Evaluation of food intake and Fos expression in serotonergic neurons of raphe nuclei after intracerebroventricular injection of adrenaline in free-feeding rats

Autor(es)

Flores, Rafael Appel ^[1] ; da Silva, Eduardo Simao ^[2] ; Ribas, Anderson Savaris ^[1] ; Dambros Taschetto, Ana Paula ^[1] ; Zampieri, Thais Tessari ^[3] ; Donato, Jr., Jose ^[3] ; Paschoalini, Marta Aparecida ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Santa Catarina UFSC, Ctr Biol Sci CCB, Dept Physiol Sci, BR-88040970 Florianopolis, SC - Brazil

^[2] Reg Univ Blumenau FURB, Ctr Exact & Nat Sci CCEN, Dept Nat Sci, BR-89030903 Blumenau, SC - Brazil

^[3] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508900 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brain Research; v. 1678, p. 153-163, JAN 1 2018.
• Citações Web of Science: 1

Resumo

Previous studies indicate that the modification of adrenergic neurotransmission in median raphe nucleus (MRN) enhances or removes an inhibitory influence on food intake, possibly serotonergic, due to a presence of serotonin-producing neurons in that nucleus. Therefore, the aim of this study is evaluated whether the activity of neurons in the MRN and dorsal raphe nucleus (DRN) are affected by intracere-broventricular injection of adrenaline (AD) in free-feeding rats. Male Wistar rats with guide cannulae chronically implanted in the lateral ventricle were injected with AD followed by evaluation of ingestive behavioral parameters. Behavior was monitored and the amount of food ingested was assessed. The highest dose (20 nmol) of AD was the most effective dose in increasing food intake. Subsequently, AD 20 nmol was injected to study neuronal activity indicated by the presence of Fos protein and its co-localization with serotonergic neurons in the MRN and DRN of naive rats with or without access to food during the recording of behavior. The administration of AD 20 nmol increased Fos expression and double labeling with serotonergic neurons in the DRN in rats with access to food, but not in animals without access. No statistically significant changes in Fos expression were observed in the MRN in any of the experimental conditions tested. These results suggest that DRN serotonergic and non-serotonergic neurons are activated by post-prandial signals. In contrast, the absence of Fos expression in the MRN suggests that this nucleus does not participate in the circuit involved in the control of post-prandial satiety. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/15517-6 - Fatores moleculares envolvidos nas alterações metabólicas durante a gestação: papel do SOCS3
• Beneficiário: Thais Tessari Zampieri
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/18086-0 - Bases moleculares da resistência à leptina
• Beneficiário: Jose Donato Junior
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores