Studies on the production and metabolic clearance rates of cortisol in the European eel. Anguilla anguilla (L.)

Henderson, Ian; Sa'di, M.N.; Hargreaves, G.

doi:10.1016/0022-4731(74)90016-8

Cited by 24 publications

(19 citation statements)

References 30 publications

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“…For O. kisuich interrenal tissue this is still evident after a 18h in vitro preincubation (Young 1988 1974) and Atlantic salmon . For eels, the difference in production rates between FW-and SW-adapted animals was 75% (Leloup-Hatey 1974), and 69% (Henderson et al 1974), whereas we calculated a 160% increase in cortisol secretion when tilapia were adapted to SW.…”

Section: Discussionmentioning

confidence: 99%

“…In this respect, tilapia resembles other species studied in which a higher production rate in SW was not translated into elevated plasma levels. It was concluded that cortisol clearance rates were higher in fully SW-adapted fish than in fully FW-adapted fish (Henderson et al 1974;Leloup-Hatey 1974). Most likely, the distribution space of the hormone is higher in SW than in FW, possibly because an in crease in perfusion of organs such as the gills (Hanssen et al 1993).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, SW adaptation in eels led to a decline in circulating levels of atrial natri uretic peptides (Takei et al 1992). Interestingly, this implies that the interrenal effect of A N P ob served presently, if operative in eels, could contrib ute to the interrenal stimulation that occurs under SW conditions (Henderson et al 1974;LeloupHatey 1974). Clearly, additional work is warranted using multiple fish species comparing the actions of (Katafuchi et al 1994).…”

Section: A C T H and Seawater Adaptationmentioning

confidence: 99%

“…This in particular holds for interrenal function during long-term SW adaptation, which has been studied in a few species only. After several weeks in SW , a marked increase in cortisol production (Henderson et al 1974;Leloup-Hatey 1974; was observed in the eel, A nguilla anguilla, and A t lantic salmon, Salmo salar. Although these data may corroborate the hypoosmoregulatory role of the hormone, circulating cortisol levels in these spe cies were similar in FW and SW specimens.…”

Section: Introductionmentioning

confidence: 98%

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Regulation of interrenal function in freshwater and sea water adapted tilapia (Oreochromis mossambicus)

Balm

Haenen

Bonga

1995

Fish Physiol Biochem

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In teleosts, cortisol is one of the key factors regulating the adaptation to environmental challenges, such as salinity changes. This paper compares interrenal function between fully adapted freshwater (FW) and sea water (SW) specimens of the euryhaline teleost Oreochromis mossambicus (tilapia), combining morphometric and biosynthetic approaches. Interrenal tissue and two tissues producing interrenal secretagogues (ACTH and A N P; atrial natriuretic peptide) were studied. The results demonstrate that sea water adaptation concurs with a sustained stimulation of the interrenal cells, as evidenced by a marked hyperplasia of the cells and the higher initial ex vivo cortisol release in seawater adapted tilapia. This difference was not reflected in ultrastructural differences in the pituitary corticotropes. Plasma ACTH levels were also similar in FW and SW adapted tilapia. Moreover, in vitro data indicate that the A C T H sensitivity of the interrenal cells of both groups was also similar. A second potential interrenal secretagogue (ANP) has recently been implicated in teleost ionic regulation during salinity changes. However, plasma immunoreactive A N P levels and in vitro production of the hormone were also indistinguishable between FW and SW tilapia. A N P pretreatment of tilapia head kid neys in vitro strongly inhibited the response to A C T H , an effect previously undocumented for teleosts.Whereas the sustained stimulation of the interrenal cells under sea water conditions corroborates results obtained with other teleost species, thereby supporting a hypoosmoregulatory role for cortisol, it also is evident that notable species differences exist regarding the regulation of the interrenal gland under these conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: A C T H and Seawater Adaptationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Regulation of interrenal function in freshwater and sea water adapted tilapia (Oreochromis mossambicus)

Balm

Haenen

Bonga

1995

Fish Physiol Biochem

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“…Clearance studies of exogenous, radiolabelled corticosteroids showed that the MCRs of cortisol in eel (Henderson et al 1974;Leloup-Hatey 1974) and salmon (Donaldson and Dye 1970;Redding et al 1984) were higher in seawater-than in freshwater-acclimated fish. These observations are consistent with the increased bind ing of cortisol to gill tissue during seawater adapta tion (Redding et al 1984).…”

Section: Introductionmentioning

confidence: 99%

Stanniocalcin kinetics in freshwater and seawater european eel (Anguilla anguilla)

Hanssen

Mayer-Gostan²,

Flik

et al. 1993

Fish Physiol Biochem

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The kinetics and hypocalcemic potency of stanniocalcin (STC) were examined in freshwater and seawater eels. The secretion rate and the metabolic clearance rate of STC were calculated from the STC disappearance curve after intra-arterial injection of trout STC. Basal plasma STC concentrations in freshwater and seawater eels did not differ but the STC secretion rate and metabolic clearance rate in seawater eel were 7 0 -7 5 % higher than in FW eel. The increased STC distribution space in seawater eels suggests that the STC receptor density was increased. STC had a higher hypocalcemic potency in seawater than in freshwater eels. These observa tions support the hypothesis that seawater fish require more hormonal control over transcellular influx of calcium than freshwater fish.

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Les Hormones dans l’Osmoregulation des Poissons

Lahlou

1980

Environmental Physiology of Fishes

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Studies on the production and metabolic clearance rates of cortisol in the European eel. Anguilla anguilla (L.)

Cited by 24 publications

References 30 publications

Regulation of interrenal function in freshwater and sea water adapted tilapia (Oreochromis mossambicus)

Regulation of interrenal function in freshwater and sea water adapted tilapia (Oreochromis mossambicus)

Stanniocalcin kinetics in freshwater and seawater european eel (Anguilla anguilla)

Les Hormones dans l’Osmoregulation des Poissons

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