title: Recent progress in cryopreservation of bovine oocytes.
abstract: Principle of oocyte cryoinjury is first overviewed and then research history of cryopreservation using bovine oocytes is summarized for the last two decades with a few special references to recent progresses. Various types of cryodevices have been developed to accelerate the cooling rate and applied to the oocytes from large domestic species enriched with cytoplasmic lipid droplets. Two recent approaches include the qualitative improvement of IVM oocytes prior to the vitrification and the short-term recovery culture of vitrified-warmed oocytes prior to the subsequent IVF. Supplementation of L-carnitine to IVM medium of bovine oocytes has been reported to reduce the amount of cytoplasmic lipid droplets and improve the cryotolerance of the oocytes, but it is still controversial whether the positive effect of L-carnitine is reproducible. Incidence of multiple aster formation, a possible cause for low developmental potential of vitrified-warmed bovine oocytes, was inhibited by a short-term culture of the postwarm oocytes in the presence of Rho-associated coiled-coil kinase (ROCK) inhibitor. Use of an antioxidant α-tocopherol, instead of the ROCK inhibitor, also supported the revivability of the postwarm bovine oocytes. Further improvements of the vitrification procedure, combined with pre- and postvitrification chemical treatment, would overcome the high sensitivity of bovine oocytes to cryopreservation.
authors.affiliation: Interdisciplinary Graduate School of Science and Technology, Shinshu University, Tokida 3-15-1, Ueda, Nagano 386-8567, Japan ; Animal Biotechnology Division, National Institute of Animal Science, Rural Development Administration, Seosuwon-ro 143-13, Suwon, Gyeonggi-do 441-706, Republic of Korea.
authors.forename: In-Sul
authors.identifier: 0000-0003-2949-3075
authors.initials: IS
authors.lastname: Hwang
authors.affiliation: Interdisciplinary Graduate School of Science and Technology, Shinshu University, Tokida 3-15-1, Ueda, Nagano 386-8567, Japan ; Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Ueda, Nagano 386-8567, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Hochi
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology; D002417:Cattle; D002478:Cells, Cultured; D015925:Cryopreservation; D005307:Fertilization in Vitro; D059471:In Vitro Oocyte Maturation Techniques; D009865:Oocytes / Q000166:cytology / Q000254:growth & development*; D054460:rho-Associated Kinases / Q000378:metabolism*
chemical_list: D054460:rho-Associated Kinases
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