Abstract
Objective
To determine the direct effect of physiologically relevant high temperatures (40.5 and 41.5 °C) for two time periods (12 and 24 h) on bubaline oocytes during in vitro maturation.
Method
The control group oocytes were cultured at 38.5 °C for 24 h. The treatment 1 (T1) and 3 (T3) group oocytes were cultured at 40.5 and 41.5 °C respectively, for the first 12 h and at 38.5 °C for rest of the 12 h. However, treatment 2 (T2) and 4 (T4) group oocytes were cultured at 40.5 and 41.5 °C for complete 24 h.
Results
Development of oocytes to blastocyst was severely compromised (p < 0.001) when matured at 40.5 and 41.5 °C for both exposure periods (12 h and 24 h). It was found that the cleavage rates, blastocyst yield and mean cell number decreased remarkably (p < 0.001) in the treatment groups compared to control. The relative mRNA expression of heat shock protein (Hsp 70.1, 70.2, 70.8, 60, 10 and HSF1), pro-apoptotic (caspases-3, −7, −8, Bid and Bax) and oxidative stress (iNOS) related genes was significantly higher (p < 0.05) in all the treatment groups compared to control. However, mRNA abundance of anti-apoptotic (Bcl-2, Mcl-1, Bcl-xl), glucose transport (Glut1, Glut3 and IGF1R), developmental competence (ZAR1 and BMP15) and oxidative stress (MnSOD) related genes was significantly decreased (p < 0.05) in the treatment groups compared to control.
Conclusion
The present study clearly establishes that physiologically relevant elevated temperatures during in vitro meiotic maturation reduce developmental competence of bubaline oocytes.
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Acknowledgments
This study was supported by National Initiative on Climate Resilient Agriculture (NICRA; Grant No: 2049/3033), Indian Council of Agricultural Research, New Delhi. The authors express sincere gratitude to the Director, National Dairy Research Institute, Karnal for providing the necessary facilities.
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Capsule Oocyte maturation is the very first and critical stage in the overall embryo development. Therefore, exploiting the genetic determinants of oocyte might prove helpful in alleviating the embryonic losses in buffalo due to heat stress.
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Ashraf, S., Shah, S.M., Saini, N. et al. Developmental competence and expression pattern of bubaline (Bubalus bubalis) oocytes subjected to elevated temperatures during meiotic maturation in vitro. J Assist Reprod Genet 31, 1349–1360 (2014). https://doi.org/10.1007/s10815-014-0275-3
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DOI: https://doi.org/10.1007/s10815-014-0275-3