Short-term exposure to hydrogen peroxide during oocyte maturation improves bovine embryo development
2010
Vandaele, L. | Thys, M. | Bijttebier, J. | Van Langendonckt, A. | Donnay, I. | Maes, D. | Meyer, E. | Van Soom, A.
Recent studies have shown that short-term exposure of oocytes to a stressor such as hydrostatic pressure or osmotic stress might induce stress tolerance in embryos. The aim of the present study was to investigate the consequences of short-term hydrogen peroxide (H₂O₂) exposure to bovine in vitro matured cumulus-oocyte complexes (COCs) on subsequent preimplantation embryo development and apoptosis. In the first experiment, mature COCs were incubated in H₂O₂ at concentrations ranging between 0.01 and 100 μmol/l, and subsequently fertilized and cultured. Oocyte incubation with 50-100 μmol/l of H₂O₂ resulted in a significantly higher blastocyst yield (47.3%) in comparison with control medium (31.8%), while apoptotic cell ratio was inversely related with H₂O₂ concentration. In the second experiment, we showed that the stress tolerance after H₂O₂ exposure was not mediated by increased glutathione content in treated oocytes nor by enhanced fertilization or penetration. Further research should concentrate on the potential role of players that have been associated with stress tolerance in somatic cell lines.
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