Biol Reprod 2009 SSR Annual Meeting Abstracts
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Biology of Reproduction, Vol 47, 1134-1139, Copyright © 1992 by Society for the Study of Reproduction

ARTICLES

Survival of mouse morulae vitrified in an ethylene glycol-based solution after exposure to the solution at various temperatures

M Kasai, M Nishimori, SE Zhu, T Sakurai and T Machida
Laboratory of Animal Science, College of Agriculture, Kochi University, Japan.

Mouse morulae were exposed in one step to a vitrification solution (EFS, a modified PBS containing 40% ethylene glycol, 18% Ficoll, and 0.3-M sucrose) at various temperatures, then cooled rapidly in liquid nitrogen, and then warmed rapidly. All of the embryos exposed to the EFS solution for 0.5 min at 25 degrees C before vitrification developed in culture. However, survival rates were lower if the duration of exposure was prolonged to 2, 5, or 10 min. At lower ambient temperatures (20, 10, and 5 degrees C), high survival rates were associated with longer exposure to the EFS solution. The toxicity of the EFS solution was also lower at lower temperatures. The toxic injury of morulae was manifested as decompaction of the blastomeres. Among the three additives in the EFS solution, ethylene glycol, which can cross cell membranes, was responsible for the toxicity. The results show that the optimum time for exposure of the embryos to the EFS solution before rapid cooling varies with the ambient temperature, i.e., 0.5 min at 25 degrees C, 0.5-5 min at 20 degrees C, 2-5 min at 10 degrees C, and 2-10 min at 5 degrees C. If they are exposed for an optimum period, almost all mouse morulae can survive vitrification (94-100%).


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Copyright © 1992 by the Society for the Study of Reproduction.