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Antioxidant supplementation of culture medium during embryo development and/or after vitrification-warming; which is the most important?

  • ANIMAL EXPERIMENTATION
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Abstract

Purpose

To determine the most optimal stage for antioxidant supplementation of culture medium to improve developmental competence, cryotolerance and DNA-fragmentation of bovine embryos.

Methods

Presumptive zygotes were first cultured in presence or absence of β-mercaptoethanol (β-ME), for 8 days. Subsequently, half of the expanded blastocysts developed in both groups were vitrified, warmed within 30 min and post-warming embryos along with their corresponding non-vitrified embryos were cultured for two further days in presence or absence of (100 µM) βME.

Results

For vitrified and non-vitrified embryos, the best effect was found when βME was added from day 1 of in vitro culture in continuation with post-warming culture period. Day 1–8 supplementation significantly increased the rates of cleavage, day 7 and day 8 blastocyst production. For non-vitrified embryos, βME addition during day 1–8 and/or 9–10 of embryo culture improved both hatching rate and quality of hatched embryos. For vitrified embryos, however, the percentage of DNA-fragmentation (18.5%) was significantly higher (p ≤ 0.05) than that of embryos developed in absence of βME but supplemented with βME during post-warming period (13.5%).

Conclusions

Exogenous antioxidant increases the chance of embryos, even those of fair-quality, to develop to blastocyst. However, antioxidant inclusion during in vitro embryo development is not sufficient to maintain the redox state of these embryos during the critical period of post-warming embryo culture, and therefore, there should be a surplus source of exogenous antioxidant during post-warming embryo culture.

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Acknowledgments

This study was funded by the grant of Royan Institute of I.R.I. The authors would like to thank Dr. H. Gurabi and Dr. A. Vosough for their full support.

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Correspondence to Mohammad H. Nasr-Esfahani.

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Hosseini, S.M., Forouzanfar, M., Hajian, M. et al. Antioxidant supplementation of culture medium during embryo development and/or after vitrification-warming; which is the most important?. J Assist Reprod Genet 26, 355–364 (2009). https://doi.org/10.1007/s10815-009-9317-7

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  • DOI: https://doi.org/10.1007/s10815-009-9317-7

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