Brain aminergic systems in salmonids and other teleosts in relation to steroid feedback and gonadotropin release

Saligaut, Christian; Linard, Boris; Breton, Bernard; Anglade, Isabelle; Bailhache, Thierry; Kah, Olivier; Jégo, Patrick

doi:10.1016/s0044-8486(99)00065-4

Cited by 48 publications

(35 citation statements)

References 39 publications

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“…In the last stages of ovarian maturation, just before ovulation, the rapid estradiol level drop is followed by the diminution of dopamine production. Thanks to this phenomenon there is a potentiation of GnRH action and appearance of LH ovulatory surge and ovulation as observed in coho salmon (Fitzpatrick et al, 1986) or rainbow trout (Saligaut et al, 1999).…”

Section: Discussionmentioning

confidence: 82%

“…In the last stages of ovarian maturity, just before ovulation, the drop of dopamine production follows a rapid drop of estradiol levels. Thanks to this phenomenon the potentiation of GnRH action and the appearance of LH ovulatory surge and ovulation may occur (Fitzpatrick et al, 1986;Saligaut et al, 1999). The aim of this study was to provoke the LH ovulatory wave in carp and goldfish by the use of an aromatase inhibitor -fadrozole.…”

mentioning

confidence: 99%

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LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

Mikołajczyk¹,

Sokolowska-Mikolajczyk²,

Chyb³

et al. 2007

CZECH J ANIM SCI

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Fadrozole -a non-steroidal aromatase inhibitor was applied to common carp and goldfish to examine its ability to potentiate the stimulatory action of GnRH analogues on LH secretion in vivo. The goal of the project was to find a substitute for antidopaminergic drugs used with GnRH analogues in fisheries practice to stimulate ovulation in fish bred in captivity. The first trials on goldfish showed a moderate ability of fadrozole to potentiate salmon GnRH analogue stimulation, weaker than that obtained with pimozide (dopamine antagonist). No ovulation in fadrozole-treated fish was observed. Several experiments performed in two consecutive reproductive seasons (different treatment regimes and doses of fadrozole) neither improved nor confirmed the results obtained in the first year. The analysis of 17β-estradiol levels in the blood plasma and in hypothalami showed no changes in the concentration of this steroid in fadrozole-treated fish in comparison with the controls. This shows that fadrozole is not able to replace the antidopaminergic drugs used in fisheries practice and cannot be considered as a potential ovulation inducer in cyprinids.

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Section: Discussionmentioning

confidence: 82%

mentioning

confidence: 99%

LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

Mikołajczyk¹,

Sokolowska-Mikolajczyk²,

Chyb³

et al. 2007

CZECH J ANIM SCI

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“…GtH-I is released over the entire vitellogenesis, whereas GtH-II remains low during vitellogenesis and exhibits a sharp peak before ovulation (Davies et al, 1995). These different patterns of expression and release demonstrate that there is obviously a differential control of GtH-I and GtH-II (Saligaut et al, 1999).…”

Section: Gonadotropin Secretion and Catecholamine Metabolism In Teleostsmentioning

confidence: 97%

“…However, Billard et al (1983) demonstrated in trout that pimozide (a DA antagonist) alone could increase plasma GtH. Some changes of catecholamine metabolism occurred during the reproductive cycle of the rainbow trout: decrease of DA turnover in pituitary and hypothalamus during the periovulatory period, increase of DA contents in pituitary and hypothalamus during the periovulatory period, increase of DA contents in preoptic area as vitellogenesis proceeds (Saligaut et al, 1992;Saligaut et al, 1999). In using the reproductive cycle by the control, the GtH-I release blood levels in immature and vitellogenic trout are much higher than those of GtH-II and can be compared with those found in salmon in the literature (Dickey and Swanson, 1995).…”

Section: Reproductive Cycle and The Control Of Gths Releasementioning

confidence: 99%

“…In vitellogenic trout, ovariectomy significantly increases blood GtH I levels, like coho salmon (Larsen and Swanson, 1997), and E2-supplementation prevents this increase (Saligaut et al, 1988). GtH release depends then in immature and vitellogenic trout, like in salmon, upon a negative oestrogenic feedback (Saligaut et al, 1999).…”

Section: Reproductive Cycle and The Control Of Gths Releasementioning

confidence: 99%

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The mechanism of reproduction and hormonal function in finfish species: A review

Yousefian¹,

Mousavi²

2011

Sci. Res. Essays

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The number of aquatic species currently under domestication efforts is rising rapidly, due to the development of commercial aquaculture. For domestication and the establishment of a sustainable aquaculture industry, the control reproduction processes of fish in captivity, and to acquire high quality seed, is necessary. The fish reproductive cycle is separated in gametogenesis (of growth) and oocyte maturation and spermiation (of maturation). These are controled by the reproductive hormones of the brain, pituitary and gonad. Environmental and endogenous physiological information reach neuroendocrine system that regulates pituitary and gonadal functions. The most commonly reproduction dysfunctions in cultured fish are the unpredictability of final oocyte maturation (FOM) in females, and the lack and less quality of sperm in males. These problems are due to the fact that the fish in captivity does not have the same conditions in the spawning grounds, and as a result, there is a failure of the proper hormonal regulation. Failure of the pituitary to release gonadotropin (GTH-II), one of the hormones involved in the regulation of reproduction, is the result of unsucssesful ovulation. Actually two type of GTH are identified. They are differing from structural and chemical roles. GTH-I also name as FSH, involve in vitellogenesis or spermatogenesis (initial stage of gametogenesis), and GTH-II name as LH are involve in FOM and spermiogenesis and spermiation.The control role and function of the hormone involve in reproduction are described and reviewed in the present paper.

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Localization of tyrosine hydroxylase and its messenger RNA in the brain of rainbow trout by immunocytochemistry and in situ hybridization

Vétillard

Benanni

Saligaut

et al. 2002

J of Comparative Neurology

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This report describes the distribution of tyrosine hydroxylase (TH)-expressing structures in the brain of rainbow trout (Oncorhynchus mykiss). TH neurons have been localized by the use of two complementary techniques, immunocytochemistry and in situ hybridization of TH messenger RNA. Results obtained from in situ hybridization and immunocytochemistry were in agreement. TH cells were observed in many areas of the brain, with a higher density at the level of the olfactory bulbs where TH-positive neurons are abundant in the internal cell layer. In the telencephalon, two populations of TH neurons can be distinguished: one group is located in the area ventralis telencephali pars dorsalis, and the other group is located in the area ventralis telencephali pars ventralis and extends laterally in the area ventralis telencephali pars lateralis. Many labeled neurons are also seen in the preoptic area as well as in the hypothalamus, where several clusters of TH-positive cells are observed. Some of these neurons located in the paraventricular organ grow a short cytoplasmic extension directed to the ventricular wall and are known to be cerebrospinal fluid-contacting cells. The most caudal TH neurons are observed at the level of the locus caeruleus. At the level of the pituitary, TH-positive fibers are observed in the neurohypophysis. The TH-immunoreactive innervation at the level of the pituitary provides a neuroanatomic basis for the effects of dopamine and/or norepinephrine on the release of pituitary hormones in fish.

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Brain aminergic systems in salmonids and other teleosts in relation to steroid feedback and gonadotropin release

Cited by 48 publications

References 39 publications

LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

The mechanism of reproduction and hormonal function in finfish species: A review

Localization of tyrosine hydroxylase and its messenger RNA in the brain of rainbow trout by immunocytochemistry and in situ hybridization

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