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dc.contributor.authorMoreira, Thiago S.
dc.contributor.authorTakakura, Ana C. [UNESP]
dc.contributor.authorColombari, Eduardo [UNESP]
dc.date.accessioned2014-05-20T13:46:05Z
dc.date.available2014-05-20T13:46:05Z
dc.date.issued2011-01-20
dc.identifierhttp://dx.doi.org/10.1016/j.autneu.2010.08.003
dc.identifier.citationAutonomic Neuroscience-basic & Clinical. Amsterdam: Elsevier B.V., v. 159, n. 1-2, p. 62-70, 2011.
dc.identifier.issn1566-0702
dc.identifier.urihttp://hdl.handle.net/11449/16276
dc.description.abstractInhibitory neurotransmission has an important role in the processing of sensory afferent signals in the nucleus of the solitary tract (NTS), particularly in spontaneously hypertensive rats (SHR). In the present study, we tested the hypothesis that gamma-aminobutyric acid (GABA) mediated neurotransmission within the NTS produces an inhibition of the baroreflex response of splanchnic sympathetic nerve discharge (sSND). In urethane-anesthetized, artificially ventilated and vagotomized male SHR and Wistar Kyoto (WKY) rats we compared baroreflex-response curves evoked after bilateral injections into the NTS of the GABA-A antagonist bicuculline (25 pmol/50 nl) or the GABA-B antagonist CGP 35348 (5 nmol/50 nl). Baseline MAP in SHR was higher than the WKY rats (SHR: 153+/-5, vs. WKY: 112+/-6 mm Hg, p<0.05). Bilateral injection of bicuculline or CGP 35348 into the NTS induced a transient (5 min) reduction in MAP (Delta = -26+/-4 and -41+/-6 mm Hg, respectively vs. saline Delta = +4+/-3 mm Hg, p<0.05) and sSND (Delta = -21+/-13 and -78+/-7%, respectively vs. saline: Delta = +6+/-4% p<0.05). Analysis of the baroreceptor curve revealed a decrease in the lower plateau (43+/-11 and 15+/-5%, respectively vs. saline: 78+/-6%, p<0.05) and an increase in the sympathetic gain of baroreflex (6.3+/-0.3, 7.2+/-0.8% respectively vs. saline: 4.2+/-0.4%, p<0.05). Bicuculline or CGP35348 into the NTS in WKY rats did not change MAP, sSND and sympathetic baroreflex gain. These data indicate that GABAergic mechanisms within the NTS act tonically reducing sympathetic baroreflex gain in SHR. Crown Copyright (C) 2010 Published by Elsevier By. All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipNEPAS/FMABC
dc.format.extent62-70
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofAutonomic Neuroscience-basic & Clinical
dc.sourceWeb of Science
dc.subjectNucleus of the solitary tracten
dc.subjectBaroreflexen
dc.subjectSympathetic activityen
dc.subjectSHRen
dc.subjectGABA receptorsen
dc.titleImportant GABAergic mechanism within the NTS and the control of sympathetic baroreflex in SHRen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionABC
dc.description.affiliationUniv São Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508900 São Paulo, Brazil
dc.description.affiliationSão Paulo State Univ UNESP, Sch Dent, Dept Physiol & Pathol, BR-14801903 Araraquara, SP, Brazil
dc.description.affiliationFed Univ São Paulo UNIFESP, Sch Med, Dept Physiol, BR-04023060 São Paulo, Brazil
dc.description.affiliationABC, Sch Med, Dept Physiol, BR-09060870 Santo Andre, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ UNESP, Sch Dent, Dept Physiol & Pathol, BR-14801903 Araraquara, SP, Brazil
dc.identifier.doi10.1016/j.autneu.2010.08.003
dc.identifier.wosWOS:000286299700009
dc.rights.accessRightsAcesso restrito
dc.description.sponsorshipIdFAPESP: 08/57388-2
dc.description.sponsorshipIdFAPESP: 06/60174-9
dc.description.sponsorshipIdCNPq: 501971/2007-6
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt
dc.identifier.lattes4544450092427426
unesp.author.lattes4544450092427426[3]
unesp.author.orcid0000-0002-1395-4036[3]
dc.relation.ispartofjcr2.605
dc.relation.ispartofsjr0,902
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