Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado

Detalhes bibliográficos
Autor(a) principal: Tavares, Ligia Renata Rodrigues
Data de Publicação: 2016
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UFSCAR
Texto Completo: https://repositorio.ufscar.br/handle/ufscar/8172
Resumo: Previous studies have implicated the 5HT1A and 5HT2C serotonin receptors subtypes located within the amygdala in the modulation of defensive behaviors in rodents exposed to the elevated plus-maze (EPM). Further studies have shown that exposure to a threatening stimulus can result in pain inhibition. This study evaluated the effects of intra-amygdala injections of 5HT1A and 5HT2C receptor agonists on open arms antinociception (OAA) in the EPM, and possible alterations of this response with concomitant fluoxetine treatment. Male Swiss mice received 0.1 μl intra-amygdala injections of either 5.6 or 10 nmol of 8-OHDPAT, a 5-HT1A receptor agonist, and an i.p. injection of 0.6% acetic acid, a nociceptive stimulus. After confirming the start of writhing, half of the animals in each group were confined to the OA and half to the EA of the EPM, to record the number of writhes during a five-minute period (Experiment 1) A similar experimental protocol was repeated in the experiments described below. Subsequently, the animals received combined injections of fluoxetine (2.5mg/kg) and 10 nmol of 8-OHDPAT (Experiment 2). In Experiment 3, the animals received injections of either 0.21 or 0.63 nmol of MK-212, a 5-HT2C receptor agonist, and combined injections of fluoxetine (2.5mg/kg) and 0.63 nmol of MK-212 (Experiment 4). Our results showed that intra-amygdala infusions of 8-OH-DPAT enhanced nociception in both arms. Combined administration of fluoxetine and 8-OH-DPAT did not alter the observed effects. Injection of MK-212 increased the OAA, while combined administration of fluoxetine and MK-212 reversed the increase in OAA observed with MK-212 injection. These findings suggest that OAA is mediated by 5-HT2C and 5-HT1A receptors located in the amygdala. Fluoxetine interacted with 5-HT2C receptors, blocking the increase of OAA induced by activation of this serotonin receptor subtype.
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spelling Tavares, Ligia Renata RodriguesSouza, Azair Liane Matos do Canto dehttp://lattes.cnpq.br/2352004564367849Souza, Daniela Baptista dehttp://lattes.cnpq.br/6261369005670849http://lattes.cnpq.br/7763180377066531d20fba21-95c5-4d08-9137-ada2927a9ce32016-10-21T14:03:27Z2016-10-21T14:03:27Z2016-03-23TAVARES, Ligia Renata Rodrigues. Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado. 2016. Dissertação (Mestrado em Ciências Fisiológicas) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8172.https://repositorio.ufscar.br/handle/ufscar/8172Previous studies have implicated the 5HT1A and 5HT2C serotonin receptors subtypes located within the amygdala in the modulation of defensive behaviors in rodents exposed to the elevated plus-maze (EPM). Further studies have shown that exposure to a threatening stimulus can result in pain inhibition. This study evaluated the effects of intra-amygdala injections of 5HT1A and 5HT2C receptor agonists on open arms antinociception (OAA) in the EPM, and possible alterations of this response with concomitant fluoxetine treatment. Male Swiss mice received 0.1 μl intra-amygdala injections of either 5.6 or 10 nmol of 8-OHDPAT, a 5-HT1A receptor agonist, and an i.p. injection of 0.6% acetic acid, a nociceptive stimulus. After confirming the start of writhing, half of the animals in each group were confined to the OA and half to the EA of the EPM, to record the number of writhes during a five-minute period (Experiment 1) A similar experimental protocol was repeated in the experiments described below. Subsequently, the animals received combined injections of fluoxetine (2.5mg/kg) and 10 nmol of 8-OHDPAT (Experiment 2). In Experiment 3, the animals received injections of either 0.21 or 0.63 nmol of MK-212, a 5-HT2C receptor agonist, and combined injections of fluoxetine (2.5mg/kg) and 0.63 nmol of MK-212 (Experiment 4). Our results showed that intra-amygdala infusions of 8-OH-DPAT enhanced nociception in both arms. Combined administration of fluoxetine and 8-OH-DPAT did not alter the observed effects. Injection of MK-212 increased the OAA, while combined administration of fluoxetine and MK-212 reversed the increase in OAA observed with MK-212 injection. These findings suggest that OAA is mediated by 5-HT2C and 5-HT1A receptors located in the amygdala. Fluoxetine interacted with 5-HT2C receptors, blocking the increase of OAA induced by activation of this serotonin receptor subtype.Estudos têm demonstrado que os subtipos de receptores serotonérgicos 5HT1A e 5HT2C localizados na amígdala estão envolvidos na modulação de comportamentos defensivos avaliados em camundongos expostos ao labirinto em cruz elevado (LCE). Além disso, evidências demonstram que a exposição a situações ameaçadoras podem resultar em inibição da dor. Este estudo avaliou os efeitos da fluoxetina sobre a modulação da nocicepção pelos receptores 5-HT1A e 5-HT2C da amígdala em camundongos confinados nos braços abertos (BA) e fechados (BF) do LCE. Camundongos machos da linhagem suíço-albino receberam 0,1ul de injeções intra-amígdala de 8-OH-DPAT (agonista do receptor 5HT1A) nas doses de 5,6 ou 10 nmol e em seguida, uma injeção de ácido acético (estímulo nociceptivo), 0,6% (0,1ml/10g por peso corpóreo, i.p.). Após a confirmação do início das contorções, os camundongos foram confinados no BA ou BF do LCE durante 5 minutos para o registro do número de contorções abdominais (Experimento 1). Este protocolo sucedeu-se para os demais experimentos. Subsequentemente, os animais receberam injeções combinadas de fluoxetina (2,5 mg/kg, s.c.) e 10 nmol de 8-OH-DPAT intra-amígdala (Experimento 2). No experimento 3, os animais receberam injeções intra-amígdala de 0,21 ou 0,63mol de MK-212 (agonista do receptor 5-HT2C) e injeções combinadas de fluoxetina (2,5 mg/kg, s.c.) e 0,63nmol de MK-212 intra-amígdala (Experimento 4). Os nossos resultados mostraram que as injeções intraamígdalade 8-OH-DPAT acentuaram a nocicepção nos animais confinados em ambos os braços do LCE. A administração combinada de fluoxetina, e 8-OH-DPAT intra-amígdala não alterou os efeitos observados deste agonista do receptor 5HT1A. A microinjeção de MK-212 aumentou a antinocicepção induzida pelo BA, enquanto a administração combinada de fluoxetina e MK-212 intra-amígdala reverteu o aumento da antinocicepção induzida pelo BA observado com a microinjeção de MK-212 intra-amígdala. Estes resultados mostram que a antinocicepção induzida pelo BA do LCE pode ser mediada tanto pelos receptores 5-HT1A como por receptores 5-HT2C localizados na amígdala de camundongos. Entretanto, o bloqueio do aumento da antinocicepção induzida por situações aversivas promovido pela fluoxetina ocorreu apenas na interação com os receptores 5-HT2C.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)porUniversidade Federal de São CarlosCâmpus São CarlosPrograma Interinstitucional de Pós-Graduação em Ciências Fisiológicas - PIPGCFUFSCarAntinocicepçãoSerotoninaFluoxetinaAmígdalaCamundongosAntinociceptionElevated plus-mazeSerotoninFluoxetineAmygdalaMiceCIENCIAS BIOLOGICASModulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevadoinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnline600600ec59bf11-8f1b-4d55-a0dd-35037d3bb124info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDissLRRT.pdfDissLRRT.pdfapplication/pdf1317373https://repositorio.ufscar.br/bitstream/ufscar/8172/1/DissLRRT.pdf51206e583775263173013e3c30ea57ebMD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://repositorio.ufscar.br/bitstream/ufscar/8172/2/license.txtae0398b6f8b235e40ad82cba6c50031dMD52TEXTDissLRRT.pdf.txtDissLRRT.pdf.txtExtracted texttext/plain115519https://repositorio.ufscar.br/bitstream/ufscar/8172/3/DissLRRT.pdf.txt9d02f0c3e182363617c6795e34332ee6MD53THUMBNAILDissLRRT.pdf.jpgDissLRRT.pdf.jpgIM Thumbnailimage/jpeg8584https://repositorio.ufscar.br/bitstream/ufscar/8172/4/DissLRRT.pdf.jpgefac923412ff26d6cf4ce52d8a806ac0MD54ufscar/81722023-09-18 18:31:00.682oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false
dc.title.por.fl_str_mv Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
title Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
spellingShingle Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
Tavares, Ligia Renata Rodrigues
Antinocicepção
Serotonina
Fluoxetina
Amígdala
Camundongos
Antinociception
Elevated plus-maze
Serotonin
Fluoxetine
Amygdala
Mice
CIENCIAS BIOLOGICAS
title_short Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
title_full Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
title_fullStr Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
title_full_unstemmed Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
title_sort Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado
author Tavares, Ligia Renata Rodrigues
author_facet Tavares, Ligia Renata Rodrigues
author_role author
dc.contributor.authorlattes.por.fl_str_mv http://lattes.cnpq.br/7763180377066531
dc.contributor.author.fl_str_mv Tavares, Ligia Renata Rodrigues
dc.contributor.advisor1.fl_str_mv Souza, Azair Liane Matos do Canto de
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/2352004564367849
dc.contributor.advisor-co1.fl_str_mv Souza, Daniela Baptista de
dc.contributor.advisor-co1Lattes.fl_str_mv http://lattes.cnpq.br/6261369005670849
dc.contributor.authorID.fl_str_mv d20fba21-95c5-4d08-9137-ada2927a9ce3
contributor_str_mv Souza, Azair Liane Matos do Canto de
Souza, Daniela Baptista de
dc.subject.por.fl_str_mv Antinocicepção
Serotonina
Fluoxetina
Amígdala
Camundongos
topic Antinocicepção
Serotonina
Fluoxetina
Amígdala
Camundongos
Antinociception
Elevated plus-maze
Serotonin
Fluoxetine
Amygdala
Mice
CIENCIAS BIOLOGICAS
dc.subject.eng.fl_str_mv Antinociception
Elevated plus-maze
Serotonin
Fluoxetine
Amygdala
Mice
dc.subject.cnpq.fl_str_mv CIENCIAS BIOLOGICAS
description Previous studies have implicated the 5HT1A and 5HT2C serotonin receptors subtypes located within the amygdala in the modulation of defensive behaviors in rodents exposed to the elevated plus-maze (EPM). Further studies have shown that exposure to a threatening stimulus can result in pain inhibition. This study evaluated the effects of intra-amygdala injections of 5HT1A and 5HT2C receptor agonists on open arms antinociception (OAA) in the EPM, and possible alterations of this response with concomitant fluoxetine treatment. Male Swiss mice received 0.1 μl intra-amygdala injections of either 5.6 or 10 nmol of 8-OHDPAT, a 5-HT1A receptor agonist, and an i.p. injection of 0.6% acetic acid, a nociceptive stimulus. After confirming the start of writhing, half of the animals in each group were confined to the OA and half to the EA of the EPM, to record the number of writhes during a five-minute period (Experiment 1) A similar experimental protocol was repeated in the experiments described below. Subsequently, the animals received combined injections of fluoxetine (2.5mg/kg) and 10 nmol of 8-OHDPAT (Experiment 2). In Experiment 3, the animals received injections of either 0.21 or 0.63 nmol of MK-212, a 5-HT2C receptor agonist, and combined injections of fluoxetine (2.5mg/kg) and 0.63 nmol of MK-212 (Experiment 4). Our results showed that intra-amygdala infusions of 8-OH-DPAT enhanced nociception in both arms. Combined administration of fluoxetine and 8-OH-DPAT did not alter the observed effects. Injection of MK-212 increased the OAA, while combined administration of fluoxetine and MK-212 reversed the increase in OAA observed with MK-212 injection. These findings suggest that OAA is mediated by 5-HT2C and 5-HT1A receptors located in the amygdala. Fluoxetine interacted with 5-HT2C receptors, blocking the increase of OAA induced by activation of this serotonin receptor subtype.
publishDate 2016
dc.date.accessioned.fl_str_mv 2016-10-21T14:03:27Z
dc.date.available.fl_str_mv 2016-10-21T14:03:27Z
dc.date.issued.fl_str_mv 2016-03-23
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dc.identifier.citation.fl_str_mv TAVARES, Ligia Renata Rodrigues. Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado. 2016. Dissertação (Mestrado em Ciências Fisiológicas) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8172.
dc.identifier.uri.fl_str_mv https://repositorio.ufscar.br/handle/ufscar/8172
identifier_str_mv TAVARES, Ligia Renata Rodrigues. Modulação dos receptores 5-HT1A e 5-HT2C DO complexo amigdalóide sobre os efeitos da fluoxetina na antinocicepção induzida pelo confinamento de camundongos aos braços do labirinto em cruz elevado. 2016. Dissertação (Mestrado em Ciências Fisiológicas) – Universidade Federal de São Carlos, São Carlos, 2016. Disponível em: https://repositorio.ufscar.br/handle/ufscar/8172.
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