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Related Experiment Videos

Central angiotensin converting enzyme-blockade and thirst

W A Saad1, A C Luiz, L A Camargo

  • 1Departamento de Fisiologia, Faculdade de Odontologia, Universidade Estadual Paulista, Araraquara, SP, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|September 1, 1993
PubMed
Summary

Lisinopril, an angiotensin converting enzyme (ACE) inhibitor, significantly reduced water intake in rats when injected into the medial preoptic area (MPOA). This suggests central ACE activation in the MPOA is crucial for regulating thirst responses.

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Area of Science:

  • Neuroscience
  • Physiology
  • Pharmacology

Background:

  • Angiotensin converting enzyme (ACE) plays a role in regulating body fluid balance.
  • The medial preoptic area (MPOA) is a key brain region involved in thirst and water intake.
  • Understanding the central mechanisms of thirst regulation is crucial for addressing fluid balance disorders.

Purpose of the Study:

  • To investigate the effect of inhibiting ACE within the MPOA on water intake in rats.
  • To determine the role of central ACE activation in mediating dipsogenic responses to various stimuli.

Main Methods:

  • Male Holtzman rats were injected with lisinopril, a potent ACE inhibitor, directly into the MPOA.
  • Water intake was measured after inducing thirst through subcutaneous injections of isoprenaline, polyethyleneglycol, or hypertonic saline, as well as through water deprivation.

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  • Control groups received vehicle injections.

    • Main Results:

    • Lisinopril injection into the MPOA abolished water intake induced by isoprenaline and water deprivation.
    • It significantly reduced water intake stimulated by polyethyleneglycol and hypertonic saline.
    • These effects were observed at specific time points post-injection, indicating a time-dependent action.

    Conclusions:

    • Central ACE activation, particularly within the MPOA, is a critical component of the dipsogenic response.
    • Inhibiting ACE in the MPOA disrupts normal water intake regulation.
    • These findings highlight the MPOA's role in integrating signals related to thirst and fluid balance.