Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/8808 |
Resumo: | Within the hypothalamic areas involved in the control of cardiovascular function, neurons of the paraventricular hypothalamus play a key role, either by projecting to the sympathetic premotor neurons of rostroventrolateral medulla (RVLM) or by reaching preganglionic neurons of the spinal intermediolateral column (IML). Despite describing the role of PVH in the cardiovascular control, literature lacks of data on the PVH contribution to the control of cardiac function. In this regard, the aim of the present study was to assess whether gabaergic and adrenergic synapses, known for being active at the PVH, are involved in the control of cardiac function by its neurons in normotensive anesthetized animals. Experiments were performed in adult male Wistar rats (250-350g) that were anesthetized with urethane (1.2-1.4 g/kg i.p.) and underwent catheterization of femoral to record arterial pressure and heart rate. Femoral vein was used to inject the vasoactive drugs phenylephrine (10μg/kg) the sodium nitroprussiate (10μg/kg), the blocker of cardiac pacemaker zatebradine (1mg/kg) and to supplement anesthesia. The cardiac left ventricle was catheterized to record the left ventricular pressure and its derivative. Craniotomy allowed for injections into the PVH of: muscimol (20mM – 100nL), bicuculline (0,4mM - 100nL), propranolol (10mM – 100nL), isoproterenol (100μM – 100nL), fentolamine (13mM – 100nL), phenylephrine (30nM – 100nL). The main results were: i) inhibition of PVH by injecting GABAA agonist muscimol, reduced arterial pressure and cardiac inotropy; ii) disihibition of PVH neurons by injecting bicuculline evoked positive chronotropy and inotropy; iii) Alfa adrenergic receptors control cardiac function; iv) Beta adrenergic receptors of PVH do not influence cardiac function; v) afterload seems to poorly contribute to the PVH-evoked inotropy. Jointly, our results suggest that PVH provides substantial contribution to the tonic control of cardiac function. We conclude that the PVH participates in the control of cardiac function. Changes in the activity of these neurons by gabaergic and adrenergic influences may set autonomic control of cardiac function, thus resulting in contractile and heartbeat responses. Deepen the knowledge on the mechanisms underlying the control of central areas and its influence on the cardiovascular system may feed the understanding of cardiovascular pathophysiology. |
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Custódio, Carlos Henrique Xavierhttp://lattes.cnpq.br/0207928273284808Colugnati, Diego Basilehttp://lattes.cnpq.br/3875833705952056Custódio, Carlos Henrique XavierPobbe, Roger Luís HenschelCosta, Renata Mazaro ehttp://lattes.cnpq.br/1560851626420369Mendonça, Michelle Mendanha2018-08-17T11:31:06Z2017-07-25MENDONÇA, Michelle Mendanha. Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca. 2017. 87 f. Dissertação (Mestrado em Biologia) - Universidade Federal de Goiás, Goiânia, 2017.http://repositorio.bc.ufg.br/tede/handle/tede/8808Within the hypothalamic areas involved in the control of cardiovascular function, neurons of the paraventricular hypothalamus play a key role, either by projecting to the sympathetic premotor neurons of rostroventrolateral medulla (RVLM) or by reaching preganglionic neurons of the spinal intermediolateral column (IML). Despite describing the role of PVH in the cardiovascular control, literature lacks of data on the PVH contribution to the control of cardiac function. In this regard, the aim of the present study was to assess whether gabaergic and adrenergic synapses, known for being active at the PVH, are involved in the control of cardiac function by its neurons in normotensive anesthetized animals. Experiments were performed in adult male Wistar rats (250-350g) that were anesthetized with urethane (1.2-1.4 g/kg i.p.) and underwent catheterization of femoral to record arterial pressure and heart rate. Femoral vein was used to inject the vasoactive drugs phenylephrine (10μg/kg) the sodium nitroprussiate (10μg/kg), the blocker of cardiac pacemaker zatebradine (1mg/kg) and to supplement anesthesia. The cardiac left ventricle was catheterized to record the left ventricular pressure and its derivative. Craniotomy allowed for injections into the PVH of: muscimol (20mM – 100nL), bicuculline (0,4mM - 100nL), propranolol (10mM – 100nL), isoproterenol (100μM – 100nL), fentolamine (13mM – 100nL), phenylephrine (30nM – 100nL). The main results were: i) inhibition of PVH by injecting GABAA agonist muscimol, reduced arterial pressure and cardiac inotropy; ii) disihibition of PVH neurons by injecting bicuculline evoked positive chronotropy and inotropy; iii) Alfa adrenergic receptors control cardiac function; iv) Beta adrenergic receptors of PVH do not influence cardiac function; v) afterload seems to poorly contribute to the PVH-evoked inotropy. Jointly, our results suggest that PVH provides substantial contribution to the tonic control of cardiac function. We conclude that the PVH participates in the control of cardiac function. Changes in the activity of these neurons by gabaergic and adrenergic influences may set autonomic control of cardiac function, thus resulting in contractile and heartbeat responses. Deepen the knowledge on the mechanisms underlying the control of central areas and its influence on the cardiovascular system may feed the understanding of cardiovascular pathophysiology.Dentre as áreas hipotalâmicas envolvidas no controle da função cardiovascular, os neurônios do hipotálamo paraventicular (PVH) desempenham um papel fundamental no controle da função cardíaca por meio de suas projeções para neurônios pré-motores simpáticos do bulbo rostroventrolateral (RVLM) pelas projeções diretas que alcançam os neurônios pré-ganglionares da coluna intermediolateral espinhal (IML). Contudo, não há dados na literatura sobre sua contribuição para o controle da função cardíaca em animais normotensos e anestesiados. Sendo assim, o objetivo do presente estudo foi avaliar se as sinapses gabaérgicas e adrenérgicas, presentes no PVH, estão envolvidas no controle da função cardíaca por esses neurônios. Os experimentos foram realizados em ratos Wistar machos (250-350g), que foram anestesiados com uretana (1,2 a 1,4 g / kg i.p.) e tiveram sua artéria femoral canulada para registrar pressão arterial e frequência cardíaca. A veia femoral foi utilizada para injeções de fármacos vasoativos fenilefrina (10μg/kg) e nitroprussitato de sódio (10μg/kg), do bloqueador do marcapasso cardíaco zatebradina (1mg/kg) e para suplementação de anestesia. O ventrículo esquerdo cardíaco foi cateterizado para medir a pressão ventricular esquerda e sua derivativa. A craniotomia foi realizada para permitir injeções no PVH de: muscimol (20mM – 100nL), bicucullina (0,4mM - 100nL), propranolol (10mM – 100nL), isoproterenol (100μM – 100nL), fentolamina (13mM – 100nL), fenilefrina (30nM – 100nL). Os principais achados deste estudo são: i) A inibição dos neurônios do PVH pela injeção do agonista GABAA muscimol reduziu a pressão arterial e o inotropismo cardíaco; ii) A desinibição dos neurônios do PVH pela injeção de bicuculina provocou respostas cronotrópicas e inotrópicas positivas; iii) Os receptores α-adrenérgicos contribuem para o cronotropismo e inotropismo cardíacos; iv) Os receptores β- adrenérgicos do PVH não influenciam o controle da função cardíaca; v) A pós-carga exerceu pouca influência nas respostas inotrópicas controladas pelo PVH. Em conjunto, os resultados sugerem que o PVH contribui de forma relevante para o controle tônico da função cardíaca em animais normotensos e anestesiados. Assim conclui-se que o PVH participa do controle da função cardíaca.Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2018-08-16T17:44:08Z No. of bitstreams: 2 Dissertação - Michelle Mendanha Mendonça - 2017.pdf: 20722346 bytes, checksum: 2ee7a850badae565954ebdb18346c83d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-08-17T11:31:06Z (GMT) No. of bitstreams: 2 Dissertação - Michelle Mendanha Mendonça - 2017.pdf: 20722346 bytes, checksum: 2ee7a850badae565954ebdb18346c83d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)Made available in DSpace on 2018-08-17T11:31:06Z (GMT). No. of bitstreams: 2 Dissertação - Michelle Mendanha Mendonça - 2017.pdf: 20722346 bytes, checksum: 2ee7a850badae565954ebdb18346c83d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-07-25Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqapplication/pdfporUniversidade Federal de GoiásPrograma de Pós-graduação em Biologia (ICB)UFGBrasilInstituto de Ciências Biológicas - ICB (RG)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessContratilidade cardíacaSistema nervoso autônomoSinapses gabaérgicasSinapses adrenérgicasCardiac contractilityGabaergic synapsesAdrenergic synapsesCIENCIAS BIOLOGICAS::BIOLOGIA GERALContribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíacaRole of paraventricular hypothalamus in the control of cardiac functioninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis6883982777473437920600600600600-3872772117827373404-1634559385931244697-2555911436985713659reponame:Repositório Institucional da UFGinstname:Universidade Federal de Goiás (UFG)instacron:UFGLICENSElicense.txtlicense.txttext/plain; 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dc.title.eng.fl_str_mv |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
dc.title.alternative.eng.fl_str_mv |
Role of paraventricular hypothalamus in the control of cardiac function |
title |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
spellingShingle |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca Mendonça, Michelle Mendanha Contratilidade cardíaca Sistema nervoso autônomo Sinapses gabaérgicas Sinapses adrenérgicas Cardiac contractility Gabaergic synapses Adrenergic synapses CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
title_short |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
title_full |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
title_fullStr |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
title_full_unstemmed |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
title_sort |
Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca |
author |
Mendonça, Michelle Mendanha |
author_facet |
Mendonça, Michelle Mendanha |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Custódio, Carlos Henrique Xavier |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0207928273284808 |
dc.contributor.advisor-co1.fl_str_mv |
Colugnati, Diego Basile |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/3875833705952056 |
dc.contributor.referee1.fl_str_mv |
Custódio, Carlos Henrique Xavier |
dc.contributor.referee2.fl_str_mv |
Pobbe, Roger Luís Henschel |
dc.contributor.referee3.fl_str_mv |
Costa, Renata Mazaro e |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/1560851626420369 |
dc.contributor.author.fl_str_mv |
Mendonça, Michelle Mendanha |
contributor_str_mv |
Custódio, Carlos Henrique Xavier Colugnati, Diego Basile Custódio, Carlos Henrique Xavier Pobbe, Roger Luís Henschel Costa, Renata Mazaro e |
dc.subject.por.fl_str_mv |
Contratilidade cardíaca Sistema nervoso autônomo Sinapses gabaérgicas Sinapses adrenérgicas |
topic |
Contratilidade cardíaca Sistema nervoso autônomo Sinapses gabaérgicas Sinapses adrenérgicas Cardiac contractility Gabaergic synapses Adrenergic synapses CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
dc.subject.eng.fl_str_mv |
Cardiac contractility Gabaergic synapses Adrenergic synapses |
dc.subject.cnpq.fl_str_mv |
CIENCIAS BIOLOGICAS::BIOLOGIA GERAL |
description |
Within the hypothalamic areas involved in the control of cardiovascular function, neurons of the paraventricular hypothalamus play a key role, either by projecting to the sympathetic premotor neurons of rostroventrolateral medulla (RVLM) or by reaching preganglionic neurons of the spinal intermediolateral column (IML). Despite describing the role of PVH in the cardiovascular control, literature lacks of data on the PVH contribution to the control of cardiac function. In this regard, the aim of the present study was to assess whether gabaergic and adrenergic synapses, known for being active at the PVH, are involved in the control of cardiac function by its neurons in normotensive anesthetized animals. Experiments were performed in adult male Wistar rats (250-350g) that were anesthetized with urethane (1.2-1.4 g/kg i.p.) and underwent catheterization of femoral to record arterial pressure and heart rate. Femoral vein was used to inject the vasoactive drugs phenylephrine (10μg/kg) the sodium nitroprussiate (10μg/kg), the blocker of cardiac pacemaker zatebradine (1mg/kg) and to supplement anesthesia. The cardiac left ventricle was catheterized to record the left ventricular pressure and its derivative. Craniotomy allowed for injections into the PVH of: muscimol (20mM – 100nL), bicuculline (0,4mM - 100nL), propranolol (10mM – 100nL), isoproterenol (100μM – 100nL), fentolamine (13mM – 100nL), phenylephrine (30nM – 100nL). The main results were: i) inhibition of PVH by injecting GABAA agonist muscimol, reduced arterial pressure and cardiac inotropy; ii) disihibition of PVH neurons by injecting bicuculline evoked positive chronotropy and inotropy; iii) Alfa adrenergic receptors control cardiac function; iv) Beta adrenergic receptors of PVH do not influence cardiac function; v) afterload seems to poorly contribute to the PVH-evoked inotropy. Jointly, our results suggest that PVH provides substantial contribution to the tonic control of cardiac function. We conclude that the PVH participates in the control of cardiac function. Changes in the activity of these neurons by gabaergic and adrenergic influences may set autonomic control of cardiac function, thus resulting in contractile and heartbeat responses. Deepen the knowledge on the mechanisms underlying the control of central areas and its influence on the cardiovascular system may feed the understanding of cardiovascular pathophysiology. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017-07-25 |
dc.date.accessioned.fl_str_mv |
2018-08-17T11:31:06Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MENDONÇA, Michelle Mendanha. Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca. 2017. 87 f. Dissertação (Mestrado em Biologia) - Universidade Federal de Goiás, Goiânia, 2017. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/8808 |
identifier_str_mv |
MENDONÇA, Michelle Mendanha. Contribuição de diferentes sinapses do hipotálamo paraventricular para o controle da função cardíaca. 2017. 87 f. Dissertação (Mestrado em Biologia) - Universidade Federal de Goiás, Goiânia, 2017. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/8808 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
6883982777473437920 |
dc.relation.confidence.fl_str_mv |
600 600 600 600 |
dc.relation.department.fl_str_mv |
-3872772117827373404 |
dc.relation.cnpq.fl_str_mv |
-1634559385931244697 |
dc.relation.sponsorship.fl_str_mv |
-2555911436985713659 |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.publisher.program.fl_str_mv |
Programa de Pós-graduação em Biologia (ICB) |
dc.publisher.initials.fl_str_mv |
UFG |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Instituto de Ciências Biológicas - ICB (RG) |
publisher.none.fl_str_mv |
Universidade Federal de Goiás |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFG instname:Universidade Federal de Goiás (UFG) instacron:UFG |
instname_str |
Universidade Federal de Goiás (UFG) |
instacron_str |
UFG |
institution |
UFG |
reponame_str |
Repositório Institucional da UFG |
collection |
Repositório Institucional da UFG |
bitstream.url.fl_str_mv |
http://repositorio.bc.ufg.br/tede/bitstreams/eca0e9a6-873f-4591-849b-71c40cb60edd/download http://repositorio.bc.ufg.br/tede/bitstreams/374b9657-695a-49ff-b76e-43039f5325cf/download http://repositorio.bc.ufg.br/tede/bitstreams/2e4c4351-1eb5-429d-a01b-5f4301b35061/download http://repositorio.bc.ufg.br/tede/bitstreams/ab638071-7a71-4b06-88d3-d30300427e1d/download http://repositorio.bc.ufg.br/tede/bitstreams/1fc23465-0430-4f70-a82a-e12bc9fe21d8/download |
bitstream.checksum.fl_str_mv |
bd3efa91386c1718a7f26a329fdcb468 4afdbb8c545fd630ea7db775da747b2f d41d8cd98f00b204e9800998ecf8427e d41d8cd98f00b204e9800998ecf8427e 2ee7a850badae565954ebdb18346c83d |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFG - Universidade Federal de Goiás (UFG) |
repository.mail.fl_str_mv |
tasesdissertacoes.bc@ufg.br |
_version_ |
1798044383638978560 |