Abstract
Purpose
Antioxidant and anti-apoptotic effects of melatonin on development of in vitro fertilization (IVF)/vitrified two-cell mouse embryos were evaluated in this study.
Methods
The IVF two-cell embryos were vitrified by cryotop, and were cultured in KSOM medium in different concentrations of melatonin (10−6, 10−9, 10−12 M) and without melatonin. The blastocyst cell number, apoptotic cells and glutathione (GSH) level were evaluated by differential, TUNEL and cell tracker blue staining, respectively. The expression of Bax and Bcl-xl genes was evaluated by qPCR. The expression of melatonin receptors (Mtnr1a and Mtnr1b) in mouse 2-cell embryos and blastocysts was evaluated by RT-PCR.
Results
Melatonin increased the rate of cleavage and blastulation at 10−12 M concentration (p < 0.05). The number of trophectoderm and inner cell mass showed a significant increase (p < 0.05) in 10−9 M melatonin. The 10−9 M and 10−12 M melatonin treatments significantly reduced (p < 0.05) the apoptotic index. The significant increase in the expression of Bcl-xl observed at 10−9 M concentration however, reduced expression of Bax was not statistically significant. The levels of GSH in 10−9 and 10−12 M groups were significantly improved relative to the control group (p < 0.05). The Mtnr1a was expressed in 2-cell embryos and blastocysts in all groups, but the expression of Mntr1b was not detected.
Conclusion
Melatonin may have a special role against oxidative stress in protection of IVF/vitrified embryos.
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Acknowledgments
This paper was taken from the master’s thesis research project by Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical sciences.
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Capsule Exogenous melatonin has been found to affect BCL-xl expression and enhance in vitro developmental potenial of mice embryos after vitrification.
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Dehghani-Mohammadabadi, M., Salehi, M., Farifteh, F. et al. Melatonin modulates the expression of BCL-xl and improve the development of vitrified embryos obtained by IVF in mice. J Assist Reprod Genet 31, 453–461 (2014). https://doi.org/10.1007/s10815-014-0172-9
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DOI: https://doi.org/10.1007/s10815-014-0172-9