High survival rate of unfertilized mouse oocytes after vitrification.
Unfertilized mouse oocytes were cooled rapidly by directly plunging them into liquid nitrogen, immediately after exposure to a highly concentrated solution (modified VS1: 2.53 M-dimethyl sulphoxide, 2.36 M-acetamide, 1.19 M-propylene glycol, 5.4% (w/v) polyethylene glycol (Mr 8000) in PB1), and later warmed in a 37 degree C waterbath. After warming, 305 out of 348 oocytes (87.6%) were morphologically normal. After fertilization in vitro of cryopreserved oocytes, the proportions of pronuclear oocytes and 2-cell embryos 5 and 24 h after insemination were 81.6% (124/152) and 78.4% (120/153), respectively. All 2-cell embryos obtained from cryopreserved oocytes were transferred to the oviducts of pseudopregnant recipients and 45.8% (55/120) developed to normal young.
Nakagata
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Central Laboratory of Medical Sciences, Juntendo University School of Medicine, Tokyo, Japan.
D000818:Animals; D002470:Cell Survival; D015925:Cryopreservation / Q000379:methods*; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006824:Hybridization, Genetic; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009865:Oocytes / Q000166:cytology / Q000502:physiology*