Journal
THERIOGENOLOGY
Volume 158, Issue -, Pages 290-296Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.theriogenology.2020.09.026
Keywords
Bovine embryos; Vitrification; Apoptosis; Cryosurvival; Cryobiology; Post-cryopreservation resumption of development
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Funding
- CNPq, National Council of Scientific and Technological Development - Brazil [446647/2014-4]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel SuperioreBrasil (CAPES) [1]
- Sao Paulo Research Foundation (FAPESP) - Brazil [2019/16239-9]
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Embryonic morphofunctional competence features regulating post-cryopreservation resumption of development are still poorly understood. In this study, we investigated the correlation between embryonic viability and the speed and ability to resume post-cryopreservation development. Thus, in vitro produced blastocysts were vitrified by the Cryotop method using standard protocols. Subsequently, the embryos were warmed, re-cultured, and classified into groups according to their speed and ability to resume post-cryopreservation development: embryos not re-expanded at 12h (NE12); embryos reexpanded at 12h and hatched at 24h (E12H24); embryos re-expanded at 12h and hatched at 48h (E12H48); embryos re-expanded at 12h and not hatched at 48h (E12NH48). Subsequently, the embryos were subjected to monitoring of total cell number and apoptosis. We identified that the blastocoel's ability to re-expand was negatively affected by the significant higher percentage of apoptotic cells observed in the NE12 group than in the other groups. A greater (P < 0.05) number of total cells, found in groups E12H24 and E12H48, seems to have a positive influence on the hatching capacity of blastocysts after cryopreservation. In conclusion, the total number of cells and apoptotic index correlated with the speed and ability to resume post-cryopreservation development. Apoptosis was a determinant for embryonic re-expansion, and the total cell number was crucial for blastocyst hatching. (C) 2020 Elsevier Inc. All rights reserved.
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