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Estradiol and Its Membrane-Impermeable Conjugate (Estradiol-Bovine Serum Albumin) During In Vitro Maturation of Bovine Oocytes: Effects on Nuclear and Cytoplasmic Maturation, Cytoskeleton, and Embryo Quality

Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 3584 CL Utrecht,The Netherlands

In various cell types, there is increasing evidence for nongenomic steroid effects, i.e., effects that are not mediated via the classical steroid receptors. However, little is known about the involvement of the nongenomic pathway of estradiol (E₂) on mammalian oocyte in vitro maturation (IVM). The aim of this study was to investigate whether the effects of E₂ on bovine oocyte IVM are mediated via a plasma membrane receptor (nongenomic). First, we investigated the expression of estradiol (classical) receptor alpha (ER) and beta (ERß) mRNA in oocytes and cumulus cells (CC). We also studied the effects of different exposure times to E₂ (before and after germinal vesicle breakdown, GVBD) on nuclear maturation. To study the possible involvement of the putative estradiol plasma membrane receptor on the IVM of oocytes, we used E₂ conjugated with bovine serum albumin (E₂-BSA), which cannot cross the plasma membranes. Our results demonstrate that oocytes expressed ERß mRNA, while CC expressed both ER and ERß mRNA. Exposure to E₂ during the first 8 h of culture (before GVBD) induced a block at the metaphase I stage (MI). However, the presence of E₂ after GVBD induced an increase of oocytes with nuclear aberrations. Meiotic spindle organization was severely affected by E₂ during IVM and multipolar spindle was the most frequently observed aberration. Exposure of oocytes to E₂-BSA did not affect nuclear maturation, blastocyst formation rate, nor embryo quality. Our results suggest that the detrimental effects of E₂ on in vitro nuclear maturation of bovine oocyte are not exerted via a plasma membrane receptor.

¹ Correspondence: Anna R. Beker-van Woudenberg, Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CL Utrecht, The Netherlands. FAX: 31 30 2534811;a.beker{at}vet.uu.nl

² Deceased

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