Effects of oxygen tension and IGF-I on HIF-1α protein expression in mouse blastocysts

Autor: Yong Ko, Jin Ho Lim, Jeong Yoon, Jin Kyung Ko, Kyoung Mi Juhn, Chul Young Lee, San Hyun Yoon
Rok vydání: 2012
Předmět:
Zdroj: Journal of Assisted Reproduction and Genetics. 30:99-105
ISSN: 1573-7330
1058-0468
Popis: 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.Mouse embryos were cultured from the 1-cell to blastocyst stage under 5 % or 20 % O(2) in both the absence and presence of IGF-I.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 % O(2) exhibited significantly higher total cell numbers (83.4 ± 18.1) and lower apoptotic index (3.7 ± 1.5) than those cultured under 20 % O(2) (67.4 ± 15.6) (6.9 ± 3.5) (P0.05). IGF-I reduced the apoptotic index in both oxygen conditions, but a significant decrease was detected in the 20 % O(2) group.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.
Databáze: OpenAIRE
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