Brainstem metabotropic glutamate receptors reduce food intake and activate dorsal pontine and medullar structures after peripheral bacterial lipopolysaccharide administration

NEUROPHARMACOLOGY

卷:107

Article

Chaskiel, Lea^1,2  Paul, Flora^1,2  Gerstberger, Ruediger³  Huebschle, Thomas³  Konsman, Jan Pieter^1,2,4 

[1] CNRS, PsychoNeuroimmunol Nutr & Genet, UMR 5226, Bordeaux, France

[2] Univ Bordeaux, PsyNuGen, UMR 5226, 146 Rue Leo Saignat, F-33076 Bordeaux, France

[3] Univ Giessen, Inst Vet Physiol & Biochem, D-35392 Giessen, Germany

[4] Univ Bordeaux, CNRS, Resonance Magnet Syst Biol, UMR 5536, 146 Rue Leo Saignat, F-33076 Bordeaux, France

关键词: Anorexia;    Brainstem;    Food intake;    Glutamate;    Lipopolysaccharide;    Nucleus of the solitary tract;    Parabrachial nuclei;    Sickness behavior;   

DOI  :  10.1016/j.neuropharm.2016.03.030

来源: Elsevier

【 摘 要 】

During infection-induced inflammation food intake is reduced. Vagal and brainstem pathways are important both in feeding regulation and immune-to-brain communication. Glutamate is released by vagal afferent terminals in the nucleus of the solitary tract and by its neurons projecting to the parabrachial nuclei. We therefore studied the role of brainstem glutamate receptors in spontaneous food intake of healthy animals and during sickness-associated hypophagia after peripheral administration of bacterial lipopolysaccharides or interleukin-1beta. Brainstem group I and II metabotropic, but not ionotropic, glutamate receptor antagonism increased food intake both in saline- and lipopolysaccharide-treated rats. In these animals, expression of the cellular activation marker c-Fos in the lateral parabrachial nuclei and lipopolysaccharide-induced activation of the nucleus of the solitary tract rostral to the area postrema were suppressed. Group I metabotropic glutamate receptors did not colocalize with c-Fos or neurons regulating gastric function in these structures. Group I metabotropic glutamate receptors were, however, found on raphe magnus neurons that were part of the brainstem circuit innervating the stomach and on trigeminal and hypoglossal motor neurons. In conclusion, our findings show that brainstem metabotropic glutamate receptors reduce food intake and activate the lateral parabrachial nuclei as well as the rostral nucleus of the solitary tract after peripheral bacterial lipopolysaccharide administration. They also provide insight into potential group I metabotropic glutamate receptor dependent brainstem circuits mediating these effects. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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