Abstract
We examined rat ovarian granulosa cells at different follicular stages and evaluated the apoptosis pattern of the mitochondria-dependent genes during folliculogenesis. After down-regulating ovarian function with gonadotropin-releasing hormone agonist (GnRHa), granulosa cells were collected from the rat ovary at different stages of the following different hormonal treatment paradigms: stage E (after estrogen treatment), EF (after E + follicle-stimulating hormone [FSH] treatment), and EF hCG (after E + FSH + human chorionic gonadotropin treatment). To evaluate the in vitro susceptibility of granulosa cells at different developmental stages to apoptosis, the collected cells were cultured in a serum-free medium with or without E2 for 24 hours. The regulation of apoptosis in the granulosa cells was analyzed using fluorescein-activated cell sorting, quantitative competitive polymerase chain reaction, and western blot methods. The apoptosis rate of the freshly isolated granulosa cells tended to increase according to the hormonal treatment paradigm. In addition, during the hormone treatment, mitochondria-dependent apoptosis genes showed the following changes: although the Bax mRNA level did not change, the Bcl-2 mRNA level decreased si...Continue Reading
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