BACKGROUND: The in vitro rabbit embryo production and their cryopreservation methodologies such as vitrification generate less viable embryos, and occasionally, with significant differences from those that are not subjected to any treatment. Besides, in vitrified rabbit embryos
little information is available about exactly when and where begin to emerge the first differences that finally result in foetal losses comparing with non-vitrified embryos. OBJECTIVE: The aim of this study was to evaluate the vitrification effects on the early in vitro gastrulation
events. MATERIALS AND METHODS: After oviductal transfers of vitrified and non-vitrified embryos (control) in rabbit recipients, blastocysts from 144h (6-day-old) were recovered and cultured into TCM199 supplemented with rabbit homologous serum media for 48 hours. Gastrula stage and
measures of perimeter and area of blastocyst and gastrula were noted. Moreover, eight independent pools consisting of six embryos each one were generated for each experimental group (control and vitrified) and total RNA was isolated to study the OCT4 gene expression. RESULTS: Of 151
control and 164 vitrified morulae transferred, 69.5% and 70.1% developed in vivo to 6-day-old blastocyst respectively. After 24 hour of in vitro culture, 41.8% of vitrified blastocyst had begun the neurulation (stage 5-) versus 22.8% of control group. Nevertheless, the vitrified
group showed the highest percentage of collapsed blastocyst at 48 hours (26.8%). Non morphometric differences differences were observed in perimeter and area of blastocyst and gastrula between control and vitrified group at 0 and 24 hours. By contrast, perimeter and gastrula areas were slightly
higher for the vitrified group than those for the control group at 48 hours of in vitro culture CONCLUSION: The study reveal the existence of the first morphological differences in vitrified blastocysts of 7 and 8-day-old, marked by a further development of gastrulation in the
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Document Type: Research Article
Publication date: March 1, 2015
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.