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Ultrastructure of IVM-IVF bovine blastocysts vitrified after equilibration in glycerol 1,2-propanediol using 2-step and 16-step procedures.

Abstract：

:Two experiments were conducted to investigate the relationship between survival rates and ultrastructural appearance, using the freeze-replica technique, of bovine blastocysts after vitrification. In experiment 1, blastocysts obtained from in vitro-matured and in vitro-fertilized (IVM-IVF) bovine oocytes were either equilibrated in a stepwise manner in a vitrification solution (VS; 22.5% glycerol + 22.5% 1,2-propanediol) using 16 steps for 18 min in total (the 16-step method) or equilibrated with 10% glycerol + 20% 1,2-propanediol for 10 min and then exposed to VS (the 2-step method). The blastocysts were then vitrified by plunging them into liquid nitrogen. All samples were subsequently thawed in a water bath at 37 degrees C and cultured in vitro with a monolayer of cumulus cells. The survival rate obtained for blastocysts equilibrated by the 16-step method was 83.3% (25/30). In contrast, no blastocysts survived by the 2-step method (0/30). In experiment 2, freeze-replica observations were carried out on blastocysts vitrified by the 16-step method and the 2-step method. In all the blastocysts, no ice crystals were observed in the cytoplasm, blastocoelic cavity, or extracellular areas, which confirmed the occurrence of complete vitrification. Little ultrastructural change was observed in the plasma membrane of the blastocysts equilibrated by the 16-step method. In contrast, small vesicles and distinct intramembrane particle (IMP) aggregation were frequently observed in the plasma membranes of blastocysts equilibrated by the 2-step method. These results indicate that the successful cryopreservation of blastocysts following the 16-step equilibration requires not only complete vitrification, but also minimization of ultrastructural damage to the plasma membrane.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Kuwayama M,Fujikawa S,Nagai T

doi

10.1006/cryo.1994.1051

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

415-22

issue

5

eissn

0011-2240

issn

1090-2392

pii

S0011-2240(84)71051-0

journal_volume

31

pub_type

杂志文章

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