The effect of cryopreservation on functional correlates of embryo integrity

J. Carroll, P. L. Kaye, J. M. Cummins

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To assess possible functional effects of the procedures involved in freezing/thawing of mammalian embryos, uptake of3H-glycine and125I-BSA (bovine serum albumin) was measured in mouse two-cell embryos and morulae before and after freezing. None of the procedures of dehydration, rehydration, or freezing affected glycine uptake significantly. Earlier results for uptake of125I-BSA by fresh embryos which indicated an increase in endocytic activity between morula and blastocyst stages were confirmed, and hydrolysis of endocytosed125I-BSA by morulae but not two-cell embryos was observed. Only 53 ±9% of two-cell embryos but 83±7% of morulae were apparently normal after freezing and thawing. Apparently normal frozen/thawed two-cell embryos were twice as active in125I-BSA uptake as controls. This was not the case for morulae. The results suggest that freezing/ thawing effects endocytotic processes in two-cell embryos but not morulae.

Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalJournal of In Vitro Fertilization and Embryo Transfer
Issue number2
Publication statusPublished - 1 Apr 1988
Externally publishedYes


  • amino acid uptake
  • cryopreservation
  • endocytosis
  • mouse embryo

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