Seasonal morphological and biochemical changes of Dahlgren cells implies a potential role of the caudal neurosecretory system (CNSS) in the reproduction cycle of teleostean fish

Cui, Heng; Mu, Rui

doi:10.1007/s10695-007-9143-8

Cited by 8 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The number of Dahlgren cell were altered across seasons (Chen and Mu, 2008). However, until now, it was not known whether alterations in temperature would affect the number of Dahlgren cells and their associated secretions.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the CNSS is proposed to play a role in many aspects of adaptive physiology, including osmoregulation, reproduction, nutrition and stress-related responses (Winter et al, 2000;Lu et al, 2004Lu et al, , 2006. Previous studies have found that the CNSS might be functionally reprogramed to cope with changes in physiological challenge during seasonal alternation (Lu et al, 2007;Chen and Mu, 2008). As temperature is arguably the most critical seasonal factor, the role that the CNSS plays in thermal stress and adaptation should be resolved (Mccrohan and Bernier, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Responses of the Caudal Neurosecretory System (CNSS) Under Thermal Stress in Olive Flounder (Paralichthys olivaceus)

Yuan

Long

et al. 2020

Front. Physiol.

View full text Add to dashboard Cite

Temperature is a critical environmental factor that affect most biological and physiological processes in fish. The caudal neurosecretory system (CNSS) is unique to fish and is proved to maintain homeostasis during seasonal alterations. However, the dynamic expression and secretion pattern of its major hormones, corticotrophinreleasing hormone (CRH), urotensin I (UI), and urotensin II (UII), and their response to thermal stress has not been studied. CRH, UII and cortisol in plasma, gene expression levels of CRH, UI, and UII in the CNSS of olive flounder (Paralichthys olivaceus) were therefore characterized. UI-and UII-positive Dahlgren cells, as well as cell proliferation in the CNSS, were also quantified. The results showed that plasma cortisol and CRH were increased in both low temperature (LT) and high temperature (HT) groups. However, there was no difference in plasma UI and UII during thermal stress. In CNSS, CRH, UI, and UII mRNA levels were all significantly elevated in response to acute hypothermal stress and recovered back to the control (normal) level after 8 days of adaptation. During hyperthermal challenge, gene expression of CRH and UI only significantly increased after 8-days of transfer but no change in UII was observed. We also demonstrated an increasing percent of UI-positive Dahlgren cells in the CNSS of 8-days hyperthermal stressed fish. However, no BrdU-labeled Dahlgren cells were found among the three treatment groups. Collectively, our results demonstrate that the CNSS is subjected to dynamic responses under thermal stress and expands upon the role of the CNSS in thermoregulation. The dynamic responses of hormone levels and the gene expression of CRH, UI and UII in CNSS are all involved in the process of hyper-or hypo-thermal stress and adaptation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Responses of the Caudal Neurosecretory System (CNSS) Under Thermal Stress in Olive Flounder (Paralichthys olivaceus)

Yuan

Long

et al. 2020

Front. Physiol.

View full text Add to dashboard Cite

show abstract

“…Ces études réalisées chez plusieurs espèces ont mis en évidence certaines modifications de l'activité du SNSC en lien avec des transformations saisonnières qui touchent l'appareil reproducteur. Ainsi, chez le cyprin doré C. auratus, les cellules de Dahlgren montrent leur taille maximale pendant toute la phase de préparation du frai (Chen & Mu, 2008), tandis que chez le flet P. flesus, la période de frai est concomitante d'une expression minimale des gènes des urotensines (Lu, et al, 2007). Rien toutefois ne dit que ces changements soient réellement liés aux fonctions de reproduction dans la mesure où de nombreux autres processus physiologiques sont contrôlés de façon saisonnière, comme l'osmorégulation et le métabolisme.…”

Section: Participation Du Snsc à D'autres Fonctionsunclassified

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

Tostivint¹,

Girardot²,

Parmentier

et al. 2022

Biologie Aujourd’hui

View full text Add to dashboard Cite

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.

show abstract

“…The CNSS is instrumental in various adaptive physiological processes, including osmoregulation, reproduction, nutrition, and stress responses (Lu et al, 2004(Lu et al, , 2006. Previous study suggested that the CNSS could undergo functional reprogramming to accommodate physiological demands during seasonal fluctuations (Chen and Mu, 2008). Additionally, the CNSS secretes urotensin, a peptide crucial for regulating reproduction, osmoregulation, and cardiovascular functions via the circulatory system (Berlind, 1972;Audet and Chevalier, 1981;Owada et al, 1985;Cioni et al, 1998;McCrohan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

The distinctive morphology of caudal neurosecretory system and its impact on Pampus argenteus throughout the breeding season

Guo,

Zhang,

Song

et al. 2024

Front. Mar. Sci.

View full text Add to dashboard Cite

The caudal neurosecretory system (CNSS) of teleost is intricately linked to reproduction. This study sought to explore the association between the CNSS and the reproductive cycle of Pampus argenteus. Utilizing microscopy and transmission electron microscopy, we observed the morphological alterations within the CNSS. Furthermore, we quantified the levels of urotensin-I (U-I), urotensin-II (U-II), cortisol, and corticotropin-releasing hormone (CRH) throughout the reproductive process. Findings revealed that Dahlgren cells, distributed along the spinal cord adjacent to the terminal 6 vertebrae of the silver pomfret’s tail, were primarily concentrated within the final 3 vertebrae. The neurohypophysis was characterized by an elongated oval form when viewed laterally and an almost spherical configuration in ventral perspective. Post-breeding season, the average diameters of Type I and Type II Dahlgren cells decreased by 21.8% and 15.44%, respectively (P < 0.05), accompanied by a reduction in neurosecretory granules to merely 60% of their initial pre-reproductive state (P < 0.05). Variations in the serum and gonadal concentrations of U-I, U-II, cortisol, and CRH indicated a significant correlation with gonadal maturation. In summary, the CNSS plays a crucial role in gonadal development, directly or indirectly influencing and modulating the reproductive activities of P. argenteus.

show abstract

Seasonal morphological and biochemical changes of Dahlgren cells implies a potential role of the caudal neurosecretory system (CNSS) in the reproduction cycle of teleostean fish

Cited by 8 publications

References 34 publications

Dynamic Responses of the Caudal Neurosecretory System (CNSS) Under Thermal Stress in Olive Flounder (Paralichthys olivaceus)

Dynamic Responses of the Caudal Neurosecretory System (CNSS) Under Thermal Stress in Olive Flounder (Paralichthys olivaceus)

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

The distinctive morphology of caudal neurosecretory system and its impact on Pampus argenteus throughout the breeding season

Contact Info

Product

Resources

About