Publicação: The effect of serum on in vitro maturation, in vitro fertilization and steroidogenesis of bovine oocytes co-cultured with granulosa cells.
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Data
1995-02-01
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Coorientador
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Resumo
The influence of fetal calf serum alone (FCS) or associated with proestrous (FCS+PCS), estrous (FCS+ECS) or metaestrous (FCS+MCS) cow serum added to the culture medium and of the steroids produced by co-cultured granulosa cells were evaluated in terms of the in vitro maturation (IVM) and fertilization (IVF) of bovine oocytes. Supplementation of the medium with FCS+ECS and FCS+MCS resulted in higher proportions of oocytes that reached metaphase II (96.0% and 93.3%, respectively) and in higher proportions of embryos that reached the four- and eight-cell/morula stages (51.9% and 65.6%, respectively), whereas the supplementation with FCS and FCS+PCS resulted in only 79.2% and 67.5%, respectively, of matured oocytes and 26.7% and 34.3%, respectively, of cleaved embryos. These findings show that the best IVM and IVF were obtained at lower concentrations of estradiol produced by co-cultured granulosa cells (supplementation with FCS+ECS: 10.3 ng/ml and FCS+MCS: 2.1 ng/ml), whereas the worst results in IVM and IVF occurred at higher concentrations of estradiol that were obtained with FCS (33.1 ng/ml) and FCS+PCS (19.9 ng/ml) supplementation. These data suggest an inhibitory effect of estradiol on resumption of oocyte meiosis in vitro.
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steroid, animal, biosynthesis, cattle, cell culture, culture medium, estrus, female, fertilization in vitro, fetus blood, granulosa cell, growth, development and aging, oocyte, physiology, prenatal development, Animal, Cattle, Cells, Cultured, Culture Media, Embryo and Fetal Development, Estrus, Female, Fertilization in Vitro, Fetal Blood, Granulosa Cells, Oocytes, Steroids, Support, Non-U.S. Gov't
Idioma
Inglês
Como citar
Brazilian Journal of Medical and Biological Research, v. 28, n. 2, p. 213-217, 1995.
