Melatonin improves the first cleavage of parthenogenetic embryos from vitrified-warmed mouse oocytes potentially by promoting cell cycle progression  

作　　者：Bo Pan Izhar Hyder Qazi Shichao Guo Jingyu Yang Jianpeng Qin Tianyi Lv Shengqin Zang Yan Zhang Changjun Zeng Qingyong Meng Hongbing Han Guangbin Zhou 

机构地区：[1]Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province,College of Animal Science and Technology,Sichuan Agricultural University,Chengdu 611130,China [2]Department of Veterinary Anatomy and Histology,Shaheed Benazir Bhutto University of Veterinary and Animal Sciences,Sakrand,Sindh 67210,Pakistan [3]State Key Laboratory of AgroBiotechnology,China Agricultural University,Beijing 100193,China [4]National Engineering Laboratory for Animal Breeding,Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture,Beijing Key Laboratory for Animal Genetic Improvement,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China

出　　处：《Journal of Animal Science and Biotechnology》2022年第1期106-122,共17页畜牧与生物技术杂志（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant no.32072735,31572398);the Natural Science Fund of Qinghai Province(2020-ZJ-902);by the China Agriculture Research System(grant no.CARS-36).

摘　　要：Background:This study investigated the effect of melatonin(MT)on cell cycle(G1/S/G2/M)of parthenogenetic zygotes developed from vitrified-warmed mouse metaphase II(MII)oocytes and elucidated the potential mechanism of MT action in the first cleavage of embryos.Results:After vitrification and warming,oocytes were parthenogenetically activated(PA)and in vitro cultured(IVC).Then the spindle morphology and chromosome segregation in oocytes,the maternal mRNA levels of genes including Miss,Doc1r,Setd2 and Ythdf2 in activated oocytes,pronuclear formation,the S phase duration in zygotes,mitochondrial function at G1 phase,reactive oxygen species(ROS)level at S phase,DNA damage at G2 phase,early apoptosis in 2-cell embryos,cleavage and blastocyst formation rates were evaluated.The results indicated that the vitrification/warming procedures led to following perturbations 1)spindle abnormalities and chromosome misalignment,alteration of maternal mRNAs and delay in pronucleus formation,2)decreased mitochondrial membrane potential(MMP)and lower adenosine triphosphate(ATP)levels,increased ROS production and DNA damage,G1/S and S/G2 phase transition delay,and delayed first cleavage,and 3)increased early apoptosis and lower levels of cleavage and blastocyst formation.Our results further revealed that such negative impacts of oocyte cryopreservation could be alleviated by supplementation of warming,recovery,PA and IVC media with 10^(−9) mol/L MT before the embryos moved into the 2-cell stage of development.Conclusions:MT might promote cell cycle progression via regulation of MMP,ATP,ROS and maternal mRNA levels,potentially increasing the first cleavage of parthenogenetic zygotes developed from vitrified-warmed mouse oocytes and their subsequent development.

关 键 词：Cell cycle Cleavage rate MELATONIN MetaphaseⅡoocyte Parthenogenetic activation VITRIFICATION 

分 类 号：S813[农业科学—畜牧学]