title: Effects of thiol compounds on in vitro maturation of canine oocytes collected from different reproductive stages.
abstract: Various thiol compounds are known to improve cytoplasmic and/or nuclear maturation of oocytes in vitro. The present study examined the effects of two thiol compounds, cysteine (0.1, 0.5, and 1.0 mM) and cysteamine (50, 100, and 200 microM), on cytoplasmic and nuclear maturation of canine oocytes. Oocytes collected from different reproductive stages were cultured in TCM-199 supplemented with 10% fetal bovine serum, 2.2 mg/ml sodium carbonate, 2.0 microg/ml estrogen, 0.5 microg/ml FSH, 0.03 IU/ml hCG, and 1% penicillin-streptomycin solution for 72 h. Data were analyzed by two-way ANOVA after arcscine transformation and protected by Bonferroni post hoc test. The effects of cysteine and cysteamine on canine IVM were varied depending on the reproductive stage of oocyte donor bitches. In the follicular stage, significantly more oocytes reached the metaphase II (M II) stage when cultured with 0.5 or 1.0 mM cysteine (16.7% and 16.9%, respectively) compared to the control (6.2%). In the follicular stage, cysteamine increased oocyte maturation rate upto the M II stage (15.1% to 17.0%) compared to the control (4.4%). Both the 0.5 mM cysteine and 100 microM cysteamine, alone or together, increased the intracellular GSH level of canine oocytes compared to the control. Irrespective of reproductive stage, no further beneficial effects on nuclear or cytoplasmic maturation were observed when 0.5 mM cysteine and 100 microM cysteamine were supplemented together. In conclusion, addition of 0.5 mM cysteine and 100 microM cysteamine to the maturation medium improved IVM of canine oocytes.
authors.affiliation: Department of Theriogenology and Biotechnology, College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea.
authors.forename: Mohammad Shamim
authors.initials: MS
authors.lastname: Hossein
authors.forename: Min Kyu
authors.initials: MK
authors.lastname: Kim
authors.forename: Goo
authors.initials: G
authors.lastname: Jang
authors.forename: Hyun Joo
authors.initials: HJ
authors.lastname: Oh
authors.forename: Okjae
authors.initials: O
authors.lastname: Koo
authors.forename: Jeong Joo
authors.initials: JJ
authors.lastname: Kim
authors.forename: Sung Keun
authors.initials: SK
authors.lastname: Kang
authors.forename: Byeong Chun
authors.initials: BC
authors.lastname: Lee
authors.forename: Woo Suk
authors.initials: WS
authors.lastname: Hwang
mesh_terms: D000818:Animals; D018929:Cell Culture Techniques; D003543:Cysteamine / Q000494:pharmacology*; D003545:Cysteine / Q000494:pharmacology*; D004285:Dogs; D005260:Female; D009865:Oocytes / Q000187:drug effects* / Q000254:growth & development; D012098:Reproduction; D013438:Sulfhydryl Compounds / Q000494:pharmacology*
chemical_list: D013438:Sulfhydryl Compounds; D003543:Cysteamine; D003545:Cysteine