Histophysiologie de l'axe hypophyso-corticosurrenalien chez le saumon de l'Atlantique (cycle en eau douce, vie thalassique et reproduction)

Olivereau, Madeleine

doi:10.1016/0016-6480(75)90048-9

Cited by 29 publications

(3 citation statements)

References 46 publications

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“…Upstream migration and spawning may be additional factors equivalent to a gradually and continuously increasing stress. ACTH cells and adrenocortical tissue have been found to be stimulated in spawning Atlantic salmon, Salmo salar (Olivereau 1975). Spent salmon, which are very stressed with a survival time of about two weeks in the present study, show less active SL cells.…”

Section: Spent Salmon (Issaquah Creek November 20)mentioning

confidence: 70%

Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Olivereau

Rand‐Weaver

1994

Fish Physiol Biochem

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Immunocytochemical techniques using an antiserum to cod somatolactin (SL) demonstrated the presence of SL cells in the intermediate lobe of the pituitary in Oncorhynchus tshawytscha. The cells were small in yearling fish. Two groups of maturing fish were studied. In the spring run salmon collected in April and May during the upstream migration, the SL cells appeared stimulated. In September, during spawning, SL cell stimulation was maximal with indices of hypertrophy and degranulation often more marked in females than in males. In the other group, salmon of the fall run collected in the Pacific Ocean in August had well developed gonads, large gonadotropes and abundant SL cells. In spawning salmon (September) the SL cells were stimulated, mainly in females. However, the final stimulation was less intense than in spring run spawning fish. The SL cells were smaller, without evident granule release, but still abundant in spent salmon of the fall run caught at the end of November. Various factors (time spent in rivers before spawning, starvation, decalcification, stress, hypothalamic influences) were considered which might explain differences between spring and fall run salmon. These observations suggest that SL may play a role in the control of gonadal maturation in chinook salmon as it may also do in sockeye and chum salmon previously studied, and that SL cells may be sensitive to the ambient salinity.

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Section: Spent Salmon (Issaquah Creek November 20)mentioning

confidence: 70%

Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Olivereau

Rand‐Weaver

1994

Fish Physiol Biochem

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“…Injection experiments have demonstrated that cortisol facilitates adaptation of eels to sea water (Mayer et al 1967;Epstein et al 1971). More recently, Olivereau (1975) reported that the activity of corticotrophicinterrenal axis in Atlantic salmon was stimulated during smoltification before catadromous migration.…”

Section: Discussionmentioning

confidence: 97%

Influence of salinity on ultrastructure of the secretory cells of the adenohypophyseal pars distalis in yearling coho salmon (Oncorhynchus kisutch)

Nagahama¹,

Wc²,

Ws³

1977

Can. J. Zool.

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NAGAHAMA, Y., W. C. CLARKE, and W. S. HOAR. 1977. Influence of salinity on ultrastructure of the secretory cells of the adenohypophyseal pars distalis in yearling coho salmon (Oncorhynchus kisutch). Can. J. Zool. 55: 183-198. Six different types of secretory cells were identified by light and electron microscopy in the adenohypophyseal pars distalis of yearling coho salmon acclimated to fresh or salt water. Prolactin cells are markedly more active in the freshwater than the seawater fish; these cells exhibit definite functional activity 3 days after transfer from salt to fresh water, indicating an osmoregulatory role of prolactin in the freshwater environment. Plasma sodium showed a significant decline 6h after transfer from sea water to fresh water and, even after I week, remained lower than in the fully acclimated freshwater fish. Corticotropic (ACTH) cells did not appear cytologically different in freshwater and seawater fish. GH cells, the most prominent cells in the proximal pars distalis, appear more numerous and more granulated in the seawater fish, suggesting an osmoregulatory involvement in young coho salmon. Putative thyrotropic (TSH) and putative gonadotropic cells (GTH) can be distinguished by differences in granulation; only one type of GTH cell is evident with ultrastructural features that differ from those of sexually mature salmon. Stellate, non-granulated ceUs occur in all regions of the adenohypophysis but more frequently in the prolactin follicles; they are much more prominent in the seawater than freshwater fish. NAGAHAMA, Y., W. C. CLARKE et W. S. HOAR. 1977. Influence of salinity on ultrastructure of the secretory cells of the adenohypophyseal pars distalis in yearling coho salmon (Oncorhynchus kisutch). Can. J. Zool. 55: 183-198. L'examen aux microscopes photonique et electronique de la pars distalis adenohypophysaire de saumons argent& d'un an acclimatts a I'eau douce ou B I'eau salee revele I'existance de six types distincts de cellules secretrices. Les cellules a prolactine sont beaucoup plus actives chez les saumons acclimates a I'eau douce; ces cellules manifestent une activite fonctionnelle bien definie 3 jours apres le transfer des poissons d'eau salee en eau douce, mettant ainsi en lumiire le r61e osmoregulateur de la prolactine en eau douce. Six heures aprks le passage d'eau salee en eau douce, on enregistre une diminution marquee du sodium plasmatique; m2me apres une semaine, ce taux reste plus bas que chez les poissons complttement acclimates al'eau douce. Les cellules a ACTH ne se distinguent pas cytologiquement chez les deux groupes de poissons. Les cellules BGH, les plus grosses de laportion proximale de la pars distalis, semblent plus nombreuses et plus granuleuses chez les poissons d'eau salee, ce qui peut indiquer qu'elles ont un r6le osmorkgulateur chez le ieune saumon amente. Les cellules a TSH et les cellules B GTH se distinguent par leurs granulations; un seil type de cellules B GTH comporte des ultrastructures distinctes de celles au'on trouve chez les saumons B maturi...

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“…The cells of interrenal tissue undergo hypertrophy during smoltification (for review: (Specker, 1982). Pituitary corticotropic cells are also activated during smoltification in Atlantic salmon (Olivereau, 1975). Plasma cortisol levels are low in winter, increase during spring at the time of smoltification and decline from July to September Simpson, 1981, 1986;Specker and Schreck, 1982;Barton et al, 1985;Virtanen and Soivio, 1985;Young et al, 1989;Nagae et al, 1994;Sundell et al, 2003).…”

Section: Involvement Of Corticosteroidsmentioning

confidence: 99%

Interdependence of Thyroid and Corticosteroid Signaling in Vertebrate Developmental Transitions

2021

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Post-embryonic acute developmental processes mainly allow the transition from one life stage in a specific ecological niche to the next life stage in a different ecological niche. Metamorphosis, an emblematic type of these post-embryonic developmental processes, has occurred repeatedly and independently in various phylogenetic groups throughout metazoan evolution, such as in cnidarian, insects, molluscs, tunicates, or vertebrates. This review will focus on metamorphoses and developmental transitions in vertebrates, including typical larval metamorphosis in anuran amphibians, larval and secondary metamorphoses in teleost fishes, egg hatching in sauropsids and birth in mammals. Two neuroendocrine axes, the hypothalamic-pituitary-thyroid and the hypothalamic-pituitary-adrenal/interrenal axes, are central players in the regulation of these life transitions. The review will address the molecular and functional evolution of these axes and their interactions. Mechanisms of integration of internal and environmental cues, and activation of these neuroendocrine axes represent key questions in an “eco-evo-devo” perspective of metamorphosis. The roles played by developmental transitions in the innovation, adaptation, and plasticity of life cycles throughout vertebrates will be discussed. In the current context of global climate change and habitat destruction, the review will also address the impact of environmental factors, such as global warming and endocrine disruptors on hypothalamic-pituitary-thyroid and hypothalamic-pituitary-adrenal/interrenal axes, and regulation of developmental transitions.

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Histophysiologie de l'axe hypophyso-corticosurrenalien chez le saumon de l'Atlantique (cycle en eau douce, vie thalassique et reproduction)

Cited by 29 publications

References 46 publications

Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Immunoreactive somatolactin cells in the pituitary of young, migrating, spawning and spent chinook salmon, Oncorhynchus tshawytscha

Influence of salinity on ultrastructure of the secretory cells of the adenohypophyseal pars distalis in yearling coho salmon (Oncorhynchus kisutch)

Interdependence of Thyroid and Corticosteroid Signaling in Vertebrate Developmental Transitions

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