Abstract
Purpose
To investigate the effects of Insulin like growth factor-1 (IGF-1) on bovine oocyte developmental competence under heat stress.
Methods
In Experiment 1, bovine cumulus-oocyte complexes (COCs) were cultured at 38.5 or 41°C for the first 12 h of maturation in the presence of either 100 ng/ml human recombinant (hr)-IGF-1 or acetic acid. In Experiment 2, COCs were cultured in 38.5 or 41°C for the first 12 h of maturation in the presence either of 100 ng/ml hr-IGF-1 or acetic acid. After fertilization, putative zygotes were cultured for 8 days.
Results
In experiment 1, addition of rh-IGF-1 to maturation medium at 38.5°C significantly increased the proportion of M II oocytes and decreased the percentage of TUNEL-positive oocytes compared to the other groups. However, addition of rh-IGF-1 to maturation medium under heat stress increased the percentage of TUNEL-positive oocytes. In experiment 2, addition of rh-IGF-1 under heat sress did not affect cleavage rate, whereas, blastocyst formation rate decreased in heat-stressed and heat-stressed plus rh-IGF-1 groups. Similarly, The number of trophectoderm cells and total cell number were decreased in heat-stressed and heat-stressed plus rh-IGF-1 groups and the percentage of TUNEL-positive nuclei were increased in heat-stressed and heat-stressed plus rh-IGF-1 groups compared to the other groups.
Conclusion
The results of the present study demonstrate that IGF-1 decreases oocyte developmental competence and total cell number and increases TUNEL-positive nuclei at heat stress condition. These unexpected results of IGF-1 during maturation period under heat stress condition warrant further optimizations and investigations.
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Acknowledgments
This study was funded by Royan institute of Iran, grant number 86/31684. The authors would like to thank University of Tehran and M. Hajian and L. Hosseini from the laboratory of the Royan institute, Isfahan campus for their technical supports.
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Capsule Bovine oocyte developmental competance is decreased by simultaneously effect of IGF-1 and heat stress.
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Zhandi, M., Towhidi, A., Nasr-Esfahani, M.H. et al. Unexpected detrimental effect of Insulin like growth factor-1 on bovine oocyte developmental competence under heat stress. J Assist Reprod Genet 26, 605–611 (2009). https://doi.org/10.1007/s10815-009-9364-0
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DOI: https://doi.org/10.1007/s10815-009-9364-0