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Journal of Comparative Physiology B

, Volume 159, Issue 1, pp 91–95 | Cite as

Antidiuretic responses to osmotic cutaneous stimulation in the toad,Bufo arenarum

A possible adaptive control mechanism for urine production
  • Silvia Petriella
  • Juan C. Reboreda
  • Marcela Otero
  • Enrique T. Segura
Article

Summary

Osmotic stimulation of the skin of the toadBufo arenarum with isotonic (115 mM) or hypertonic (400 mM) NaCl solutions produced a marked and reversible antidiuresis within 5 min. No changes in plasma osmolarity were detected in the course of this response.

Hypophysectomized animals exhibited a lower and delayed antidiuresis when exposed to a hypertonic environment (400 mM NaCl). This antidiuretic response was drastically reduced in normal toads after ten consecutive days of administration of the sympatoplexic guanethidine.

The existence of a feed-forward control of urine production initiated by cutaneous osmotic sensors and involving an adrenergic component is proposed.

Key words

Antidiuresis Reflex Control Adaptive Toad 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Silvia Petriella
    • 1
  • Juan C. Reboreda
    • 1
  • Marcela Otero
    • 1
  • Enrique T. Segura
    • 1
  1. 1.Laboratorio de Fisiologia del ComportamientoInstituto de Biologia y Medicina ExperimentalBuenos AiresArgentina

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