Stimulation of glutathione synthesis of in vitro matured bovine oocytes and its effect on embryo development and freezability

Molecular Reproduction and Development
D G de MatosM Matkovic

Abstract

Glutathione (GSH) has been shown to play an important role in embryo development. In a previous study, we demonstrated that cysteamine supplementation of in vitro maturation (IVM) medium increased the intracellular GSH content in bovine oocytes and improved subsequent embryo development to the blastocyst stage. The present study was carried out to evaluate the effect of inhibition by buthionine sulfoximide (BSO) of GSH synthesis during IVM in the presence of cysteamine, on subsequent embryo development, and the effect of cysteamine during IVM on the survival of blastocysts following freezing. The effect of beta-mercaptoethanol and cysteine added to the maturation medium on GSH levels in bovine oocytes, as well as the effect of these compounds on de novo GSH synthesis by oocytes during in vitro maturation, was also studied. The inhibitory effect of BSO during in vitro maturation on GSH synthesis was also evaluated. Evidence was found confirming that GSH synthesis occurs intracellularly during IVM of oocytes and is stimulated by cysteamine, beta-mercaptoethanol and cysteine. Moreover, the present results suggest that the increase in the rate of embryo development exerted by cysteamine, when present during IVM, was due to its stim...Continue Reading

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Citations

Jun 23, 2009·Journal of Assisted Reproduction and Genetics·S M HosseiniMohammad H Nasr-Esfahani
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