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Abstract:

1. Subcutaneous administration of a sympathoplexic drug, guanethidine, induced intensive uptake of water across the skin of the toad, Bufo arenarum, maintained in fresh water, even after complete removal of the ADH producing system. Guanethidine had no effect in the midbrain lesioned toad. No significant changes in urine production were detected. 2. Phenoxybenzamine, an alpha-adrenergic blocker, closely reproduced the guanethidine effect. Conversely, the alpha-agonist metaraminol induced a decrease in water uptake with associated oliguria. 3. Microinjection of phenoxybenzamine into the brain increased water uptake when applied to the midbrain tegmentum and decreased urine production when applied to the forebrain. 4. The data show that an adrenergic mechanism is associated with the control of water uptake through toad skin. This mechanism is at least in part dependent on the midbrain tegmentum and not on the diencephalic ADH production system. The main function of this adrenergic control is probably to prevent excessive uptake of water in the intact animal during long sojourns in fresh water. It might also serve to prevent a leaching-out of electrolytes. © 1982 Springer-Verlag.

Registro:

Documento: Artículo
Título:Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel - II. Adrenergic control of water uptake across the skin
Autor:Segura, E.T.; Bandsholm, U.C.; Bronstein, A.
Filiación:Laboratorio de Fisiología del Comportamiento, Instituto de Biologia y Medicina Experimental, Obligado 2490, Buenos Aires, 1428, Argentina
Año:1982
Volumen:146
Número:1
Página de inicio:101
Página de fin:106
DOI: http://dx.doi.org/10.1007/BF00688722
Título revista:Journal of Comparative Physiology ■ B
Título revista abreviado:J Comp Physiol B
ISSN:01741578
CODEN:JCPBD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01741578_v146_n1_p101_Segura

Referencias:

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  • Adolph, E.F., Influences of the nervous system on the intake and excretion of water by the frog (1934) Journal of Cellular and Comparative Physiology, 5, pp. 123-139
  • Bakker, H.R., Bradswhaw, S.D., Effect of hypothalamic lesions on water metabolism of the toad Bufo marinus (1977) J Endocrinol, 75, pp. 161-172
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  • Schoffeniels, E., Salée, M-L, The effects of the electrical stimulation of the brachial plexus of the potential difference of frog skin (1965) Comp Biochem Physiol, 14, pp. 587-602
  • Segura, E.T., Kacelnik, A., Cardiorespiratory and electroencephalographic responses to the stimulation of the mesencephalic tegmentum in toads, lizards and rats (1977) Exp Neurol, 57, pp. 364-373
  • Segura ET, Bandsholm UC, Bronstein A (1980) Neural control of water intake across the skin of toad. VIIth International Conference on the Physiology of Food and Fluid Intake, ‘IUPS’, Warsaw, July 7–10, 1980. Volume of Abstracts, p 101; Segura, E.T., Bandsholm, U.C., Bronstein, A., Woscoboinik, D., Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel. I. Effects of handling, brain lesions, anesthesia and reversible coma upon water uptake, urine production and overall water balance (1982) J Comp Physiol, 146, pp. 95-100
  • Shoemaker, V.H., Waring, H., Effect of hypothalamic lesions on the water-balance response of a toad, Bufo marinus (1968) Comp Biochem Physiol, 24, pp. 47-54
  • Vivien-Roels, B., Guerne, J.M., Holder, F.C., Schroeder, M.D., Comparative immunohistochemical, radioimmunological and biological attempt to identify arginine-vasotocin (AVT) in the pineal gland of reptiles and fishes (1979) Prog Brain Res, 52, pp. 459-463

Citas:

---------- APA ----------
Segura, E.T., Bandsholm, U.C. & Bronstein, A. (1982) . Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel - II. Adrenergic control of water uptake across the skin. Journal of Comparative Physiology ■ B, 146(1), 101-106.
http://dx.doi.org/10.1007/BF00688722
---------- CHICAGO ----------
Segura, E.T., Bandsholm, U.C., Bronstein, A. "Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel - II. Adrenergic control of water uptake across the skin" . Journal of Comparative Physiology ■ B 146, no. 1 (1982) : 101-106.
http://dx.doi.org/10.1007/BF00688722
---------- MLA ----------
Segura, E.T., Bandsholm, U.C., Bronstein, A. "Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel - II. Adrenergic control of water uptake across the skin" . Journal of Comparative Physiology ■ B, vol. 146, no. 1, 1982, pp. 101-106.
http://dx.doi.org/10.1007/BF00688722
---------- VANCOUVER ----------
Segura, E.T., Bandsholm, U.C., Bronstein, A. Role of the CNS in the control of the water economy of the toad Bufo arenarum Hensel - II. Adrenergic control of water uptake across the skin. J Comp Physiol B. 1982;146(1):101-106.
http://dx.doi.org/10.1007/BF00688722