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Biology of Reproduction, Vol 28, 235-247, Copyright © 1983 by Society for the Study of Reproduction
ARTICLES |
BD Bavister, ML Leibfried and G Lieberman
Eight-cell embryos were recovered from mated golden hamsters that had been superovulated with pregnant mare's serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG). Embryos were cultured for 24 or 32 h in a defined medium (modified Tyrode's solution) designed for fertilization of hamster oocytes in vitro. This medium was supplemented in some experiments with amino acids (glutamine, phenylalanine, methionine and isoleucine) and with vitamins (Eagle's Minimum Essential Medium vitamin supplement). At the end of the culture period, the numbers of embryos developing to the blastocyst stage were recorded. In other experiments, the effects of varying the osmotic pressure (225, 250, 275 and 300 m0smol/kg) and the pH (6.8 and 7.4) of the culture medium on blastocyst formation were examined. A difference was found between the ability of early 8-cell embryos (approx. 54 h post-egg activation) and late 8-cell embryos (approx. 62 h post-egg activation) to develop in culture. In the unsupplemented culture medium, only 2% of early 8-cell embryos developed to the blastocyst stage compared with 22% of late 8-cell embryos. A marked effect of the four amino acids on development was found. In the presence of amino acids 36% of early 8- cell embryos developed into blastocysts (18-fold increase). The amino acids also increased the percentage of late 8-cell embryos that developed into blastocysts from 22% to 66%. These data suggest that an important metabolic change may occur in hamster embryos during a critical period at the 8-cell stage of development. No additional effect on development was observed when vitamins were included in the culture medium. No significant effect of either osmotic pressure of pH of the culture medium on development was found. When blastocysts formed from cultured 8-cell embryos were transferred surgically to pseudopregnant hamsters, about 25% developed into normal-looking fetuses and 5 normal-looking young were born, 4 of which have survived. These results represent an approach towards achieving complete preimplantation development of hamster embryos in vitro.
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