by treatment of ALA (p<0.05). Our findings suggested that ALA treatment under oxidative stress condition improve oocyte maturation via elevated GSH and reduced ROS levels in oocytes. Therefore, these results suggest that ALA have an antioxidative ability and it could be used as antioxidant in in vitro production system of porcine embryo.
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