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Endocrinology, Vol 137, 1447-1456, Copyright © 1996 by Endocrine Society

ARTICLES

Hormonal regulation of apoptosis in early antral follicles: follicle- stimulating hormone as a major survival factor

SY Chun, KM Eisenhauer, S Minami, H Billig, E Perlas and AJ Hsueh
Department of Gynecology and Obstetrics, Stanford University School of Medicine, California 94305-5317, USA.

Hormonal regulation of apoptosis has been studied in cultured preovulatory follicles. Because early antral follicles are most vulnerable to undergo atretic degeneration under physiological conditions in vivo, the present studies were designed to investigate the hormonal regulation of apoptosis using in vitro culture of early antral follicles. Rats were implanted with diethylstilbestrol at 24 days of age to stimulate the development of early antral follicles, and ovaries were collected at day 27 of age. Early antral follicles were dissected and cultured (four per vial) for 24 h with or without hormonal treatments. After culture, DNA was extracted from follicles, and the degree of apoptotic DNA fragmentation was determined using 3'- end labeling and gel electrophoresis. In situ analysis of apoptotic DNA fragmentation revealed that granulosa cells in these follicles are the main cell type undergoing apoptosis. Follicles cultured in the absence of hormones showed a 12-fold increase in the level of apoptotic DNA fragmentation which was prevented by treatment with FSH in a dose- dependent manner (60% maximal suppression and apparent ED50 of 30 ng/ml). Similarly, treatment with (Bu)2cAMP also suppressed follicle apoptosis. Treatment with LH or human CG, however, minimally suppressed apoptotic DNA fragmentation (35% maximal suppression). Insulin-like growth factor-I (IGF-I) also suppressed apoptosis by 45%. Moreover, the suppressive effect of FSH on apoptosis was partially reversed by coincubation with IGF-binding protein-3, suggesting a potential mediatory role of endogenous IGF-I. However, recombinant bovine GH had no effect on follicle apoptosis despite its ability to stimulate IGF-I messenger RNA (mRNA) levels. Incubation of follicles with epidermal growth factor (EGF) and basic fibroblast growth factor maximally suppressed follicle apoptosis by only 32% and 42%, respectively. Ligand binding analysis indicated the minimal effectiveness of EGF on apoptosis in early antral follicles, as compared with its potent action in preovulatory follicles reported earlier, may be due to a 3.5 fold increase in EGF receptor concentration in the mature follicles. High doses (150 or 500 ng/ml) of interleukin-1beta also suppressed apoptosis by 48% whereas treatment with an NO generator, sodium nitroprusside, or a cyclic GMP analog suppressed apoptosis as effectively as that of FSH. Furthermore, treatment with activin resulted in a dose-related suppression of follicle apoptosis, reaching a maximal 40% suppression. In contrast, cotreatment of activin with its binding protein, follistatin, abolished this effect. Collectively, these data demonstrated a stage-dependent difference in the hormonal regulation of follicle apoptosis. Although FSH, LH/human CG, GH, IGF-I, EGF, basic fibroblast growth factor, and interleukin-1beta are all effective survival factors for preovulatory follicles, FSH is a major survival factor for early antral follicles, the stage during which a majority of follicle undergo atresia under physiological conditions.


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