Diurnal rhythms of plasma growth hormone, somatostatin, thyroid hormones, cortisol and glucose concentrations in rainbow trout, <i>Oncorhynchus mykiss</i>, during progressive food deprivation

Holloway, Alison C.; Reddy, P. K.; Sheridan, Mark A.; Leatherland, J. F.

doi:10.1080/09291019409360312

Cited by 93 publications

(52 citation statements)

References 24 publications

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“…In the presently reported study, the insignificant depletion observed in plasma T 4 levels with extending the starvation period (8 days starvation) is probably due to reduced T 4 release from the thyroid tissue in juvenile Siberian sturgeon. This adjustment of TH homeostasis during starvation is in broad agreement with previous studies in numerous fish species (Holloway et al 1994, Van der Geyten et al 1998, Leiner et al 2000, De Pedro Deng et al 2004, Raine et al 2005, which has been known as the lowered anabolic capacity of the animal and the mobilization of stored energy reserves. Gaylord et al (2001) expressed that the reason for the low TH (T 3 and T 4 ) concentrations in channel catfish, Ictalurus punctatus (Rafinesque, 1818), during a 3-day starvation period is the diminished sensitivity of the thyroid tissue to thyroid stimulating hormone (TSH).…”

Section: Discussionsupporting

confidence: 79%

The Effect of Short-term Starvation on Some Physiological and Morphological Parameters in Juvenile Siberian Sturgeon, Acipenser Baerii (Actinopterygii: Acipenseriformes: Acipenseridae)

Ashouri¹,

Yavari²,

Bahmani³

et al. 2013

Acta Icth et Piscat

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Section: Discussionsupporting

confidence: 79%

The Effect of Short-term Starvation on Some Physiological and Morphological Parameters in Juvenile Siberian Sturgeon, Acipenser Baerii (Actinopterygii: Acipenseriformes: Acipenseridae)

Ashouri¹,

Yavari²,

Bahmani³

et al. 2013

Acta Icth et Piscat

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“…that some type of glucosensor mechanism is operational in inter-renal cells of rainbow trout, in a similar way to that characterized in pancreatic β-cells, where the glucosensor system is related to insulin release. In other studies carried out in rainbow trout, plasma cortisol levels decreased under conditions known to produce hypoglycaemia such as food deprivation (Pottinger et al, 2003;Polakof et al, 2007a), whereas plasma cortisol levels increased under hyperglycaemic conditions such as post-feeding (Bry, 1982;Holloway et al, 1994) or exercise (Nielsen et al, 1994). A recent study carried out in zebrafish provided direct evidence for a relationship between cortisol levels and glycaemia as it was found that levels of wholebody cortisol were dependent on glucose (Powers et al, 2010).…”

Section: Introductionmentioning

confidence: 88%

ACTH-stimulated cortisol release from head kidney of rainbow trout is modulated by glucose concentration

Conde-Sieira

Álvarez

López‐Patiño

et al. 2012

Journal of Experimental Biology

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SUMMARYTo assess the hypothesis that cortisol release in rainbow trout is modulated by glucose levels, we first evaluated cortisol release [basal and adrenocorticotropic hormone (ACTH)-regulated] by head kidney tissue superfused with medium reflecting hypoglycaemic, normoglycaemic or hyperglycaemic conditions. Next, cortisol release from head kidney fragments in static incubations was assessed in parallel with changes in parameters related to cortisol synthesis (mRNA abundance of StAR, P450scc, 3βHSD and 11βH) and the GK-mediated glucosensing mechanism (levels of glycogen and glucose, activities of GK, GSase and PK, and mRNA levels of GK, GLUT-2, Kir6.x-like and SUR-like). We then evaluated the effects of two inhibitors of glucose transport, cytochalasin B and phlorizin, on cortisol production and glucosensing mechanisms. The ACTH-induced release of cortisol proved to be modulated by glucose concentration such that increased release occurs under high glucose levels, and decreased ACTH-stimulated cortisol release occurs when glucose transport is inhibited by cytochalasin B. The release of cortisol can be associated with increased synthesis as enhanced mRNA abundance of genes related to cortisol synthesis was also noted in high glucose medium. Specific GK immunoreactivity in the cortisol-producing cells (not in chromaffin cells) further substantiates GK-mediated glucosensing in cortisol production. In contrast, no changes compatible with those of glucose levels and cortisol release/synthesis in the presence of ACTH were noted for any other putative glucosensor mechanisms based on LXR, SGLT-1 or Gnat3. These combined results are the first evidence for a mechanism in fish linking the synthesis and release of a non-pancreatic hormone like cortisol with circulating glucose levels. The relationship was evident for the regulated (ACTHdependent) pathway and this suggests that under acute stress conditions glucose is important for the regulation of cortisol synthesis and release.

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“…Mais l'interaction du stress sur la fonction thyroïdienne des poissons apparaît résulter en des réponses différentes selon l'espèce considérée et la nature et durée du stimulus appliqué. Il s'est avéré que certains stress à court terme tendaient à augmenter la T4 du plasma, avec soit une diminution soit une certaine stabilité de la T3 (PAGNOTTA et al, 1994 ;REDDY et al, 1995), tandis que d'autres stress brefs (REDDING et al, 1984) ou à plus long terme (VIJAYAN et LEATHERLAND, 1989 ;WENDELAAR BONGA, 1993 ;HOLLOWAY et al, 1994) semblaient induire une baisse des teneurs plasmatiques enT4 ou T3, voire une réduction globale de l'activité thyroïdienne (HIGGS et al, 1982).…”

Section: Effets De La Capture Sur Les Hormones Thyroïdiennesunclassified

“…Ce résultat s'accorde à la théorie émise par certains auteurs (HIGGS et ai, 1982 ;REDDING et al, 1984 ;HOLLOWAY et al, 1994) d'une inhibition de l'axe hypothalamo-hypophysothyroïdien par les produits de l'axe hypothalamo-hypophyso-interrénalien. Le stress important provoqué par la prise au filet doit avoir conduit à une rapide régulation de l'axe hypothalamo-hypophyso-thyroïdien, moyen probable par lequel les réserves énergétiques utilisables sont court-circuitées des processus de croissance et rendues disponibles pour subvenir aux besoins métaboliques immédiats et à court terme des animaux (FARBRIDGE et LEATHERLAND, 1992, 1993.…”

Section: Effets De La Capture Sur Les Hormones Thyroïdiennesunclassified

Réponses Physiologiques De Sept Espèces De Poissons Lacustres À Un Stress De Capture (Filet Maillant Et Épuisette).

Bau

Ferroni-Claverie

Parent

2001

Bull. Fr. Pêche Piscic.

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Les perturbations physiologiques potentiellement liées à la capture des poissons par filet maillant ou par épuisette ont été estimées chez des brochets, sandres, perches, brèmes, chevesnes, carpes et tanches de la retenue hydroélectrique de Pareloup (Aveyron). Toute capture provoque rapidement une hausse significative des taux de catecholamines (>10 ng.ml -1 ), Cortisol (> 100 ng.ml -1 ) et glucose (> 1 g.h 1 ) et une baisse des taux d'hormones thyroïdiennes (< 20 ng.ml -1 ) du plasma chez les sept espèces. Ces réponses physiologiques au stress de capture apparaissent significativement plus marquées suite à la pêche par filet maillant et ce, notamment, chez les espèces carnassières. D'après ces résultats, l'utilisation de filets maillants s'avère inadéquate pour des recherches à court terme sur la physiologie sanguine de populations naturelles de poissons, soulignant ainsi la nécessité après ce type de pêche d'une mise en place d'infrastructures particulières (e.g., viviers, cages flottantes, etc.) pour la phase ultérieure de récupération physiologique.Mots-clés : poisson, retenue, physiologie, stress de capture. PHYSIOLOGICAL RESPONSES OF SEVEN LACUSTRINE FISH SPECIES TO CAPTURE STRESS (GILL NET AND LANDING NET). ABSTRACTThe potential physiological disturbances experienced by fish as a result of capture with gill nets or landing nets were assessed in pike, pikeperch, perch, bream, chub, carp and tench from the hydroelectric reservoir of Pareloup (Aveyron). Capture of fish quickly resulted in both a significant elevation of plasma catecholamine (> 10 ng.ml" 1 ), Cortisol (> 100 ng.ml -1 ) and glucose (> 1 g.l -1 ) levels and a drop in plasma thyroid hormone levels (< 20 ng.ml -1 ) in all species. These physiological stress responses were found to be highly increased following gill-netting, especially in carnivorous species. Hence, these data suggest that the use of gill nets is rather inadequate for short-term researches on blood physiology of ferai fish populations, then attesting to the necessity of settling up experimental facilities (e.g., fish-ponds, floating coops, etc.) following gill-netting to ensure a complete recovery of fish from capture stress.

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Diurnal rhythms of plasma growth hormone, somatostatin, thyroid hormones, cortisol and glucose concentrations in rainbow trout, Oncorhynchus mykiss, during progressive food deprivation

Cited by 93 publications

References 24 publications

The Effect of Short-term Starvation on Some Physiological and Morphological Parameters in Juvenile Siberian Sturgeon, Acipenser Baerii (Actinopterygii: Acipenseriformes: Acipenseridae)

The Effect of Short-term Starvation on Some Physiological and Morphological Parameters in Juvenile Siberian Sturgeon, Acipenser Baerii (Actinopterygii: Acipenseriformes: Acipenseridae)

ACTH-stimulated cortisol release from head kidney of rainbow trout is modulated by glucose concentration

Réponses Physiologiques De Sept Espèces De Poissons Lacustres À Un Stress De Capture (Filet Maillant Et Épuisette).

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