Isolation of Inhibin α-Subunit Precursor Proteins from Bovine Follicular Fluid*

Robertson, D. M.; Giacometti, M.; Foulds, Lynda M.; Lahnstein, J.; Goss, Neil H.; Hearn, Milton T. W.; Kretser, David Morritz de

doi:10.1210/endo-125-4-2141

Cited by 235 publications

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“…Inhibin is mainly produced by granulosa cells and is detectable in follicular fluids with multiple molecular forms in female mammals [3,[22][23][24][25]. After injections of inhibin antiserum or NGS, Ig G enters the follicular fluid of antral follicles in the ovary, and this makes it possible for inhibin antibodies, one kind of Ig G, to combine with inhibins in follicular fluid and have local functions in follicular development.…”

Section: Discussionmentioning

confidence: 99%

Ovarian Localization of Immunoglobulin G and Inhibin .ALPHA.-Subunit in Guinea Pigs after Passive Immunization against the Inhibin .ALPHA.-Subunit.

Shi

Mochida

Сузукі

et al. 2000

Journal of Reproduction and Development

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Abstract. The experiment was conducted to elucidate ovarian localization of immunoglobulin G (Ig G) and inhibin α-subunit and follicular development in guinea pigs after passive immunization against the inhibin α-subunit. Estrus was synchronized in laboratory guinea pigs by implanting progesterone containing-tubes. After removal of the progesterone implants, the guinea pigs were injected i.v. with 1.0 ml inhibin antiserum or normal goat serum (NGS). The results showed that Ig G mainly entered the follicular fluid of antral follicles, indicating that possibly inhibin antibodies could be a local regulator affecting follicular development in guinea pigs. The results also showed that passive immunization against inhibin increased the number of follicles and plasma concentrations of estradiol before ovulation, but did not change the plasma concentrations of follicle-stimulating hormone (FSH) or the numbers of follicles stained with inhibin antiserum. The present study first reports that the distribution of Ig G after injections of inhibin antiserum and confirms our previous hypothesis that only dominant follicles could be stained for inhibin α-subunit. The results also imply that only one injection of inhibin antiserum could not increase the ovulation rate in guinea pigs.

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Section: Discussionmentioning

confidence: 99%

Ovarian Localization of Immunoglobulin G and Inhibin .ALPHA.-Subunit in Guinea Pigs after Passive Immunization against the Inhibin .ALPHA.-Subunit.

Shi

Mochida

Сузукі

et al. 2000

Journal of Reproduction and Development

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“…The concentrations of inhibin were determined by RIA as previously described (McNatty et al 1992). The antibody to inhibin detects 31 kDa inhibin and the pro-aC subunit (Robertson et al 1989). The intra-and inter-assay coefficients of variations were 9.4% and 13.1% respectively.…”

Section: Determination Of Progesterone and Inhibin Concentrations In mentioning

confidence: 99%

Bone morphogenetic protein 15 and growth differentiation factor 9 co-operate to regulate granulosa cell function

McNatty

Juengel²,

Reader³

et al. 2005

Reproduction

164

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The oocyte-secreted polypeptide growth factors, growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15, also known as GDF9B) have both been shown to be essential for ovarian follicular growth and function. The effects of murine (m) and ovine (o) GDF9 as well as oBMP15, alone or together, on 3 H-thymidine uptake and progesterone and inhibin production by granulosa cells from rats were determined. Murine GDF9 stimulated thymidine incorporation by granulosa cells whereas oGDF9 and oBMP15 alone had no effect. However, oBMP15 given together with mGDF9 or oGDF9 was very potent in stimulating 3 H-thymidine incorporation by granulosa cells with a greater than 3-fold stimulation compared with any growth factor alone. The synergistic effect of oBMP15 and oGDF9 was almost completely blocked by antibodies generated against these growth factors when administered either alone or in combination. While neither GDF9 (murine or ovine) nor oBMP15 were able to modulate FSH-stimulated progesterone production on their own, FSH-stimulated progesterone production by granulosa cells was potently inhibited when BMP15 and GDF9 were administered together. Immunoreactive ainhibin levels increased more than 15-fold from granulosa cells when BMP15 and GDF9 were given together whereas consistent stimulatory effects of either growth factor alone were not observed. The effects of GDF9 and BMP15, when added together, were different than those observed for the growth factors alone. Therefore, we hypothesize that within the ovary, these oocyte-secreted growth factors co-operate to regulate proliferation and gonadotropin-induced differentiation of granulosa cells in mammals.Reproduction (

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Section: Determination Of Progesterone and Inhibin Concentrations In mentioning

confidence: 99%

Bone morphogenetic protein 15 and growth differentiation factor 9 co-operate to regulate granulosa cell function in ruminants

McNatty

Juengel²,

Reader³

et al. 2005

Reproduction

189

136

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The oocyte-secreted polypeptide growth factors, growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15, also known as GDF9B) have both been shown to be essential for ovarian follicular development and ovulation rate. In addition, it is known from both in vivo and in vitro studies that these factors co-operate in some manner. To date, most studies examining the in vitro effects of these growth factors have used the rodent model. However, the evidence suggests that these growth factors have somewhat different roles between rodents and ruminants. Therefore, the objectives of these studies were to examine the effects of GDF9 and BMP15, alone and together, on the functions of ovine and bovine granulosa cells under in vitro conditions. Ovine (o)BMP15 given together with murine (m)GDF9 or oGDF9 was more potent in stimulating 3 H-thymidine incorporation by ovine granulosa cells compared with each growth factor alone. For bovine granulosa cells, there appeared to be little or no co-operativity between oBMP15 and oGDF9 as oBMP15 alone was as potent as any combination of the two growth factors in stimulating 3 H-thymidine uptake. The species of origin of GDF9 affected the progesterone response in ovine granulosa cells with mGDF9 stimulating and oGDF9 inhibiting progesterone production. Ovine BMP15 alone had no effect on progesterone production by ovine granulosa cells and these growth factors did not appear to co-operate. FSH-stimulated progesterone production by bovine granulosa cells was most potently inhibited when oBMP15 and murine or ovine GDF9 were administered together. As was observed for progesterone, the species of origin of GDF9 affected inhibin production by ovine granulosa cells where mGDF9 inhibited while oGDF9 stimulated production. Murine GDF9 also inhibited inhibin production from bovine granulosa cells. For both ovine and bovine granulosa cells, BMP15 alone had no effect on inhibin production and there did not appear to be any co-operation between GDF9 and BMP15. These results indicate that the effects of BMP15 and GDF9 varied with respect to the species of origin of the growth factor. Moreover, the effects of GDF9 and BMP15 together were often co-operative and not always the same as those observed for these growth factors alone.Reproduction (

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Isolation of Inhibin α-Subunit Precursor Proteins from Bovine Follicular Fluid*

Cited by 235 publications

References 0 publications

Ovarian Localization of Immunoglobulin G and Inhibin .ALPHA.-Subunit in Guinea Pigs after Passive Immunization against the Inhibin .ALPHA.-Subunit.

Ovarian Localization of Immunoglobulin G and Inhibin .ALPHA.-Subunit in Guinea Pigs after Passive Immunization against the Inhibin .ALPHA.-Subunit.

Bone morphogenetic protein 15 and growth differentiation factor 9 co-operate to regulate granulosa cell function

Bone morphogenetic protein 15 and growth differentiation factor 9 co-operate to regulate granulosa cell function in ruminants

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