title: A role for presynaptic alpha 2-adrenoceptors in angiotensin II-induced drinking in rats.
abstract: Studies from this laboratory have shown that either central or peripheral administration of clonidine, the alpha 2-adrenoceptor agonist, can attenuate a variety of dipsogenic stimuli in rats. Further, yohimbine and tolazoline, alpha 2-adrenoceptor antagonists, augment the drinking response to both peripherally administered isoproterenol and angiotensin II. Studies reported here establish a dose-inhibition relationship between the dose of clonidine administered (2 to 32 micrograms/kg) intracerebroventricularly (IVT) and inhibition of the drinking response to peripherally administered angiotensin II (200 micrograms/kg. SC). DI50 was approximately 4 micrograms/kg. Yohimbine (300 micrograms/kg, SC) reversed the antidipsogenic effect of centrally administered clonidine (32 micrograms/kg, IVT) on angiotensin II-induced (200 micrograms/kg, SC) water intake. Phenylephrine, an alpha 2-adrenoceptor agonist, administered IVT (40 and 80 micrograms/kg) also inhibited angiotensin II-induced drinking in a dose-related fashion. The antidipsogenic effect of phenylephrine (80 micrograms/kg) was blocked by administration of yohimbine (300 micrograms/kg. SC). Thus, this effect of phenylephrine most likely occurs by way of alpha 2-adrenoceptors. These results support a role for the pre-synaptic alpha 2-adrenoceptor in the mediation of drinking in rats. Activation of alpha 2-adrenoceptors is accompanied by reduced water intake while inhibition of these receptors enhances water intake.
mesh_terms: D000804:Angiotensin II / Q000494:pharmacology*; D000818:Animals; D003000:Clonidine / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004326:Drinking / Q000187:drug effects*; D004347:Drug Interactions; D005260:Female; D007276:Injections, Intraventricular; D010656:Phenylephrine / Q000008:administration & dosage; D051381:Rats; D011919:Rats, Inbred Strains; D011942:Receptors, Adrenergic, alpha / Q000502:physiology*; D013268:Stimulation, Chemical; D015016:Yohimbine / Q000008:administration & dosage
chemical_list: D011942:Receptors, Adrenergic, alpha; D000804:Angiotensin II; D010656:Phenylephrine; D015016:Yohimbine; D003000:Clonidine