Abstract
Purpose
Hypoxia inducible factors (HIFs) are key regulators of oxygen homeostasis in response to reduced oxygenation in somatic cells. In addition, HIF-1α protein can be also induced by insulin-like growth factor I (IGF-I) treatment in various cell lines under normoxic condition. However, the expression and function of HIF-1α in embryogenesis are still unclear. Therefore, the objectives of this study were to examine the expression of HIF-1α in mouse blastocysts cultured under hypoxic and normoxic conditions, and to determine whether oxygen tension and IGF-I influence embryonic development through stimulation of HIF-1α expression.
Methods
Mouse embryos were cultured from the 1-cell to blastocyst stage under 5 % or 20 % O2 in both the absence and presence of IGF-I.
Results
The embryonic development rates to the blastocyst stage were not affected by oxygen tension or IGF-I treatment. HIF-1α protein was localized to the cytoplasm of blastocysts, and its levels were independent of oxygen concentration or IGF-I treatment. Blastocysts cultured under 5 % O2 exhibited significantly higher total cell numbers (83.4 ± 18.1) and lower apoptotic index (3.7 ± 1.5) than those cultured under 20 % O2 (67.4 ± 15.6) (6.9 ± 3.5) (P < 0.05). IGF-I reduced the apoptotic index in both oxygen conditions, but a significant decrease was detected in the 20 % O2 group.
Conclusions
HIF-1α may not be a major mediator that responds to change in oxygen tension within blastocysts, inconsistent with that of somatic cells. Supplementation of culture media with IGF-I has been shown to promote embryo development by an anti-apoptotic effect, instead of increasing HIF-1α protein expression.
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The authors declare no conflict of interest in this study. This research was supported in part by Korea University Education and Research Foundation (YK).
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Capsule Reduced oxygen tension along with IGF-I supplementation can increase the developmental potential of mouse blastocysts, and this may be attributed to the suppression of apoptosis, but not to an influence of HIF-1α expression.
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Yoon, J., Juhn, KM., Ko, JK. et al. Effects of oxygen tension and IGF-I on HIF-1α protein expression in mouse blastocysts. J Assist Reprod Genet 30, 99–105 (2013). https://doi.org/10.1007/s10815-012-9902-z
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DOI: https://doi.org/10.1007/s10815-012-9902-z