Corticotrophin-releasing factor receptor 2 mediates the enhanced activation of satiety-related responses through oxytocin neurons in the paraventricular nucleus of the hypothalamus after adrenalectomy

Autor(es)

Uchoa, Ernane Torres ^{[1, 2]} ; Rorato, Rodrigo ^[1] ; Ruginsk, Silvia Graciela ^{[1, 3]} ; Borges, Beatriz de Carvalho ^[1] ; Antunes-Rodrigues, Jose ^[1] ; Elias, Lucila L. K. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Physiol, Sch Med Ribeirao Preto, Sao Paulo - Brazil

^[2] Univ Estadual Londrina, Dept Physiol Sci, BR-86051990 Londrina, PR - Brazil

^[3] Univ Fed Alfenas, Inst Biomed Sci, Dept Physiol Sci, Alfenas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neuroscience Letters; v. 606, p. 123-128, OCT 8 2015.
• Citações Web of Science: 1

Resumo

Adrenalectomy (ADX)-induced hypophagia is associated with increased activation of corticotrophin-releasing factor (CRF) and oxytocin (OT) neurons in the paraventricular nucleus of the hypothalamus (PVN) after refeeding. CRF2- and OT-receptor antagonists abolish the hypophagia and the augmented activation of the nucleus of the solitary tract neurons induced by feeding after ADX. In addition, OT-receptor antagonist reversed CRF-induced anorexia. We evaluated the effect of intracerebroventricular pretreatment with CRF2-receptor antagonist, antisauvagine-30 (AS30), on the activation of OT neurons of the PVN in response to refeeding of sham, adrenalectomized (ADX) and ADX rats replaced with corticosterone (ADX+B). In vehicle-pretreated animals, refeeding increased the number of Fos + OT double labeled neurons in the posterior parvocellular subdivision of the PVN (PaPo) of sham, ADX and ADX+B animals, with higher Fos expression and OT neuronal activation in the ADX group. AS30 reversed refeedinginduced increased activation of OT and non-OT neurons in the PaPo in the ADX group. In the medial parvocellular subdivision of the PVN (PaMP) of vehicle-pretreated animals, the number of Fos- and Fos + OT-immunoreactive neurons was increased after refeeding in ADX group. AS30 in the ADX group attenuated the enhanced Fos expression but not the number of Fos + OT double labeled neurons in the PaMP. In conclusion, CRF2-receptor antagonist reverses the increased activation of OT neurons in the PaPo induced by feeding in ADX animals, suggesting that OT neurons might be downstream mediators of CRF effects on satiety-related responses after ADX. (C) 2015 Elsevier Ireland Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/09223-7 - Regulação neuroendócrina do equilíbrio hidrossalino e da ingestão alimentar: aspectos fisiológicos, fisiopatológicos e moleculares.
• Beneficiário: Ernane Torres Uchôa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/09799-1 - Regulação da homeostase energética e do balanço hidromineral: das células aos sistemas fisiológicos
• Beneficiário: José Antunes Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 08/50611-8 - Regulação neuroendócrina do equilíbrio hidrossalino e da ingestão alimentar: aspectos fisiológicos, fisiopatológicos e moleculares
• Beneficiário: José Antunes Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Temático