Gonadotropin Control of Inhibin Secretion and the Relationship to Follicle Type and Number in the hpg Mouse

• Published in: Biology of reproduction 2005-10, Vol.73 (4), p.610-618
• Main Authors: YUAN WANG, NEWTON, Helen, SPALIVIERO, Jenny A, ALLAN, Charles M, MARSHAN, Benjamin, HANDELSMAN, David J, ILLINGWORTH, Peter J
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Cell Count; Chorionic Gonadotropin - pharmacology; Estradiol - metabolism; Female; Follicle Stimulating Hormone - metabolism; Follicle Stimulating Hormone - pharmacology; Fundamental and applied biological sciences. Psychology; Gonadotropins - deficiency; Gonadotropins - metabolism; Gonadotropins - pharmacology; Hormone metabolism and regulation; Hypogonadism - metabolism; Hypogonadism - pathology; Inhibins - secretion; Luteinizing Hormone - metabolism; Luteinizing Hormone - pharmacology; Mammalian female genital system; Mice; Mice, Mutant Strains; Organ Size; Ovarian Follicle - cytology; Ovarian Follicle - physiology; Ovary - growth & development; Ovulation; Progesterone - metabolism; Time Factors; Vertebrates: reproduction
• ISSN: 0006-3363; 1529-7268
• DOI: 10.1095/biolreprod.105.039602

Inhibin is secreted in two distinct heterodimeric forms, A and B, but the mechanism for the differential control of these two forms is unclear. To evaluate the relationship between secretion of inhibin forms and folliculogenesis, the effects of gonadotropins on inhibin concentrations were studied in parallel with stereological enumeration of ovarian follicle types in gonadotropin-deficient hypogonadal ( hpg ) female mice treated with recombinant human FSH (10 IU/day), hCG (1 IU/day), or both for 20 days. Treatment with FSH alone significantly increased blood concentrations of both inhibin A and inhibin B, whereas hCG alone had no effect on either inhibin. The combination of FSH and hCG further increased the concentration of inhibin A but had no effect on the concentration of inhibin B beyond that of FSH. The number of primordial follicles per ovary was significantly reduced in FSH-treated hpg mice, but was not affected by hCG treatment. Antral follicles were absent in the untreated hpg mice, present following treatment with FSH, and were present in only limited numbers following hCG treatment alone. Preovulatory follicles were observed only in the wild-type and combined FSH and hCG treatment groups. These results demonstrate that secretion of both inhibins is associated with the presence of antral follicles. Inhibin A secretion is increased by the presence of preovulatory follicles, whereas the concentration of inhibin B is not affected. The observed effects of gonadotropins on inhibin A and B secretion may be explained by corresponding gonadotropin effects on follicle development. Abstract Secretion of both inhibins is associated with the presence of antral follicles and Inhibin A secretion is increased by the presence of preovulatory follicles while the concentration of inhibin B is not affected