Interaction of serotonin and cholecystokinin in the lateral parabrachial nucleus to control sodium intake

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Data

2001-05-01

Autores

De Gobbi, JIF
De Luca, L. A.
Johnson, A. K.
Menani, José Vanderlei [UNESP]

Título da Revista

ISSN da Revista

Título de Volume

Editor

Amer Physiological Soc

Resumo

Serotonin [5-hydroxytryptamine (5-HT)] and CCK injected into the lateral parabrachial nucleus (LPBN) inhibit NaCl and water intake. In this study, we investigated interactions between 5-HT and CCK into the LPBN to control water and NaCl intake. Male Holtzman rats with cannulas implanted bilaterally in the LPBN were treated with furosemide + captopril to induce water and NaCl intake. Bilateral LPBN injections of high doses of the 5-HT antagonist methysergide (4 mug) or the CCK antagonist proglumide (50 mug), alone or combined, produced similar increases in water and 1.8% NaCl intake. Low doses of methysergide (0.5 mug) + proglumide (20 mug) produced greater increases in NaCl intake than when they were injected alone. The 5-HT2a/2c agonist 2,5-dimetoxy-4-iodoamphetamine hydrobromide (DOI; 5 mug) into the LPBN reduced water and NaCl intake. After proglumide (50 mug) + DOI treatment, the intake was not different from vehicle treatment. CCK-8 (1 mug) alone produced no effect. CCK-8 combined with methysergide (4 mug) reduced the effect of methysergide on NaCl intake. The data suggest that functional interactions between 5-HT and CCK in the LPBN may be important for exerting inhibitory control of NaCl intake.

Descrição

Palavras-chave

5-hydroxytryptamine, proglumide, methysergide, NaCl intake, sodium appetite, angiotensin II

Como citar

American Journal of Physiology-regulatory Integrative and Comparative Physiology. Bethesda: Amer Physiological Soc, v. 280, n. 5, p. R1301-R1307, 2001.