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  • Title: Effect of a non-peptide angiotensin receptor antagonist on water intake caused by centrally administered carbachol in the rat.
    Author: Reis LC, Saad WA, Camargo LA, Renzi A, Menani JV.
    Journal: Braz J Med Biol Res; 1996 Feb; 29(2):245-7. PubMed ID: 8731356.
    Abstract:
    Angiotensin II (ANG II) administered centrally produces drinking by acting on subtype 1 ANG II (AT1) receptors. Carbachol, a cholinergic receptor agonist, also induces drinking behavior by a central action. In the present study we determined whether the response to carbachol also involves AT1 receptors. Male Holtzman rats (250-300 g) with stainless steel cannula implanted into the lateral ventricle (LV) were used. Water intake after injection of 0.15 M NaCl (1.0 microliter) into the LV was 0.2 +/- 0.01 ml/h (N = 8). The AT1 receptor antagonist DUP-753 (50 nmol/microliters) injected into the LV reduced water intake induced by ANG II (10 nmol/microliters) from 9.2 +/- 1.4 to 0.4 +/- 0.1 ml/h (N = 8), and water intake induced by carbachol (2 nmol/microliters) from 9.8 +/- 1.4 ml/h to 3.7 +/- 0.8 ml/h (N = 8). These results suggest that AT1 receptors play a role in the drinking behavior observed after central cholinergic stimulation in rats.
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