Journal of Veterinary Medical Science | |
Development of In Vitro Matured/Fertilized Bovine Embryos in a Chemically Defined Medium : Influence of Oxygen Concentration in the Gas Atmosphere | |
Motozumi MATSUI1  Yoshiyuki TAKAHASHI1  Hozumi TANAKA1  Hiroshi KANAGAWA1  Mitsugu HISHINUMA1  | |
关键词: bovine; culture; defined medium; embryo; oxygen; | |
DOI : 10.1292/jvms.58.897 | |
学科分类:兽医学 | |
来源: Japanese Society of Veterinary Science | |
【 摘 要 】
References(37)Cited-By(42)The influence of oxygen concentrations in the gas atmosphere on the development of IVM/IVF bovine embryos was determined by culturing them in a microdrop of modified synthetic oviduct fluid medium supplemented with amino acids, insulin and PVA (mSOFai). After removing the cumulus cells at 18 hr post-insemination, presumptive zygotes were cultured in mSOFai for 104-106 hr under 5% CO2 with various O2 concentrations (2.5 to 20%). Reduced O2 (5-10%) improved the development to the morula stage, and 5% O2 gave the highest development. In the next experiment, morulae obtained after 102-104 hr of culture, were further cultured for 50 hr in mSOFai with 2 mM glucose under 5 and 20% O2. An increase in the mean cell number in blastocysts, but not in the frequency of blastocysts, was observed under 5% O2. In the third experiment, zygotes were cultured for 152-154 hr in mSOFai under 5 and 20% O2, or cocultured with bovine oviduct epithelial cells in TCM199 + 10% FCS under 5% CO2 in air. Percentage of blastocysts for mSOFai in 5% O2 doubled to that for 20% O2, and was similar to that for coculture. Moreover, mean cell number in the blastocysts for mSOFai in 5% O2 was significantly higher than that for coculture. Results demonstrate that oxygen concentration critically affects embryonic development through zygotes to blastocysts, and suggest that around 5% O2 is optimal. It also indicates that bovine zygotes can be cultured up to the blastocyst stage using a chemically defined medium with rates similar to those of a conventional coculture system.
【 授权许可】
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