Utilize este identificador para citar ou criar um atalho para este documento: http://hdl.handle.net/10923/903
Tipo: article
Título: Kinin B1 receptors mediate depression-like behavior response in stressed mice treated with systemic E. coli lipopolysaccharide
Autor(es): Viana, Alice F
Maciel, Izaque S
Dornelles, Fabiana N
Figueiredo, Cláudia P
Siqueira, Jarbas M
Campos, Maria Martha
Calixto, João B
Editora: BioMed Central
Data de Publicação: 2010
Volume: 7
Página Inicial: 1
Página Final: 12
Palavras-chave: KININS
Resumo: BACKGROUND: Kinin B1 receptors are inducible molecules up-regulated after inflammatory stimuli. This study evaluated the relevance of kinin B1 receptors in a mouse depression behavior model. METHODS: Mice were exposed to a 5-min swimming session, and 30 min later they were injected with E. coli lipopolysaccharide (LPS). Depression-like behavior was assessed by determining immobility time in a tail suspension test. Different brain structures were collected for molecular and immunohistochemical studies. Anhedonia was assessed by means of a sucrose intake test. RESULTS: Our protocol elicited an increase in depression-like behavior in CF1 mice, as assessed by the tail-suspension test, at 24 h. This behavior was significantly reduced by treatment with the selective B1 receptor antagonists R-715 and SSR240612. Administration of SSR240612 also prevented an increase in number of activated microglial cells in mouse hippocampus, but did not affect a reduction in expression of mRNA for brain-derived neurotrophic factor. The increased immobility time following LPS treatment was preceded by an enhancement of hippocampal and cortical B1 receptor mRNA expression (which were maximal at 1 h), and a marked production of TNFa in serum, brain and cerebrospinal fluid (between 1 and 6 h). The depression-like behavior was virtually abolished in TNFa p55 receptor-knockout mice, and increased B1 receptor mRNA expression was completely absent in this mouse strain. Furthermore, treatment with SSR240612 was also effective in preventing anhedonia in LPS-treated mice, as assessed using a sucrose preference test. CONCLUSION: Our data show, for the first time, involvement of kinin B1 receptors in depressive behavioral responses, in a process likely associated with microglial activation and TNFa production. Thus, selective and orally active B1 receptor antagonists might well represent promising pharmacological tools for depression therapy.
URI: http://hdl.handle.net/10923/903
DOI: 10.1186/1742-2094-7-98
PMID: 21194425
ISSN: 1742-2094
Aparece nas Coleções:Artigo de Periódico

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