RESUMO
BACKGROUND: Oocytes that survive cryopreservation may accumulate ROS which are known to bring harmful effects on embryonic development. NAC is an antioxidant which can be a supplement to reduce oxidative stress. However, whether NAC can improve the developmental competence of vitrified GV-oocytes remains unclear. OBJECTIVE: The study was to investigate the effect of NAC on subsequent embryonic developmental competence of mice vitrified GV-oocytes. MATERIALS AND METHODS: This study compared the effects of different concentration of NAC on the cleavage and blastocyst rates of mice vitrified GV-oocytes. Then the effects of NAC on mitochondria distribution, ROS level and embryonic development of vitrified oocytes were tested. RESULTS: ROS activity of vitrified oocytes was significantly annihilated and mitochondrial distribution pattern was improved by 1.5 mM NAC (P<0.05). NAC supplementation throughout vitrification/warming and IVM media significantly improved the developmental competence of vitrified oocytes. CONCLUSION: Supplementation of NAC could partially overcome the damages by vitrification and improve the development ability of mice vitrified GV-oocytes.