Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio
Autor(a) principal: | |
---|---|
Data de Publicação: | 2006 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/1279 |
Resumo: | Hypothalamic paraventricular nucleus (PVN) has an important role in the hydroeletrolytic balance and it also participates in the regulation of water and sodium intake. Recent researches described the presence of 5-HT1 receptors in the central nervous system, standing out the subtypes 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D. The receptor 5-HT1A was one of the firsts to be identified and it is found in the somatodendritic and pos-synaptic forms. It has been showed the participation of PVN 5-HT1A receptor in the hydroeletrolytic balance. Therefore, the aim of this study was: a) To investigate the effects of bilateral injections of serotonin (5-HT) in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; b) To investigate the effects of 8-OH-DPAT injection, an 5-HT1A agonist, in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; c) To investigate the action of pMPPF, an 5-HT1A antagonist, into the PVN on the effects of 5-HT and 8-OH-DPAT on the water and 1.8% NaCl intake. Holtzman rats (280-320 g) were submitted to the implant of cannulas bilaterally in the PVN. For the implant, the animals were adapted to a stereotaxic apparatus. Using the bregma, introduction points of the stainless steel cannulas were identified according to the coordinates: 1.8 mm caudal to bregma, 0.6 mm lateral to the midline and 5.0 mm below dura mater. 5-HT injections (10, 20, 40 and 50 µg/ 0,2 µl) in the PVN reduced the water intake (13.4±2.0; 12.6±1.3; 12.9±1.0 and 9.0±2.9 ml/ 30 min vs. sal: 18.4±0.8 ml/ 30 min, respectively, n = 6-8) and the doses 10 and 20 µg/ 0.2 µl reduced the 1.8% NaCl intake (7.9 ± 3.0 and 9.0 ± 2.1 ml/ 30 min, respectively, vs. sal: 17.7 ± 1.8 ml/ 30 min, n = 7). 8-OH-DPAT injections (1.0, 2.5 and 5.0 µg/ 0.2 µl) in the PVN reduced the water intake (15.4 ± 1.3; 14.8 ± 1.2 and 14.2 ± 0.9 ml/ 120 min vs. sal: 19.1 ± 1.0 ml/ 120 min, n = 10) and the doses 2.5 µg and 5 µg also reduced 1.8% NaCl intake (12.4 ± 2.7 ml/ 60 min vs. sal: 19.3 ± 1.0 ml/ 60 min; 12.2 ± 1.8 ml/ 120 min vs. sal: 20.0 ± 1.0 ml/ 120 min, respectively, n = 9). pMPPF bilateral injections (5-HT1A antagonist) preview to 8-OH-DPAT injections have completely blocked the inhibitory effect over water intake (sal + DPAT: 13.8 ± 1.1 ml/ 90 min vs. pMPPF + DPAT: 16.4 ± 1.1 ml/ 90 min, n = 12) and 1.8% NaCl (sal + DPAT: 11.4 ± 2.9 ml/ 30 min vs. pMPPF + DPAT: 17.6 ± 1.7 ml/ 30 min, n = 8). 5-HT1A antagonist partially reduced the inhibitory effect of 5-HT on water intake induced by water deprivation (sal+5-HT: 5.9±1.6 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.1 ml/ 30 min, n=12) as well as on sodium intake induced by sodium depletion (sal+5-HT: 2.8±1.3 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.9 ml/ 30 min, n=15). Our results demonstrate the presence of serotonergic mechanisms in PVN inhibiting water and sodium intake and also the participation of pos-synaptic 5-HT1A receptors on water intake control induced by water deprivation and on sodium intake induced by sodium depletion, and that this receptor doesn t have a tonic inhibitory effect. This work also showed others subtypes serotonergic PVN receptors participating in the dipsogenesis and natriorexigenesis control. |
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Villa, Patrícia de SouzaCamargo, Luiz Antonio de Arrudahttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4793576Z0http://buscatextual.cnpq.br/buscatextual/index.jsp479a3617-e110-4fb5-926d-ca71356eb5bc2016-06-02T19:22:46Z2007-08-212016-06-02T19:22:46Z2006-04-20VILLA, Patrícia de Souza. Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio.. 2006. 90 f. Dissertação (Mestrado em Ciências Biológicas) - Universidade Federal de São Carlos, São Carlos, 2006.https://repositorio.ufscar.br/handle/ufscar/1279Hypothalamic paraventricular nucleus (PVN) has an important role in the hydroeletrolytic balance and it also participates in the regulation of water and sodium intake. Recent researches described the presence of 5-HT1 receptors in the central nervous system, standing out the subtypes 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D. The receptor 5-HT1A was one of the firsts to be identified and it is found in the somatodendritic and pos-synaptic forms. It has been showed the participation of PVN 5-HT1A receptor in the hydroeletrolytic balance. Therefore, the aim of this study was: a) To investigate the effects of bilateral injections of serotonin (5-HT) in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; b) To investigate the effects of 8-OH-DPAT injection, an 5-HT1A agonist, in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; c) To investigate the action of pMPPF, an 5-HT1A antagonist, into the PVN on the effects of 5-HT and 8-OH-DPAT on the water and 1.8% NaCl intake. Holtzman rats (280-320 g) were submitted to the implant of cannulas bilaterally in the PVN. For the implant, the animals were adapted to a stereotaxic apparatus. Using the bregma, introduction points of the stainless steel cannulas were identified according to the coordinates: 1.8 mm caudal to bregma, 0.6 mm lateral to the midline and 5.0 mm below dura mater. 5-HT injections (10, 20, 40 and 50 µg/ 0,2 µl) in the PVN reduced the water intake (13.4±2.0; 12.6±1.3; 12.9±1.0 and 9.0±2.9 ml/ 30 min vs. sal: 18.4±0.8 ml/ 30 min, respectively, n = 6-8) and the doses 10 and 20 µg/ 0.2 µl reduced the 1.8% NaCl intake (7.9 ± 3.0 and 9.0 ± 2.1 ml/ 30 min, respectively, vs. sal: 17.7 ± 1.8 ml/ 30 min, n = 7). 8-OH-DPAT injections (1.0, 2.5 and 5.0 µg/ 0.2 µl) in the PVN reduced the water intake (15.4 ± 1.3; 14.8 ± 1.2 and 14.2 ± 0.9 ml/ 120 min vs. sal: 19.1 ± 1.0 ml/ 120 min, n = 10) and the doses 2.5 µg and 5 µg also reduced 1.8% NaCl intake (12.4 ± 2.7 ml/ 60 min vs. sal: 19.3 ± 1.0 ml/ 60 min; 12.2 ± 1.8 ml/ 120 min vs. sal: 20.0 ± 1.0 ml/ 120 min, respectively, n = 9). pMPPF bilateral injections (5-HT1A antagonist) preview to 8-OH-DPAT injections have completely blocked the inhibitory effect over water intake (sal + DPAT: 13.8 ± 1.1 ml/ 90 min vs. pMPPF + DPAT: 16.4 ± 1.1 ml/ 90 min, n = 12) and 1.8% NaCl (sal + DPAT: 11.4 ± 2.9 ml/ 30 min vs. pMPPF + DPAT: 17.6 ± 1.7 ml/ 30 min, n = 8). 5-HT1A antagonist partially reduced the inhibitory effect of 5-HT on water intake induced by water deprivation (sal+5-HT: 5.9±1.6 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.1 ml/ 30 min, n=12) as well as on sodium intake induced by sodium depletion (sal+5-HT: 2.8±1.3 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.9 ml/ 30 min, n=15). Our results demonstrate the presence of serotonergic mechanisms in PVN inhibiting water and sodium intake and also the participation of pos-synaptic 5-HT1A receptors on water intake control induced by water deprivation and on sodium intake induced by sodium depletion, and that this receptor doesn t have a tonic inhibitory effect. This work also showed others subtypes serotonergic PVN receptors participating in the dipsogenesis and natriorexigenesis control.O núcleo paraventricular do hipotálamo (NPV) tem uma importante participação no controle do balanço hidroeletrolítico estando envolvido também na regulação da ingestão de água e sódio. Pesquisas recentes mostraram a presença de receptores do tipo 5- HT1 no sistema nervoso central, destacando-se os subtipos 5-HT1A, 5-HT1B, 5-HT1C e 5-HT1D. O receptor 5-HT1A foi um dos primeiros a ser identificado e é encontrado nas formas somatodendrítica e pós-sináptica. Estudos anteriores demonstraram o envolvimento dos receptores 5-HT1A do NPV do hipotálamo no controle do equilíbrio hidroeletrolítico. Portanto, os objetivos deste estudo foram: a) investigar os efeitos de injeções bilaterais de serotonina (5-HT) no NPV sobre a ingestão de água induzida por privação hídrica e sobre a ingestão de água e NaCl 1,8% induzida por depleção de sódio; b) investigar os efeitos da injeção de 8-OH-DPAT, agonista 5-HT1A, no NPV sobre a ingestão de água induzida por privação hídrica e sobre a ingestão de água e NaCl 1,8% induzida por depleção de sódio; c) investigar a ação do pMPPF, antagonista 5-HT1A, no NPV sobre os efeitos da 5-HT e do 8- OH-DPAT na ingestão de água e NaCl 1,8%. Ratos Holtzman (280-320 g) foram submetidos ao implante de cânulas bilateralmente no NPV. Utilizando-se o bregma foram determinados os pontos de introdução das cânulas de aço inoxidável conforme as seguintes coordenadas: 1,8 mm caudal ao bregma, 0,6 mm lateral à linha mediana e 5,0 mm abaixo da dura-máter. Os seguintes resultados foram obtidos: Injeções de 5-HT (10, 20, 40 e 50 µg/ 0,2 µl) no NPV reduziram a ingestão de água (13,4±2,0; 12,6±1,3; 12,9±1,0 e 9,0±2,9 ml/ 30 min vs. sal: 18,4±0,8 ml/ 30 min, respectivamente, n = 6-8) e nas doses 10 e 20 µg/ 0,2 µl reduziram a ingestão de NaCl 1,8% (7,9±3,0 e 9,0±2,1 ml/ 30 min, respectivamente, vs. sal:17,7±1,8 ml/ 30 min, n = 7). Injeções de 8-OH-DPAT (1,0; 2,5 e 5,0 µg/ 0,2 µl) no NPV reduziram a ingestão de água (15,4±1,3; 14,8±1,2 e 14,2±0,9 ml/ 120 min, respectivamente, vs. sal: 19,1±1,0 ml/ 120 min, n=10) e nas doses de 2,5 µg e 5 µg reduziram também a ingestão de NaCl 1,8% (12,4±2,7 ml/ 60 min vs. sal: 19,3±1,0 ml/ 60 min; 12,2±1,8 ml/ 120 min vs. sal: 20,2±1,0 ml/ 120 min, respectivamente, n=9). Injeções bilaterais de pMPPF (antagonista 5- HT1A) prévias as injeções de 8-OH-DPAT bloquearam completamente o seu efeito inibitório sobre a ingestão de água (sal+DPAT: 13,8±1,1 ml/ 90 min vs. pMPPF+DPAT: 16,4±1,1 ml/ 90 min, n=12) e NaCl 1,8% (sal+DPAT: 11,4±2,9 ml/ 30 min vs. pMPPF+DPAT: 17,6±1,7 ml/ 30 min, n=8). O antagonista 5-HT1A reduziu parcialmente o efeito inibitório da 5-HT sobre a ingestão de água induzida por privação hídrica (sal+5-HT: 5,9±1,6 ml/ 30 min vs. pMPPF+5-HT: 12,3±1,1 ml/ 30 min, n=12) e sobre a ingestão de sódio induzida por depleção (sal+5-HT: 2,8±1,3 ml/ 30 min vs. pMPPF+5-HT: 12,3±1,9 ml/ 30 min, n=15). O antagonista pMPPF administrado isoladamente no NPV não alterou a ingestão de água e NaCl 1,8%. Esses resultados demonstram a existência de mecanismos serotoninérgicos no NPV do hipotálamo inibitórios da ingestão de água e sódio e a participação dos receptores 5-HT1A póssinápticos no controle da ingestão de água induzida por privação hídrica e ingestão de sódio induzida por depleção de sódio, e que este receptor não possui efeito inibitório tônico sobre estes comportamentos. Foi demonstrado também que outros subtipos de receptores serotoninérgicos do NPV do hipotálamo estão envolvidos no controle da dipsogênese e natriorexigênese.Universidade Federal de Minas Geraisapplication/pdfporUniversidade Federal de São CarlosPrograma Interinstitucional de Pós-Graduação em Ciências Fisiológicas - PIPGCFUFSCarBRNeurofisiologiaIngestão de água e sódioSerotoninaNúcleo paraventricular do hipotálamo5-HT1ACIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DE ORGAOS E SISTEMAS::NEUROFISIOLOGIAAtivação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódioinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1d161a9db-0e3c-4f66-8a91-068aa1ec7510info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDissPSV.pdfapplication/pdf824448https://repositorio.ufscar.br/bitstream/ufscar/1279/1/DissPSV.pdfef5a827f5cc75a41cb7ea788f8415605MD51THUMBNAILDissPSV.pdf.jpgDissPSV.pdf.jpgIM Thumbnailimage/jpeg7952https://repositorio.ufscar.br/bitstream/ufscar/1279/2/DissPSV.pdf.jpg862fd27f2ed69e0bf99078a9856ef857MD52ufscar/12792023-09-18 18:31:48.169oai:repositorio.ufscar.br:ufscar/1279Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:48Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
title |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
spellingShingle |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio Villa, Patrícia de Souza Neurofisiologia Ingestão de água e sódio Serotonina Núcleo paraventricular do hipotálamo 5-HT1A CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DE ORGAOS E SISTEMAS::NEUROFISIOLOGIA |
title_short |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
title_full |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
title_fullStr |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
title_full_unstemmed |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
title_sort |
Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio |
author |
Villa, Patrícia de Souza |
author_facet |
Villa, Patrícia de Souza |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/index.jsp |
dc.contributor.author.fl_str_mv |
Villa, Patrícia de Souza |
dc.contributor.advisor1.fl_str_mv |
Camargo, Luiz Antonio de Arruda |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4793576Z0 |
dc.contributor.authorID.fl_str_mv |
479a3617-e110-4fb5-926d-ca71356eb5bc |
contributor_str_mv |
Camargo, Luiz Antonio de Arruda |
dc.subject.por.fl_str_mv |
Neurofisiologia Ingestão de água e sódio Serotonina Núcleo paraventricular do hipotálamo 5-HT1A |
topic |
Neurofisiologia Ingestão de água e sódio Serotonina Núcleo paraventricular do hipotálamo 5-HT1A CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DE ORGAOS E SISTEMAS::NEUROFISIOLOGIA |
dc.subject.cnpq.fl_str_mv |
CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DE ORGAOS E SISTEMAS::NEUROFISIOLOGIA |
description |
Hypothalamic paraventricular nucleus (PVN) has an important role in the hydroeletrolytic balance and it also participates in the regulation of water and sodium intake. Recent researches described the presence of 5-HT1 receptors in the central nervous system, standing out the subtypes 5-HT1A, 5-HT1B, 5-HT1C and 5-HT1D. The receptor 5-HT1A was one of the firsts to be identified and it is found in the somatodendritic and pos-synaptic forms. It has been showed the participation of PVN 5-HT1A receptor in the hydroeletrolytic balance. Therefore, the aim of this study was: a) To investigate the effects of bilateral injections of serotonin (5-HT) in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; b) To investigate the effects of 8-OH-DPAT injection, an 5-HT1A agonist, in the PVN about water intake induced by water deprivation and water and 1.8% NaCl intake induced by sodium depletion; c) To investigate the action of pMPPF, an 5-HT1A antagonist, into the PVN on the effects of 5-HT and 8-OH-DPAT on the water and 1.8% NaCl intake. Holtzman rats (280-320 g) were submitted to the implant of cannulas bilaterally in the PVN. For the implant, the animals were adapted to a stereotaxic apparatus. Using the bregma, introduction points of the stainless steel cannulas were identified according to the coordinates: 1.8 mm caudal to bregma, 0.6 mm lateral to the midline and 5.0 mm below dura mater. 5-HT injections (10, 20, 40 and 50 µg/ 0,2 µl) in the PVN reduced the water intake (13.4±2.0; 12.6±1.3; 12.9±1.0 and 9.0±2.9 ml/ 30 min vs. sal: 18.4±0.8 ml/ 30 min, respectively, n = 6-8) and the doses 10 and 20 µg/ 0.2 µl reduced the 1.8% NaCl intake (7.9 ± 3.0 and 9.0 ± 2.1 ml/ 30 min, respectively, vs. sal: 17.7 ± 1.8 ml/ 30 min, n = 7). 8-OH-DPAT injections (1.0, 2.5 and 5.0 µg/ 0.2 µl) in the PVN reduced the water intake (15.4 ± 1.3; 14.8 ± 1.2 and 14.2 ± 0.9 ml/ 120 min vs. sal: 19.1 ± 1.0 ml/ 120 min, n = 10) and the doses 2.5 µg and 5 µg also reduced 1.8% NaCl intake (12.4 ± 2.7 ml/ 60 min vs. sal: 19.3 ± 1.0 ml/ 60 min; 12.2 ± 1.8 ml/ 120 min vs. sal: 20.0 ± 1.0 ml/ 120 min, respectively, n = 9). pMPPF bilateral injections (5-HT1A antagonist) preview to 8-OH-DPAT injections have completely blocked the inhibitory effect over water intake (sal + DPAT: 13.8 ± 1.1 ml/ 90 min vs. pMPPF + DPAT: 16.4 ± 1.1 ml/ 90 min, n = 12) and 1.8% NaCl (sal + DPAT: 11.4 ± 2.9 ml/ 30 min vs. pMPPF + DPAT: 17.6 ± 1.7 ml/ 30 min, n = 8). 5-HT1A antagonist partially reduced the inhibitory effect of 5-HT on water intake induced by water deprivation (sal+5-HT: 5.9±1.6 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.1 ml/ 30 min, n=12) as well as on sodium intake induced by sodium depletion (sal+5-HT: 2.8±1.3 ml/ 30 min vs. pMPPF+5-HT: 12.3±1.9 ml/ 30 min, n=15). Our results demonstrate the presence of serotonergic mechanisms in PVN inhibiting water and sodium intake and also the participation of pos-synaptic 5-HT1A receptors on water intake control induced by water deprivation and on sodium intake induced by sodium depletion, and that this receptor doesn t have a tonic inhibitory effect. This work also showed others subtypes serotonergic PVN receptors participating in the dipsogenesis and natriorexigenesis control. |
publishDate |
2006 |
dc.date.issued.fl_str_mv |
2006-04-20 |
dc.date.available.fl_str_mv |
2007-08-21 2016-06-02T19:22:46Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:22:46Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
VILLA, Patrícia de Souza. Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio.. 2006. 90 f. Dissertação (Mestrado em Ciências Biológicas) - Universidade Federal de São Carlos, São Carlos, 2006. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/1279 |
identifier_str_mv |
VILLA, Patrícia de Souza. Ativação do subtipo de receptor 5-HT1A do núcleo paraventricular do hipotálamo sobre a ingestão de água e sódio.. 2006. 90 f. Dissertação (Mestrado em Ciências Biológicas) - Universidade Federal de São Carlos, São Carlos, 2006. |
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https://repositorio.ufscar.br/handle/ufscar/1279 |
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Universidade Federal de São Carlos |
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Programa Interinstitucional de Pós-Graduação em Ciências Fisiológicas - PIPGCF |
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Universidade Federal de São Carlos |
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