Influence of hypophysectomy, castration, fasting, and spermiation on SBP concentration in male rainbow trout (Oncorhynchus mykiss)

Foucher, Jean-Luc; Bail, P-Y. Le; Gac, Florence Le

doi:10.1016/0016-6480(92)90177-l

Cited by 25 publications

(11 citation statements)

References 36 publications

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“…In this species, the regulation of SBP production and the site of its production remain unclear. However, castration does not influence SBP levels in blood plasma while hypophysectomy decreases SBP in blood and liver cytosol but not in testis cytosol [24]. Moreover, a fast decrease of SBP during the spawning period was not found to be linked with an increase of androgen levels, but concomitant to an increase of GH circulating levels and reduced food intake.…”

Section: Introductionmentioning

confidence: 73%

“…Salmonid SBP preferentially binds T with a high affinity (Ka T=2.5nM) and rapid kinetics of association and dissociation, but can bind other steroids with the following order of affinity: T > E2 > P>>col [23,24]. In this species, the regulation of SBP production and the site of its production remain unclear.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a fast decrease of SBP during the spawning period was not found to be linked with an increase of androgen levels, but concomitant to an increase of GH circulating levels and reduced food intake. SBP decrease and GH elevation were attributed to a decreased hepatic function including a decrease of IGF production [24] and of GH receptors (Yao et al unpublished data). However, treatment of trout with a dose of GH, which affected fish growth and circulating IGF levels, had no inhibitory effect on SBP [24].…”

Section: Introductionmentioning

confidence: 99%

“…SBP decrease and GH elevation were attributed to a decreased hepatic function including a decrease of IGF production [24] and of GH receptors (Yao et al unpublished data). However, treatment of trout with a dose of GH, which affected fish growth and circulating IGF levels, had no inhibitory effect on SBP [24].…”

Section: Introductionmentioning

confidence: 99%

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In vivo and in vitro studies on sex steroid binding protein (SBP) regulation in rainbow trout (oncorhynchus mykiss): Influence of sex steroid hormones and of factors linked to growth and metabolism

Foucher

Niu

Mourot

et al. 1991

The Journal of Steroid Biochemistry and Molecular Biology

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Summary--The respective roles of sex steroids and hormones related to growth and metabolism, on SBP regulation have been studied in rainbow trout. In vivo, oestradiol (E2) supplementation induces a slow but significant increase of plasma SBP concentration. Testosterone or cortisol injections have no effect. In vitro, the steroid binding protein that accumulates in incubation medium of hepatic cell primary cultures has been characterized and found to be similar to blood SBP. Its production is increased by addition of E2 (maximum: + 300%). This effect develops slowly over several days of culture and is dose dependent; as little as 1-10 nM E2 is effective.Recombinant rainbow trout GH (rtGH)--4).01 to 1 #g/ml--also increases SBP accumulation as compared to control cells and seems to maintain SBP production over culture duration. In preliminary experiments, (1) insulin-like growth factor (IGF) and SBP concentrations were found to change inversely after a 4 days stimulation with increasing concentrations of GH; (2) recombinant human IGF~ (250 ng/ml) tended to be inhibitory when SBP production was expressed per mg of total cellular protein, and a micromolar concentration of bovine insulin was clearly inhibitory.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In vivo and in vitro studies on sex steroid binding protein (SBP) regulation in rainbow trout (oncorhynchus mykiss): Influence of sex steroid hormones and of factors linked to growth and metabolism

Foucher

Niu

Mourot

et al. 1991

The Journal of Steroid Biochemistry and Molecular Biology

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“…In fact, we demonstrated that in trout, in vivo, variations of plasma SBP levels coincided with perturbations of the GH/IGF system (Foucher et al 1992) and that in vitro, recombinant tGH (1-1000 ng/ml) maintained and stimulated SBP production by trout hepatocytes in culture (Foucher et al 1991). Also, GH may exert a selective stimulation of rat liver cytosolic E 2 receptor (Lucier et al 1981;Von Schoultz and Carlstr6m 1989).…”

Section: Other Interactionsmentioning

confidence: 77%

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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Differences in Binding Characteristics of Sex Steroid Binding Protein in Reproductive and Nonreproductive Female Rainbow Trout (Oncorhynchus mykiss), Black Bream (Acanthopagrus butcheri), and Greenback Flounder (Rhombosolea tapirina)

Hobby

Geraghty

Pankhurst

2000

General and Comparative Endocrinology

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Influence of hypophysectomy, castration, fasting, and spermiation on SBP concentration in male rainbow trout (Oncorhynchus mykiss)

Cited by 25 publications

References 36 publications

In vivo and in vitro studies on sex steroid binding protein (SBP) regulation in rainbow trout (oncorhynchus mykiss): Influence of sex steroid hormones and of factors linked to growth and metabolism

In vivo and in vitro studies on sex steroid binding protein (SBP) regulation in rainbow trout (oncorhynchus mykiss): Influence of sex steroid hormones and of factors linked to growth and metabolism

Growth hormone (GH) and reproduction: a review

Differences in Binding Characteristics of Sex Steroid Binding Protein in Reproductive and Nonreproductive Female Rainbow Trout (Oncorhynchus mykiss), Black Bream (Acanthopagrus butcheri), and Greenback Flounder (Rhombosolea tapirina)

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