한국수정란이식학회지 (Journal of Embryo Transfer)

  • 제32권4호
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  • Pages.287-295
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  • 2017
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  • 2508-755X(pISSN)
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  • 2288-0178(eISSN)
한국수정란이식학회 (The Korean Society of Embryo Transfer)
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Endoplasmic Stress Inhibition during Oocyte Maturation Improves Preimplantation Development of Cloned Pig Embryos

  • Elahi, Fazle (College of Veterinary Medicine, Kangwon National University) ;
  • Shin, Hyeji (College of Veterinary Medicine, Kangwon National University) ;
  • Lee, Joohyeong (Institute of Veterinary Science, Kangwon National University) ;
  • Lee, Eunsong (College of Veterinary Medicine, Kangwon National University)
  • 투고 : 2017.12.04
  • 심사 : 2017.12.22
  • 발행 : 2017.12.30
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초록

Mitochondrial dysfunction is found in oocytes and transmitted to offspring due to maternal obesity. Treatment of obese mothers with endoplasmic reticulum (ER) stress inhibitors such as salubrinal (SAL) can reverse the mitochondrial dysfunction and result in normal embryonic development. Pig oocytes have also shown ER stress mostly in metaphase II stage. ER stress in oocytes may hinder the in vitro production of pig embryos. This study investigated the effect of ER stress inhibition by SAL treatment during in vitro maturation (IVM) of porcine oocytes at 1, 10, 50 and 100 nM concentrations. Firstly, we tested various concentrations of SAL. SAL at 10 nM showed higher (P < 0.05) developmental competence to the blastocyst stage (55.6%) after parthenogenesis (PA) than control (44.2%) while not different from other concentrations (49.2, 51.6, and 50.8% for 1, 50, and 100 nM, respectively). Secondly, we performed time-dependent treatment at 10 nM of SAL for IVM of oocytes. It revealed that treatment with SAL during 22 to 44 h of IVM significantly improved PA embryonic development to the blastocyst stage compared to control (40.5, 46.3, 51.7 and 60.2% for control, 0 to 22 h, 22 to 44 h and 0 to 44 h of IVM, respectively, P < 0.05). Glutathione (GSH) content is an indicator of cytoplasmic maturation of oocytes. Reactive oxygen species (ROS) have a harmful effect on developmental competence of oocytes. For this, we determined the intraoocyte levels of GSH and ROS after 44 h of IVM. It was found that SAL increased intraoocyte GSH level and also decreased ROS level (P < 0.05). Finally, we performed somatic cell nuclear transfer (SCNT) after treating oocytes with 10 nM SAL during IVM. SAL treatment significantly improved blastocyst formation of SCNT embryos compared to control (39.6% vs. 24.7%, P < 0.05). Our results indicate that treatment of pig oocytes with ER stress inhibitor SAL during IVM improves preimplantation development PA and cloned pig embryos by influencing cytoplasmic maturation in terms of increased GSH content and decreased ROS level in IVM pig oocytes.

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참고문헌

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