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Effects of vitrification on blastomere viability and cytoskeletal integrity in mouse embryos

Published online by Cambridge University Press:  07 December 2016

Zenon Oikonomou
Affiliation:
Unit of Human Reproduction, 1st Department of Obstetrics and Gynaecology, Medical School, Aristotle University, Papageorgiou General Hospital, Thessaloniki, Greece.
Katerina Chatzimeletiou*
Affiliation:
Unit for Human Reproduction, 1st Department of Obstetrics & Gynaecology, Medical School, Aristotle University, Papageorgiou General Hospital, Thessaloniki, 56403, Greece.
Antonia Sioga
Affiliation:
Laboratory of Histology and Embryology, Medical School, Aristotle University, Thessaloniki, Greece.
Louisa Oikonomou
Affiliation:
Laboratory of Histology and Embryology, Medical School, Aristotle University, Thessaloniki, Greece.
Basil C. Tarlatzis
Affiliation:
Unit of Human Reproduction, 1st Department of Obstetrics and Gynaecology, Medical School, Aristotle University, Papageorgiou General Hospital, Thessaloniki, Greece.
Efstratios Kolibianakis
Affiliation:
Unit of Human Reproduction, 1st Department of Obstetrics and Gynaecology, Medical School, Aristotle University, Papageorgiou General Hospital, Thessaloniki, Greece.
*
All correspondence to: Katerina Chatzimeletiou. Unit for Human Reproduction, 1st Department of Obstetrics & Gynaecology, Medical School, Aristotle University, Papageorgiou General Hospital, Thessaloniki, 56403, Greece. Tel: +30 231 332 3827; E-mail: katerinachatzime@hotmail.com

Summary

Vitrification is widely used to cryopreserve supernumerary embryos following in vitro fertilization (IVF). The mouse model was used to investigate the effects of vitrification on blastomere viability, using viability markers, and on the cytoskeleton, by analysing spindle/chromosome configurations, using confocal scanning microscopy. Ninety cleavage and morula stage dimethyl sulphoxide (DMSO)/EG vitrified mouse embryos were either processed immediately following warming for viability assessment by labelling with the fluorescent markers carboxyfluorescein-diacetate succinimidylester (CFSE) and propidium iodide (PI) or were cultured to the blastocyst stage and immunostained with α-tubulin antibody to visualize microtubules and DAPI or PI to visualize DNA. Sixty-five fresh embryos were also used as the control. Vitrified embryos showed high survival rates following warming, but they had a higher incidence of damaged blastomeres compared with fresh embryos. Most mitotic spindles examined in all groups were normal, but multivariable analysis revealed that the proportion of abnormal spindles was significantly higher in vitrified/warmed embryos (P < 0.05). This study is the first to examine the immediate effects of vitrification on blastomere viability, using fluorescent markers and shows that although vitrification results in a higher incidence of damaged blastomeres, vitrified embryos may compensate for this limited number of damaged/abnormal cells, as development to the blastocyst stage was not compromised.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016 

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