Effects of oxygen tension in the gas atmosphere during in vitro maturation, in vitro fertilization and in vitro culture on the efficiency of in vitro production of mouse embryos.
Effects of oxygen (O2) tension in the gas atmosphere during in vitro maturation (IVM), in vitro fertilization (IVF) and in vitro culture (IVC) on the efficiency of in vitro production of mouse embryos were examined. Mouse oocytes recovered from large antral follicles were subjected to IVM in Waymouth medium for 15, 16 and 17 hr under 5 or 20% O2 and then subjected to IVF and IVC under 5 or 20% O2 tension. Lowering the O2 tension in the gas atmosphere for IVM from 20 to 5% improved the cleavage rate after IVF when the oocytes were subjected to IVM for 15 hr; however, no improvement in the cleavage rate was observed when the culture period for IVM was extended to 16 and 17 hr. Lowering the O2 tension to 5% for IVM and IVC improved the development of the cleaved oocytes to the blastocyst stage, regardless of the culture period for IVM. However, the O2 tension for IVF had no remarkable effect on the subsequent embryonic development. These results demonstrate that 5% O2 is superior to 20% O2 for IVM and IVC, and suggest that 20% O2 for IVM may delay oocyte maturation and/or the acquisition of fertilizability and impair the developmental competence of oocytes.
Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan.
Ahmed Abdel Gadir
AA
Adam
Yoshiyuki
Y
Takahashi
Seiji
S
Katagiri
Masashi
M
Nagano
D000818:Animals; D018929:Cell Culture Techniques / Q000379:methods; D002455:Cell Division / Q000187:drug effects / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D004622:Embryo, Mammalian / Q000187:drug effects* / Q000502:physiology*; D005314:Embryonic and Fetal Development / Q000187:drug effects / Q000502:physiology; D005260:Female; D005307:Fertilization in Vitro / Q000662:veterinary; D008297:Male; D051379:Mice / Q000196:embryology*; D008813:Mice, Inbred ICR; D009865:Oocytes / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D010100:Oxygen / Q000378:metabolism / Q000494:pharmacology*; D011897:Random Allocation; D013997:Time Factors
D010100:Oxygen