Séparation chromatographique et dosage de l'arginine-vasotocine et de l'isotocine de l'hypophyse et du noyau préoptique chez l'Anguille de Mer du Nord (Anguilla anguilla L.)

Holder, F.C.

doi:10.1007/bf01897962

Cited by 6 publications

(3 citation statements)

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“…Hyodo and Urano (1991) have also examined the effect of altered environmental salinity on the expression of vasotocin precursor genes in the trout using in situ hybridisation techniques. The pro vasotocin hybridisation signals in magnocellular neurones were markedly decreased after transfer of fish from FW to 80% SW. By contrast, in the european eel after long term adaptation to SW, pituitary AVT content was higher than in FW-adapted fish (Holder 1968(Holder , 1970.…”

Section: Introductionmentioning

confidence: 70%

Arginine vasotocin and fish osmoregulation

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Warne

Tierney

et al. 1993

Fish Physiol Biochem

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Pituitary arginine vasotocin (AVT) secretion is sensitive to the osmotic challenge associated with transfer of euryhaline teleosts between sea water (SW) and fresh water (FW). Pituitary AVT content in FW-adapted flounders greatly exceeds that in SW-adapted fish. Plasma AVT concentrations are in the range 10(-12)-10(-11) M (1-100 pg/ml). In euryhaline species, like the eel, flounder and trout, there were no consistent, marked differences in plasma AVT concentrations between FW- and SW-adapted fish. In SW- but not FW-adapted flounders plasma AVT and sodium concentrations are correlated. During the initial period of acclimation from FW to SW eels, show a transitory rise in plasma AVT concentration which is associated with a transitory increase in plasma Angiotensin II. In view of the range of plasma AVT concentration observed in SW- and FW-adapted fish, it is evident that of the described dose-dependent effects of AVT on urine production, only the antidiuretic responses are likely to be of physiological significance. In addition to the presence of a V1-type vascular receptor for AVT, the nephron also possesses a V2-type receptor, coupled to adenylate cyclase. In the gill tissue AVT receptors are also present, but in this tissue receptor occupancy leads to inhibition of cAMP production rather than the stimulation observed in renal tissue. The functional significance of the gill AVT receptor remains to be established.

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Section: Introductionmentioning

confidence: 70%

Arginine vasotocin and fish osmoregulation

Balment

Warne

Tierney

et al. 1993

Fish Physiol Biochem

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“…Seawater eel pituitary glands contain much larger amounts of AVT and isotocin than those of freshwater eels (Holder, 1970) and release of less than 1% of the amount found in seawater eel pituitary glands per 24 h would be sufficient to reduce the GFR and urinary flow of a freshwater eel to the values found in seawater eels. A single injection of a dose of hormone, which produces a maximum antidiuretic response in the freshwater eel, into a seawater eel produces a slight and non-significant increase in the flow of urine.…”

Section: Discussionmentioning

confidence: 97%

“…Holder (1968) showed that the total pituitary content of neurohypophysial hormones of silver eels (which have undergone metamorphosis preparatory to migrating to sea-water) was greater than that of yellow eels. In a series of papers, Holder (1969a, b;1970) showed that the levels of both AVT and isotocin were much higher in the pituitary glands of seawater eels than in those of freshwater eels, although the amounts in the preoptic nuclei did not vary greatly. Furthermore, the amount of AVT in the pituitary glands and preoptic nuclei of North Sea eels was greater than in eels from the more dilute Baltic Sea; this relationship did not hold for isotocin.…”

Section: Introductionmentioning

confidence: 96%

Neurohypophysial Hormonal Control of Kidney Function in the European Eel (Anguilla Anguilla L.) Adapted to Sea-Water or Fresh Water

Babiker¹,

Rankin²

1978

Journal of Endocrinology

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Low doses of arginine-vasotocin (AVT), isotocin and oxytocin (1 pg-1 ng/kg body weight) were antidiuretic in eels adapted to fresh water but not in those adapted to sea-water. High doses (more than 10 ng/kg) were always diuretic. No effects on tubular water reabsorption were observed and the glomerular filtration rate (GFR) was proportional to the maximum reabsorptive rate for glucose (Tm(glucose)) in eels adapted to sea-water. Increases in urinary flow appeared therefore to result from glomerular recruitment. Infusion of AVT or isotocin at low rates reduced the GFR and urinary flow of freshwater eels to the levels found in seawater eels. Vasopressin (lysine or arginine) had no direct effect on kidney function in freshwater eels but blocked both the diuretic and antidiuretic actions of the other hormones. When infused into seawater eels it was diuretic. This effect could have been due to blockade of the actions of endogenous AVT and/or isotocin.

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Arguments biochimiques et histologiques en faveur du transport et de l'accumulation parall�les des hormones et des grains de neuros�cr�tion chez l'anguille hypophysectomis�e

Holder¹

1973

Z.Zellforsch

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Séparation chromatographique et dosage de l'arginine-vasotocine et de l'isotocine de l'hypophyse et du noyau préoptique chez l'Anguille de Mer du Nord (Anguilla anguilla L.)

Cited by 6 publications

References 0 publications

Arginine vasotocin and fish osmoregulation

Arginine vasotocin and fish osmoregulation

Neurohypophysial Hormonal Control of Kidney Function in the European Eel (Anguilla Anguilla L.) Adapted to Sea-Water or Fresh Water

Arguments biochimiques et histologiques en faveur du transport et de l'accumulation parall�les des hormones et des grains de neuros�cr�tion chez l'anguille hypophysectomis�e

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