Coexistence of urotensin I/corticotropin-releasing factor and urotensin II immunoreactivities in cells of the caudal neurosecretory system of a teleost and an elasmobranch fish

Onstott, Donna; Elde, Robert

doi:10.1016/0016-6480(86)90167-x

Cited by 25 publications

(4 citation statements)

References 28 publications

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“…Two major peptides have been isolated from the urophysis, urotensin I (UI) and urotensin II (UII), which exhibit various biological activities in lower and higher vertebrates (Chan & Bern, 1976;Lederis et al, 1985b;Bern, 1990). It has been shown that in teleosts there is a wide range of species variation in the degree of coexistence of UI and UII immunoreactivity within cells of the caudal neurosecretory system (Onstott & Elde, 1986). However, it seems that all the caudal neurosecretory cells synthesize both peptides and that differences in immunoreactivity may result from different states of cellular activity (Larson et al, 1987;Ichikawa et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Morphology and immuno‐histochemistry of the caudal neurosecretory system of a marine euryhaline fish,dicentrarchus labrax, acclimated to low salinity

Cioni

Merich

Pepe

1996

Italian Journal of Zoology

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The morphology and the immunohistochemistry of the caudal neurosecretory system of Dicentrarchus labrax were analysed after the fish acclimatation to fresh water. Two different sized neurosecretory cells have been identified in seawater-acclimated fish and denoted as anterior and posterior cells. The two types of cells share similar patterns and intensities of immunoreactivity with urotensin I and urotensin II antisera. Posterior neurosecretory cells decreased in size in freshwater-acclimated specimens, whereas anterior cells did not show changes. Urophyses of seawater-and freshwateracclimated fish reacted with both antisera. Immunohistochemistry of the urophysis did not provide evidence for a significant difference in the activity of the caudal neurosecretory system between seawater-and freshwater-acclimated fish. However, on a morphological basis it was possible to suggest that the caudal neurosecretory system of the sea bass is involved in the hyperosmoregulation.

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Section: Introductionmentioning

confidence: 99%

Morphology and immuno‐histochemistry of the caudal neurosecretory system of a marine euryhaline fish,dicentrarchus labrax, acclimated to low salinity

Cioni

Merich

Pepe

1996

Italian Journal of Zoology

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“…Chez les tétrapodes, qui sont dépourvus de SNSC (voir plus loin), l'UII est principalement produite par des motoneurones localisés dans la moelle épinière et le tronc cérébral (Coulouarn et al, 1998(Coulouarn et al, , 1999Egginger et al, 2006 ;Dubessy et al, 2008). Des expériences de double marquage, soit par immunohistochimie, soit par hybridation in situ, suggèrent que la proportion de cellules de Dahlgren produisant à la fois l'UI et l'UII est très variable d'une espèce à l'autre : très forte chez la carpe (Ichikawa et al, 1988), faible chez le poisson-zèbre D. rerio (Parmentier et al, 2008) et intermédiaire chez le poisson-crapaud Porichthys notatus (Onstott & Elde, 1986a). La microscopie électronique a révélé chez le poisson-zèbre D. rerio que l'UII est stockée principalement dans les vésicules à coeur dense de grand diamètre, alors que l'UI est accumulée dans des vésicules de plus petit diamètre (Parmentier et al, 2006).…”

Section: Les Sécrétions Urophysairesunclassified

Le système neurosécréteur caudal, l’autre système « neurohypophysaire » des poissons

Tostivint¹,

Girardot²,

Parmentier

et al. 2022

Biologie Aujourd’hui

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Le système neurosécréteur caudal (SNSC) est un complexe neuroendocrinien propre aux poissons. Sur le plan structural, il présente de nombreuses similitudes avec le complexe hypothalamo-neurohypophysaire d’autres vertébrés. Il s’en distingue toutefois par sa position, à l’extrémité caudale de la moelle épinière, et par la nature des hormones qu’il sécrète, les plus importantes étant les urotensines. Le SNSC a été décrit pour la première fois il y a plus de 60 ans, mais son origine embryologique est totalement inconnue et son rôle reste mal compris. Paradoxalement, il n’est presque plus étudié aujourd’hui. Les développements récents en imagerie et en génie génétique pourraient justifier la reprise d’investigations sur le SNSC afin de lever les mystères qui continuent de l’entourer.

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“…Immunohistochemical evidence showed that UI and UII are not fully colocalized in the Dahlgren cells of all species [172,173,174,175]. For instance, immunoreactive cells for both urotensins are fewer than UII-ir cells in goldfish.…”

Section: Nitric Oxide In the Cnssmentioning

confidence: 99%

Nitric Oxide and the Neuroendocrine Control of the Osmotic Stress Response in Teleosts

Cioni

Angiulli

Toni

2019

IJMS

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The involvement of nitric oxide (NO) in the modulation of teleost osmoresponsive circuits is suggested by the facts that NO synthase enzymes are expressed in the neurosecretory systems and may be regulated by osmotic stimuli. The present paper is an overview on the research suggesting a role for NO in the central modulation of hormone release in the hypothalamo-neurohypophysial and the caudal neurosecretory systems of teleosts during the osmotic stress response. Active NOS enzymes are constitutively expressed by the magnocellular and parvocellular hypophysiotropic neurons and the caudal neurosecretory neurons of teleosts. Moreover, their expression may be regulated in response to the osmotic challenge. Available data suggests that the regulatory role of NO appeared early during vertebrate phylogeny and the neuroendocrine modulation by NO is conservative. Nonetheless, NO seems to have opposite effects in fish compared to mammals. Indeed, NO exerts excitatory effects on the electrical activity of the caudal neurosecretory neurons, influencing the amount of peptides released from the urophysis, while it inhibits hormone release from the magnocellular neurons in mammals.

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Coexistence of urotensin I/corticotropin-releasing factor and urotensin II immunoreactivities in cells of the caudal neurosecretory system of a teleost and an elasmobranch fish

Cited by 25 publications

References 28 publications

Morphology and immuno‐histochemistry of the caudal neurosecretory system of a marine euryhaline fish,dicentrarchus labrax, acclimated to low salinity

Morphology and immuno‐histochemistry of the caudal neurosecretory system of a marine euryhaline fish,dicentrarchus labrax, acclimated to low salinity

Le système neurosécréteur caudal, l’autre système « neurohypophysaire » des poissons

Nitric Oxide and the Neuroendocrine Control of the Osmotic Stress Response in Teleosts

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