Article (Scientific journals)
Effect of conventional controlled-rate freezing and vitrification on quality of bovine blasotcysts produced in vitro
Kaidi, Safia; Bernard, S.; Lambert, Philippe et al.
2001In Biology of Reproduction, 65, p. 1127-1134
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Keywords :
developmental biology; early development; in vitro fertilization
Abstract :
[en] This study compares the effects of conventional controlled-rate freezing and vitrification on the morphology and metabolism of in vitro-produced bovine blastocysts. Day 7 expanded blastocysts cultured in synthetic oviduct fluid with 5% fetal calf serum were frozen in 1.36 M glycerol, 0.25 M sucrose or vitrified in 25% glycerol, 25% ethylene glycol. Cell alterations and in vitro development were evaluated immediately after thawing or after 72 h. The effect of cryopreservation on inner cell mass and trophectoderm (TE) cell number as well as glucose, pyruvate, and oxygen uptakes, and lactate release by blastocysts were evaluated. Immediately after thawing, blastocysts showed equivalent cell membrane permeabilization after both cryopreservation procedures, while alterations in nuclear staining were more frequent in vitrified embryos. After culture, similar survival and hatching rates were observed. Both procedures decreased cell number immediately after thawing and after 72 h. However, the number of TE cells was lower in frozen embryos than in vitrified ones. In relation to this, frozen blastocysts showed a decrease in glucose, pyruvate, and oxygen uptake, although those parameters were not altered in vitrified embryos. An increased glycolytic activity was also observed in frozen embryos, indicating a stress response to this procedure.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Kaidi, Safia
Bernard, S.
Lambert, Philippe  ;  Université de Liège - ULiège > Institut des sciences humaines et sociales > Méthodes quantitatives en sciences sociales
Massip, A.
Donnay, I.
Language :
English
Title :
Effect of conventional controlled-rate freezing and vitrification on quality of bovine blasotcysts produced in vitro
Publication date :
2001
Journal title :
Biology of Reproduction
ISSN :
0006-3363
eISSN :
1529-7268
Publisher :
Society for the Study of Reproduction, Madison, United States - Wisconsin
Volume :
65
Pages :
1127-1134
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 September 2009

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