Postovulatory steroidogenesis after ovulation induced by LH or FSH in hypophysectomized pro-oestrous hamsters

Taya, Kazuyoshi; Greenwald, Gilbert S.

doi:10.1530/jrf.0.0580079

Cited by 8 publications

(2 citation statements)

References 18 publications

(22 reference statements)

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“…In cattle, peak concentrations of circulating LH increase approximately 8-fold above basal levels and FSH increase about 3-fold above baseline during the normal gonadotropin surge (Haughian et al, 2004). Although it has been assumed that LH is the primary driver for ovulation and the resumption of meiosis (Tsafriri and Dekel, 1994), this hypothesis has been questioned in the past since purified preparations of FSH can also induce both ovulation and oocyte maturation (Greep et al, 1942;Goldman and Mahesh, 1969;Harrington and Elton, 1969;Jones and Nalbandov, 1972;Lipner et al, 1974;Nuti et al, 1974;Tsafriri et al, 1976;Greenwald and Papkoff, 1980;Taya and Greenwald, 1980;Galway et al, 1990). For example, intrafollicular injections of low doses of purified preparations of either LH or FSH induced ovulation of individual follicles in rabbits (Jones and Nalbandov, 1972) and sheep (Murdoch et al, 1981).…”

Section: Lh and Fsh In Ovulation And Oocyte Maturation In Vivomentioning

confidence: 99%

The role of transcription in EGF- and FSH-mediated oocyte maturation in vitro

Farin

Rodriguez

Alexander

et al. 2007

Animal Reproduction Science

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Understanding mechanisms responsible for meiotic resumption in mammalian oocytes is critical for the identification of strategies to enhance developmental competence of in vitro-matured oocytes. Improvement of in vitro oocyte maturation systems is dependent on a better understanding of mechanisms that regulate oocyte maturation both in vivo and in vitro as well as on the identification of methods to manipulate the meiotic progression of oocytes matured in vitro in a physiological manner. The purpose of this review is two-fold: first, to examine the mechanisms that underlie the acquisition of oocyte developmental competence and regulation of oocyte maturation in vivo and in vitro; second, to present data examining the role of transcription in mediating the ability of EGF and FSH to induce oocyte maturation in vitro. Results presented support the conclusions that (1) EGF-induced oocyte maturation does not require nascent gene transcription in both mice and domestic cats; (2) FSH requires gene transcription to induce oocyte maturation in both species; (3) EGF must be present in the maturation medium to optimize the effectiveness of FSH to promote oocyte maturation; (4) the mechanism used by FSH to induce oocyte maturation in vitro appears to predominate over that used by EGF when both EGF and FSH are present in maturation medium used for either murine or feline cumulus oocyte complexes.

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Section: Lh and Fsh In Ovulation And Oocyte Maturation In Vivomentioning

confidence: 99%

The role of transcription in EGF- and FSH-mediated oocyte maturation in vitro

Farin

Rodriguez

Alexander

et al. 2007

Animal Reproduction Science

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“…Although LH has been known as the primary hormone essential for ovulation and luteinization, studies using purified FSH preparations have suggested that FSH is capable of inducing ovulation in rats and hamsters (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). Additionally, studies in hypophysectomized rats using recombinant human FSH (rhFSH) have confirmed that folliculogenesis and ovulation were induced by rhFSH alone (14,15).…”

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confidence: 99%

Highly expressed recombinant human follicle-stimulating hormone from Chinese hamster ovary cells grown in serum-free medium and its effect on induction of folliculogenesis and ovulation

Kim

Seok

Baek

et al. 2010

Fertility and Sterility

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Ovulations in Rat Ovaries Perfused in Vitro with Follicle-stimulating Hormone1

Shaykh¹,

LeMaire²,

Papkoff³

et al. 1985

Biology of Reproduction

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Using the model of the isolated perfused rat ovary, we have found that highly purified ovine follicle-stimulating hormone (FSH) preparations cause ovulation and that this effect is not due to luteinizing hormone (LH) contamination. Ovine FSH-13 at a concentration of 1.5 mU/ml induced ovulations in all perfused ovaries (8.8 +/- 2.3 ovulations/ovary), as did a more purified preparation, ovine FSH-211B, at concentrations of 0.5 mU/ml (15.0 +/- 6.4 ovulations/ovary) and 5 mU/ml (11.3 +/- 2.6 ovulations/ovary). This ovulation-inducing effect of FSH is accompanied by a marked stimulation of estradiol levels in the perfusion medium without stimulation of progesterone levels. Furthermore, a purified rat FSH preparation (15 mU/ml) also induced ovulation in all ovaries (13.8 +/- 2.2 ovulations/ovary) as well as a stimulation of both estradiol and progesterone in the medium. These data clearly confirm the direct ovulatory effect of FSH on the ovary.

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Postovulatory steroidogenesis after ovulation induced by LH or FSH in hypophysectomized pro-oestrous hamsters

Cited by 8 publications

References 18 publications

The role of transcription in EGF- and FSH-mediated oocyte maturation in vitro

The role of transcription in EGF- and FSH-mediated oocyte maturation in vitro

Highly expressed recombinant human follicle-stimulating hormone from Chinese hamster ovary cells grown in serum-free medium and its effect on induction of folliculogenesis and ovulation

Ovulations in Rat Ovaries Perfused in Vitro with Follicle-stimulating Hormone1

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