The ovarian insulin-like growth factors, a local amplification mechanism for steroidogenesis and hormone action

Hammond, James M.; Mondschein, Judith S.; Samaras, Susan; Canning, Sandra F.

doi:10.1016/0960-0760(91)90209-n

Cited by 71 publications

(37 citation statements)

References 34 publications

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“…IGF-I has been shown to enhance FSH-stimulated steroid production in murine (19) and porcine (20) granulosa cells, and IGFBP have also been shown to affect the ability of IGF-I to modulate FSH actions on granulosa cells and follicular differentia tion (19,20). Therefore, ST and IGF-I represent potential signals through which energy bal ance may alter ovarian function.…”

Section: Introductionmentioning

confidence: 99%

Effect of feed restriction on serum somatotropin, insulin-like growth factor-I-(IGF-I) and IGF binding proteins in cyclic heifers actively immunized against growth hormone releasing factor

Armstrong

Cohick

Harvey

et al. 1993

Domestic Animal Endocrinology

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Section: Introductionmentioning

confidence: 99%

Effect of feed restriction on serum somatotropin, insulin-like growth factor-I-(IGF-I) and IGF binding proteins in cyclic heifers actively immunized against growth hormone releasing factor

Armstrong

Cohick

Harvey

et al. 1993

Domestic Animal Endocrinology

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“…Further, concentrations of progesterone, IGF-1, and prostaglandin F2-α (PGF2-α) in follicular fluid were greater in vitamin-A-treated than in control gilts. Effects of vitamin A on follicle maturation were suggested to be through an IGF-1 stimulatory mechanism, since IGF-1 produced by granulosa cells plays a key role in the resumption of oocyte meiosis (Hammond et al, 1991) and increases both proliferation and progesterone synthesis and secretion by granulosa cells (Giudice, 1992).…”

Section: Vitamin A/retinolmentioning

confidence: 99%

Within-litter variation in birth weight: impact of nutritional status in the sow

Yuan

Zhu

Shi

et al. 2015

J. Zhejiang Univ. Sci. B

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Accompanying the beneficial improvement in litter size from genetic selection for high-prolificacy sows, within-litter variation in birth weight has increased with detrimental effects on post-natal growth and survival due to an increase in the proportion of piglets with low birth-weight. Causes of within-litter variation in birth weight include breed characteristics that affect uterine space, ovulation rate, degree of maturation of oocytes, duration of time required for ovulation, interval between ovulation and fertilization, uterine capacity for implantation and placentation, size and efficiency of placental transport of nutrients, communication between conceptus/fetus and maternal systems, as well as nutritional status and environmental influences during gestation. Because these factors contribute to within-litter variation in birth weight, nutritional status of the sow to improve fetal-placental development must focus on the following three important stages in the reproductive cycle: pre-mating or weaning to estrus, early gestation and late gestation. The goal is to increase the homogeneity of development of oocytes and conceptuses, decrease variations in conceptus development during implantation and placentation, and improve birth weights of newborn piglets. Though some progress has been made in nutritional regulation of within-litter variation in the birth weight of piglets, additional studies, with a focus on and insights into molecular mechanisms of reproductive physiology from the aspects of maternal growth and offspring development, as well as their regulation by nutrients provided to the sow, are urgently needed.

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“…Furthermore, IGF-I, IGF-Ireceptors and IGFBP appear to be strongly regulated by FSH (but also by LH and E 2 ) in granulosa cells (Hsu and Hammond 1987;Hernandez et al 1991), by FSH in Sertoli cells and by LH in Leydig cells (Avallet et al 1991), or by locally (intragonadal) produced factors. For these reasons, this growth factor is generally considered to amplify gonadotropin hormone action and/or to mediate the influence of FSH and LH on the gonads while potential GH effects are often minimized Hammond et al 1991). Interestingly, a recent report shows that IGF-I mRNA is primarily expressed in testicular interstitial cells other than Leydig cells and that this expression is not hCG/LH dependent (Moore et al 1992).…”

Section: Gh Stimulation Of Igf-imentioning

confidence: 99%

Growth hormone (GH) and reproduction: a review

Gac

Blaise

Fostier

et al. 1993

Fish Physiol Biochem

172

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ResumeLes interactions entre les fonctions de croissance et de reproduction mises en evidence chez de nombreux vert6br6s, sont particulierement aigiies A certaines tapes du cycle vital des poissons. Nous d6crivons les interactions endocrines existant entre les axes somatrope et gonadotrope en insistant sur le role jou6 par l'hormone de croissance (GH). L'analyse compare de ces phenomenes chez les mammiferes, les poissons et les amphibiens permet de sugg6rer que la GH joue un rle sp6cifique dans la physiologie de la puberty, la gametog6nese et la fertility. Nous mettons en evidence l'apport original des tudes effectu6es sur le module poisson dans ce champ d'investigation. AbstractInteraction between growth and reproduction occurs in many vertebrates and is particularly obvious at certain stages of the life cycle in fish. Endocrine interactions between the gonadotropic axis and the somatotropic axis are described, the potential role of GH being emphasised. A comparative analysis of these phenomena in mammals, amphibians and fish, suggests a specific role of GH in the physiology of puberty, gametogenesis and fertility. It also shows the original contribution made by studies on the fish model in this field of investigations.

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The ovarian insulin-like growth factors, a local amplification mechanism for steroidogenesis and hormone action

Cited by 71 publications

References 34 publications

Effect of feed restriction on serum somatotropin, insulin-like growth factor-I-(IGF-I) and IGF binding proteins in cyclic heifers actively immunized against growth hormone releasing factor

Effect of feed restriction on serum somatotropin, insulin-like growth factor-I-(IGF-I) and IGF binding proteins in cyclic heifers actively immunized against growth hormone releasing factor

Within-litter variation in birth weight: impact of nutritional status in the sow

Growth hormone (GH) and reproduction: a review

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