Effect of L-5-Hydroxytryptophan on drinking behavior in Coturnix japonica (Temminck and Schlegel, 1849) (Galliformes: Aves): involvement of renin-angiotensin system

Brazilian Journal of Biology

Pl Cedraz-mercez¹  Ac Almeida¹  Cm Thomaz¹  Rh Costa-e-sousa¹  El Olivares¹  Ws Côrtes¹  Ma Medeiros¹  Lc Reis¹ 

[1] ,Universidade Federal Rural do Rio de Janeiro Instituto de Biologia Departamento de Ciências FisiológicasSeropédica RJ ,Brazil

关键词: drinking behavior;    renin-angiotensin system;    L-5-hydroxytryptophan;    thirst;    Coturnix japonica;    comportamento dipsogênico;    sistema renina-angiotensina;    -5-hidroxitriptofano;    sede;    Coturnix japonica;   

DOI  :  10.1590/S1519-69842007000400027

来源: SciELO

【 摘 要 】

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.

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