title: Effect of different cryo-devices on in vitro maturation and development of vitrified-warmed immature buffalo oocytes.
abstract: The aim of the study was to identify a cryo-device that would be best suited for the vitrification of buffalo immature cumulus-oocyte complexes (COCs) as judged by viability and meiotic competence of the vitrified-warmed oocytes and their development ability following in vitro fertilization (IVF). The expression of oocyte secreting factors and their receptors (GDF9, BMP15, BMPR2, TGFBR1) and apoptosis related genes (BCL2, BAX, P53, C-MYC) were compared in vitrified-warmed oocytes after in vitro maturation. COCs from the ovaries of slaughtered buffaloes were vitrified in a combination of dimethyl sulfoxide, ethylene glycol, and sucrose using either a conventional straw (CS), open pulled straw (OPS), cryoloop (CL), hemistraw (HS) or cryotop (CT). The fresh COCs were exposed to vitrification and warming solutions as in other vitrification methods without plunging in to liquid nitrogen (EC). The viability of vitrified-warmed COCs, 2 h post warming in HS and CT was similar to fresh and EC groups but significantly higher than CS and OPS methods. The proportions of oocytes with first polar body after 24 h in vitro maturation were significantly higher in HS and CT methods than in CS, OPS and CL methods. The development ability of these vitrified-warmed oocytes to blastocyst stage following IVF in all vitrified groups was significantly lower than control and EC groups. Among the vitrified groups, the blastocyst rate in HS, CT and CL groups was significantly higher than in OPS and CS groups. It was also observed that the expression levels of GDF9, BMP15, BMPR2, TGFBR1, BCL2, BAX, P53 and C-MYC genes in vitrified-warmed COCs in CT, HS and CL groups were similar to control. The results indicated that HS, CT and CL are more suitable cryo-devices for vitrification of buffalo immature oocytes.
authors.affiliation: CSIR- Centre for Cellular and Molecular Biology (CCMB), Hyderabad 500007, India.
authors.forename: Yelisetti Uma
authors.initials: YU
authors.lastname: Mahesh
authors.affiliation: CSIR- Centre for Cellular and Molecular Biology (CCMB), Hyderabad 500007, India.
authors.forename: Henderson Rose Winnie
authors.initials: HRW
authors.lastname: Gibence
authors.affiliation: CSIR- Centre for Cellular and Molecular Biology (CCMB), Hyderabad 500007, India.
authors.forename: Sisinthy
authors.initials: S
authors.lastname: Shivaji
authors.affiliation: CSIR- Centre for Cellular and Molecular Biology (CCMB), Hyderabad 500007, India. Electronic address: sambasiva@ccmb.res.in.
authors.forename: Brahmasani Sambasiva
authors.initials: BS
authors.lastname: Rao
mesh_terms: D000818:Animals; D002020:Buffaloes; D015925:Cryopreservation / Q000295:instrumentation* / Q000379:methods*; D003451:Cryoprotective Agents / Q000494:pharmacology*; D054885:Cumulus Cells / Q000187:drug effects*; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D019855:Ethylene Glycol / Q000494:pharmacology; D005260:Female; D009865:Oocytes / Q000187:drug effects; D058989:Vitrification
chemical_list: D003451:Cryoprotective Agents; D019855:Ethylene Glycol; D004121:Dimethyl Sulfoxide
keywords: Buffalo; Cryo-devices; Gene expression; Immature oocytes; Oocyte secreted factors; Vitrification