Antinociception induced by acute oral administration of sweet substance in young and adult rodents: The role of endogenous opioid peptides chemical mediators and mu(1)-opioid receptors

Autor(es)

de Freitas, Renato Leonardo ^{[1, 2]} ; Lopes Kuebler, Joao Marcus ^[1] ; Elias-Filho, Daoud Hibraim ^{[1, 2]} ; Coimbra, Norberto Cysne ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Farmacol, Lab Neuroanat & Neuropsicobiol, BR-14049900 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Inst Neurociencias & Comportamento, BR-14049900 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Pharmacology Biochemistry and Behavior; v. 101, n. 2, p. 265-270, APR 2012.
• Citações Web of Science: 16

Resumo

The present work aimed to investigate the effects of acute sucrose treatment on the perception of painful stimuli. Specifically, we sought to determine the involvement of the endogenous opioid peptide-mediated system as well as the role of the mu(1)-opioid receptor in antinociception organisation induced by acute sucrose intake. Nociception was assessed with the tail-flick test in rats (75, 150 and 250 g) of different ages acutely pre-treated with 500 mu L. of a sucrose solution (25, 50, 150 and 250 g/L) or tap water. Young and Adult rats (250 g) showed antinociception after treatment with 50 g/L (during 5 min) and 150 g/L and 250 g/L (during 20 min) sucrose solutions. Surprisingly, this antinociception was more consistent in mature adult rodents than in pups. To evaluate the role of opioid systems, mature adult rodents were pre-treated with different doses (0.25, 1 or 4mg/kg) of the non-selective opioid receptor antagonist naloxone, the selective pi-opioid receptor antagonist naloxonazine or vehicle followed by 250 g/L sucrose solution treatment. Sucrose-induced antinociception was reduced by pre-treatment with both naloxone and naloxonazine. The present findings suggest that sweet substance-induced hypo-analgesia is augmented by increasing sucrose concentrations in young and adult rodents. Acute oral sucrose treatment inhibits pain in laboratory animal by mediating endogenous opioid peptide and mu(1)-opioid receptor actions. (C) 2011 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 03/05256-1 - Caracterizacao de receptores serotoninergicos na analgesia pos-ictal: envolvimento do nucleo dorsal da rafe.
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 03/03118-0 - Estudo neuroanatômico funcional e neurofarmacológico do envolvimento do núcleo pre-tectal anterior e estruturas funcionalmente relacionadas em processos antinociceptivos
• Beneficiário: Andressa Daiane de Carvalho Zaparolli
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 01/03752-6 - Estudo do envolvimento de receptores m-opioides, colinérgicos muscarínicos e nicotínicos e serotonérgicos 5-HT2/1C na analgesia pós-ictal
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 02/01497-1 - Estudo do envolvimento do núcleo magno da rafe, do núcleo gigantocelular e núcleo pré-tectal anterior, e de receptores opiódes, kappa e delta serotoninérgicos 5HT2/1C, e noradrenérgicos alfa, beta, na analgesia pós-cital: um estudo neuroanatômico e neuropsicofisiológico em um modelo experimental de epilepsia
• Beneficiário: Daoud Hibrahim Elias Filho
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 09/17258-5 - Estudo do envolvimento do sistema nitrérgico e da neurotransmissão canabinoide e glutamatérgica do córtex pré-frontal medial na analgesia induzida por reações de fuga elaborada evocada pelo bloqueio GABAérgico do hipotálamo medial
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado