title: Glutathione content of in vivo and in vitro matured canine oocytes collected from different reproductive stages.
abstract: Glutathione (GSH) concentrations of oocytes are considered as an important marker of the cytoplasmic maturation. The present study was designed to compare GSH concentrations of in vivo and in vitro matured canine oocytes. In vivo matured oocytes were collected 72 hr after ovulation by flushing fallopian tubes after laparotomy. Ovaries were collected from bitches with different reproductive stages, and collected oocytes were divided into 2 groups according to the size viz. < 120 microm and > 120 microm in diameter and cultured for 72 hr in Tissue Culture Medium-199 supplemented with 10% FBS, 2.2 mg/ml sodium bicarbonate, 2.0 microg/ml estrogen, 0.5 microg/ml FSH, 0.03 IU/ml hCG, and 1% penicillin-streptomycin solution in the presence or absence of 50 microM beta-mercaptoethanol. GSH concentrations were determined by the dithionitrobenzoic acid-glutathione disulfide (DTNB-GSSG) reductase recycling assay. GSH concentrations of immature canine oocytes were 2.9 and 3.8, 3.5 and 6.8, and 3.1 and 6.5 pM/oocyte for < 120 microm and > 120 microm in diameter oocyte groups at anestrous, follicular and luteal stage, respectively (P<0.05). In vivo matured oocytes had significantly higher GSH concentrations compared with in vitro matured oocytes. The GSH content was 19.2 pM/oocyte for in vivo matured oocytes, while 4.1 to 8.1 and 5.7 to 13.2 pM/oocyte for in vitro matured oocytes cultured in the absence or presence of beta-mercaptoethanol, respectively (P<0.05). Presence of beta-mercaptoethanol increased GSH synthesis in canine oocytes cultured in vitro, and oocytes collected from follicular and luteal stage was superior to anestrus oocytes.
authors.affiliation: Department of Theriogenology and Biotechnology, College of Veterinary Medicine, Seoul National University, Seoul, Korea.
authors.forename: Min Kyu
authors.initials: MK
authors.lastname: Kim
authors.forename: Mohammad Shamim
authors.initials: MS
authors.lastname: Hossein
authors.forename: Hyun Ju
authors.initials: HJ
authors.lastname: Oh
authors.forename: Heru Yuda
authors.initials: HY
authors.lastname: Fibrianto
authors.forename: Goo
authors.initials: G
authors.lastname: Jang
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: So Gun
authors.initials: SG
authors.lastname: Hong
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Park
authors.forename: Sung Keun
authors.initials: SK
authors.lastname: Kang
authors.forename: Byeong Chun
authors.initials: BC
authors.lastname: Lee
mesh_terms: D000818:Animals; D004285:Dogs; D030762:Estrous Cycle / Q000378:metabolism*; D005260:Female; D005978:Glutathione / Q000378:metabolism*; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*
chemical_list: D005978:Glutathione