1. Effect of L-5-Hydroxytryptophan on drinking behavior in Coturnix japonica (Temminck and Schlegel, 1849) (Galliformes: Aves): involvement of renin-angiotensin system.
- Author
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Cedraz-Mercez PL, Almeida AC, Thomaz CM, Costa-e-Sousa RH, Olivares EL, Côrtes WS, Medeiros MA, and Reis LC
- Subjects
- Angiotensin-Converting Enzyme Inhibitors pharmacology, Animals, Captopril pharmacology, Drinking Behavior physiology, Male, Renin-Angiotensin System physiology, Time Factors, 5-Hydroxytryptophan pharmacology, Coturnix physiology, Drinking Behavior drug effects, Renin-Angiotensin System drug effects
- Abstract
The purpose of this study was to explore the role of L-5-hydroxytryptophan (L-HTP) and its relationship with the renin-angiotensin system (RAS) on the drinking behavior in Japanese quails. Normally-hydrated quails that received injections of L-HTP (12.5; 25 and 50 mg.kg-1) by the intracoelomic route (ic) expressed an increase in water intake, which was inhibited by captopril, an angiotensin converting enzyme (ACE) inhibitor. In addition, captopril also induced such a response in birds under previous fluid deprivation. High doses of captopril (35-70 mg.kg-1, sc) in normally-hydrated quails decreased the spontaneous water intake while low doses of captopril (2-5 mg.kg-1, sc) did not prompt water intake after L-HTP administration. Losartan, an AT1 receptor antagonist in mammals, did not change the water intake levels in normally-hydrated or water-deprivated birds. Serotonin (5-HT) injections did not provoke its known dipsogenic response.
- Published
- 2007
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