Effect of Egg Deprivation on Sex Steroids, Gonadotropin, Prolactin, and Growth Hormone Profiles during the Reproductive Cycle of the Mouthbrooding Cichlid Fish Oreochromis niloticus

Tacon, Philippe; Baroiller, Jean‐François; Bail, P.‐Y. Le; Prunet, Patrick; Jalabert, Bernard

doi:10.1006/gcen.1999.7388

Cited by 69 publications

(45 citation statements)

References 45 publications

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“…These findings are in agreement with the in vitro stimulatory effects of tiPRL on testis testosterone production previously described in Oreochromis mossambicus (Rubin & Specker 1992) and underline a direct regulation of both male and female gonadal functions by PRL in tilapia. Moreover, recent studies of plasma PRL levels during the course of a female reproductive cycle by Tacon et al (2000) indicated that PRL might be involved in the regulation of vitellogenesis and a possible implication of one of the two PRL isoforms in the control  3. In situ hybridization of the prolactin receptor (PRL-R) in the tissues collected from fresh water-reared tilapia.…”

Section: Discussionmentioning

confidence: 99%

“…Identification of the PRL target cells in both ovary and testis, as well as the time course quantification of tiPRL-R expression during maturation, might yield information concerning PRL functions in fish reproduction, especially during the female sexual cycle, for which the reproductive effects of PRL are unclear (Weber & Grau 1995, Tacon et al 2000.…”

Section: Discussionmentioning

confidence: 99%

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Expression of the prolactin receptor (tiPRL-R) gene in tilapia Oreochromis niloticus: tissue distribution and cellular localization in osmoregulatory organs

Sandra¹,

Rouzic²,

Cauty³

et al. 2000

Journal of Molecular Endocrinology

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The expression of the prolactin receptor (PRL-R) gene has been investigated in various tissues of tilapia (Oreochromis niloticus) reared in fresh or brackish water. Using a cDNA probe spanning the extracellular domain of the tilapia PRL-R and Northern blot analysis, the presence of tilapia PRL-R mRNA has been confirmed in the osmoregulatory organs and has been detected in other tissues, including the skin, the brain, the reproductive organs, and the two major hematopoietic organs (spleen and head kidney), as well as circulating lymphocytes. These findings suggest a conservation of the physiological processes regulated by prolactin throughout the vertebrates, including immunity and central nervous activity. A non-radioactive in situ hybridization procedure has allowed us to detect the expression of the tilapia PRL-R in the branchial chloride cells and the intestinal mucosal layer of fresh water animals, confirming the direct control exerted by prolactin on the water and ionic exchanges in tilapia. In all the tissues examined one unique PRL-R transcript has been detected with a similar size (3·2 kb) whatever the salinity conditions. Thus, the transcriptional expression of the tilapia PRL-R strongly differs from the complex RNA pattern reported for the higher vertebrates PRL-R and provides an additional argument for the existence of a single PRL-R for both prolactin isoforms in this fish species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Expression of the prolactin receptor (tiPRL-R) gene in tilapia Oreochromis niloticus: tissue distribution and cellular localization in osmoregulatory organs

Sandra¹,

Rouzic²,

Cauty³

et al. 2000

Journal of Molecular Endocrinology

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“…She will keep the embryos continuously within the buccopharyngeal cavity during a first period of 15 days (at ~27 °C) of embryo development, thus ceasing to feed, then liberating the young fry temporarily for increasing periods, up to definitive release at the end of larval development [47]. In that species exhibiting repeated successive reproductive cycles of about one month, mouth brooding behaviour is closely related to the rhythm of ovarian development [48] and endocrine profiles of growth hormone, prolactin (PRL) and sex steroids [49]. In tilapias belonging to the genus Sarotherodon, mouth brooding is normally performed by the male, but the female can occasionally participate [50].…”

Section: Reproductive and Parental Behaviour -Spawning And Fertilisationmentioning

confidence: 99%

Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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-Compared to mammals, teleost reproduction presents many original features. Reproductive strategies of species are diversified into numerous adaptations to a large variety of aquatic environments. This diversity may concern sexuality, spawning and parental behaviour, sensitivity to environmental factors, and specific features of gametogenesis such as the duration of vitellogenesis, and egg morphology. Sexuality presents a variety of natural modalities, from gonochorism to hermaphrodism. The absence of definitive arrest of body growth in the adult of most species gives a particular interest to the practical control of growth-reproduction interactions. Vitellogenesis, which represents an important metabolic effort for the maternal organism, involves the synthesis of vitellogenin, a specific glycolipo-phosphoprotein produced in the liver under estradiol stimulation, and its incorporation into oocytes by a receptor mediated process. Both estradiol synthesis in follicle cells and vtg uptake by vitellogenic follicles appear to be mainly controlled by FSH. Oocyte maturation is directly triggered by a progestin, or MIS (maturation inducing steroid) synthesised in follicle cells mainly under LH control, and acting through the non-genomic activation of a membrane receptor. Practical applications of some of these particularities result mainly from the external character of the fertilisation process and of embryonic development, which allows manipulating respectively egg chromosome stocks and sex differentiation. Moreover, the sensitivity of sex differentiation to exogenous factors favours the development of practical methods to control the sex of farmed populations. Finally, the sensitivity of reproductive mechanisms to xenobiotics has led to various kinds of bioassays for putative pollutants.reproductive strategies / sexuality / spawning / vitellogenesis / oocyte maturation / fertilisation

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“…Thirdly, PRL levels change during breeding cycles: for example, Nile tilapia plasma PRL levels are highest in females after spawning, during vitellogenesis [110]. Similarly, PRL serum levels in Mozambique tilapia also change across the reproductive cycle, although this effect was found to be inconsistent between experimental treatments [116].…”

Section: Reproductive Development and Cyclingmentioning

confidence: 99%

“…The fact that the expression of tiPRL177 increased in fasting fish raises the possibility that the hormone may play an indirect role in metabolic regulation during reproduction, when feeding activity of mouth brooding species is reduced [116]. In Nile tilapia, increased plasma tiPRL177 variance was found in brooding females [110], although the functional implications of this increased variance remain unknown. Summers and Zhu [108] found evidence of positive selection along the tiPRL177 lineage in Oreochromis cichlids (including tilapia), and have speculated that selection may have contributed to the evolution of complex parental behaviour exhibited in this genus.…”

Section: Mouth Broodingmentioning

confidence: 99%

The role of prolactin in fish reproduction

Whittington¹,

Wilson²

2013

General and Comparative Endocrinology

103

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Abstract:Prolactin (PRL) has one of the broadest ranges of functions of any vertebrate hormone, and plays a critical role in regulating aspects of reproduction in widely divergent lineages. However, while PRL structure, mode of action and functions have been well-characterised in mammals, studies of other vertebrate lineages remain incomplete. As the most diverse group of vertebrates, fish offer a particularly valuable model system for the study of the evolution of reproductive endocrine function. Here, we review the current state of knowledge on the role of prolactin in fish reproduction, which extends to migration, reproductive development and cycling, brood care behaviour, pregnancy, and nutrient provisioning to young. We also highlight significant gaps in knowledge and advocate a specific bidirectional research methodology including both observational and manipulative experiments. Focusing research efforts towards the thorough characterisation of a restricted number of reproductively diverse fish models will help to provide the foundation necessary for a more explicitly evolutionary analysis of PRL function.

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Effect of Egg Deprivation on Sex Steroids, Gonadotropin, Prolactin, and Growth Hormone Profiles during the Reproductive Cycle of the Mouthbrooding Cichlid Fish Oreochromis niloticus

Cited by 69 publications

References 45 publications

Expression of the prolactin receptor (tiPRL-R) gene in tilapia Oreochromis niloticus: tissue distribution and cellular localization in osmoregulatory organs

Expression of the prolactin receptor (tiPRL-R) gene in tilapia Oreochromis niloticus: tissue distribution and cellular localization in osmoregulatory organs

Particularities of reproduction and oogenesis in teleost fish compared to mammals

The role of prolactin in fish reproduction

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