AV3V lesions reduce the pressor response to L-glutamate into the RVLM

Página do item simplificado
dc.contributor.authorVieira, A. A.
dc.contributor.authorColombari, E.
dc.contributor.authorDe Luca, L. A.
dc.contributor.authorColombari, DSD
dc.contributor.authorMenani, J. V.
dc.contributor.institutionPaulista State Univ
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T12:41:09Z
dc.date.available2016-01-24T12:41:09Z
dc.date.issued2006-05-01
dc.description.abstractNeurons from the rostral ventrolateral medulla (RVLM) directly activate sympathetic preganglionic neurons in the spinal cord. Hypertensive responses and sympathetic activation produced by different stimuli are strongly affected by lesions of the preoptic periventricular tissue surrounding the anteroventral third ventricle (AV3V region). Therefore, in the present study, we investigated the effects of acute (1 day) and chronic (IS days) electrolytic lesions of the AV3V region on the pressor responses produced by injections of the excitatory amino acid L-glutamate into the RVLM of unanesthetized rats. Male Holtzman rats with sham or electrolytic AV3V lesions and a stainless steel cannula. implanted into the RVLM were used. the pressor responses produced by injections of L-glutamate (1, 5 and 10 nmol/100 nl) into the RVLM were reduced 1 day (9 +/- 4, 39 +/- 6 and 37 +/- 4 mm Hg, respectively) and 15 days after AV3V lesions (13 +/- 6, 39 +/- 4 and 43 +/- 4 mm Hg, respectively, vs. sham lesions: 29 +/- 3, 50 +/- 2 and 58 +/- 3 mm Hg, respectively). Injections of L-glutamate into the RVLM in sham or AV3V-lesioned rats produced no significant change in the heart rate (HR). Baroreflex bradycardia and tachycardia produced by iv phenylephrine or sodium nitroprusside, respectively, and the pressor and bradycardic responses to chemoreflex activation with iv potassium cyanide were not modified by AV3V lesions. the results suggest that signals from the AV3V region are important for sympathetic activation induced by L-glutamate into the RVLM. (c) 2006 Elsevier B.V. All rights reserved.en
dc.description.affiliationPaulista State Univ, UNESP, Sch Dent, Dept Physiol & Pathol, Araraquara, SP, Brazil
dc.description.affiliationUNIFESPEPM, Dept Physiol, São Paulo, SP, Brazil
dc.description.affiliationUnifespUNIFESPEPM, Dept Physiol, São Paulo, SP, Brazil
dc.description.sourceWeb of Science
dc.format.extent160-167
dc.identifierhttp://dx.doi.org/10.1016/j.brainres.2006.02.074
dc.identifier.citationBrain Research. Amsterdam: Elsevier B.V., v. 1086, p. 160-167, 2006.
dc.identifier.doi10.1016/j.brainres.2006.02.074
dc.identifier.issn0006-8993
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/28882
dc.identifier.wosWOS:000238001500019
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofBrain Research
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.subjectsympatheticen
dc.subjectrostral ventrolateral medullaen
dc.subjecthypothalamusen
dc.subjecthypertensionen
dc.subjectcircumventricular organen
dc.titleAV3V lesions reduce the pressor response to L-glutamate into the RVLMen
dc.typeinfo:eu-repo/semantics/article
Arquivos
Coleções
EPM - Artigos