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Factors affecting the survival, fertilization, and embryonic development of mouse oocytes after vitrification using glass capillaries

文献类型： 外文期刊

作者： Tan, Xiuwen 1 ; Song, Enliang 1 ; Liu, Xiaomu 1 ; You, Wei 1 ; Wan, Fachun 1 ;

作者机构： 1.Shandong Acad Agr Sci, Inst Anim Husb & Vet Med, Shandong Key Lab Anim Dis Control & Breeding, Jinan 250100, Shandong, Peoples R China

关键词： Animals;Cell Survival;*Cryopreservation;Cryoprotective Agents;Dimethyl Sulfoxide;Embryonic Development;Ethylene Glycol;Female;*Fertilization in Vitro;Glass;Mice;Microtubules;Mitotic Spindle Apparatus;Oocytes;*Oocytes

期刊名称：IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL （ 影响因子：2.416； 五年影响因子：2.117 ）

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收录情况： SCI

摘要： Cryopreservation of mammalian oocytes is an important way to provide a steady source of materials for research and practice of parthenogenetic activation, in vitro fertilization, and nuclear transfer. However, oocytes cryopreservation has not been common used, as there still are some problems waiting to be solved on the repeatability, safety, and validity. Then, it is necessary to investigate the damage occurred from vitrification and find a way to avoid or repair it. In this study, mouse mature oocytes were firstly pretreated in different equilibrium media, such as 5% ethylene glycol (EG) + 5% dimethyl sulfoxide (DMSO), 10% EG + 10% DMSO, and 15% EG + 15% DMSO in TCM199 supplemented with 20% fetal calf serum (FCS), for 1, 3, and 5 min, respectively, and then oocytes were transferred into vitrification solution (20% EG, 20% DMSO, 0.3 M sucrose, and 20% FCS in TCM199, M2, Dulbecco's phosphate buffered saline, and 0.9% saline medium, respectively) and immediately loaded into glass capillaries to be plunged into liquid nitrogen. After storage from 1 h to 1 wk, they were diluted in stepwise sucrose solutions. The surviving oocytes were stained for cortical granule, meiotic spindles, and chromosomes. Oocytes without treatments were used as controls. The results showed that oocytes pretreated in 5% EG +5% DMSO group for 3-5 min or in 10% EG + 10% DMSO group for 1-3 min were better than other treatments. Oocytes vitrified in TCM199 as basic medium showed higher survival and better subsequent embryonic development than other groups. When the concentration of FCS in vitrification solution reduced below 15%, the rates of survival, fertilization, and developing to blastocyst declined dramatically. The inner diameter (0.6 mm) of glass capillaries and amount of vitrification solution (1-3 ol) achieved more rapid cooling and warming and so reduce the injury to oocytes. Cropreservation led to the exocytosis of cortical granule of oocytes (about 10%) and serious disturbance of microtubules and chromosomes. With 2 h incubation, the microtubules could repolymerize and the rate of fertilization in vitro was much higher than those of 1 and 3 h incubation groups. In conclusion, the protection of basic medium and FCS to oocytes during cryopreservation and sufficient cooling and warming rates using glass capillaries have profound effects on oocytes survival and subsequent embryonic development competence. The appropriate time for fertilization in vitro may be related to the recovery of spindles after incubation and avoiding ageing in the whole process.

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