Ibotenate lesion of the medial hypothalamus alters the salt intake and pressor responses to activation of the median preoptic nucleus in rats

dc.contributor.authordoVale, C. F.
dc.contributor.authorCamargo, GMPA
dc.contributor.authorRenzi, Antonio [UNESP]
dc.contributor.authorLuiz, A. C.
dc.contributor.authorSaad, W. A.
dc.contributor.authorHetem, S.
dc.contributor.authorCamargo, LAA
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:22:09Z
dc.date.available2014-05-20T15:22:09Z
dc.date.issued1997-02-01
dc.description.abstractWe investigated the influence of ibotenic acid lesions of the medial hypothalamus (MH) on salt appetite and arterial blood pressure responses induced by angiotensinergic and adrenergic stimulation of the median preoptic nucleus (MnPO) of rats. Previous injection of the adrenergic agonists norepinephrine, clonidine, phenylephrine, and isoproterenol into the MnPO of sham MH-lesioned rats caused no change in the sodium intake induced by ANG II. ANG II injected into the MnPO of MH-lesioned rats increased sodium intake compared with sham-lesioned rats. Previous injection of clonidine and isoproterenol increased, whereas phenylephrine abolished the salt intake induced by ANG II into the MnPO of MH-lesioned rats. Previous injection of norepinephrine and clonidine into the MnPO of sham MH-lesioned rats caused no change in the mean arterial pressure (MAP) induced by ANG II. Under the same conditions, previous injection of phenylephrine increased, whereas isoproterenol reversed the increase in MAP induced by angiotensin II (ANG II). ANG II injected into the MnPO of MH-lesioned rats induce a decrease in MAP compared with sham-lesioned rats. Previous injection of phenylephrine or norepinephrine into the MnPO of MH-lesioned rats induced a negative MAP, whereas pretreatment with clonidine or isoproterenol increased the MAP produced by ANG II injected into the MnPO of sham- or MH-lesioned rats. These data show that ibotenic acid lesion of the MH increases the sodium intake and presser responses induced by the concomitant angiotensinergic, alpha(2) and beta adrenergic activation of the MnPO, whereas alpha(1) activation may have opposite effects. MH involvement in excitatory and inhibitory mechanisms related to sodium intake and MAP control is suggested.en
dc.description.affiliationPAULISTA STATE UNIV,UNESP,SCH DENT,DEPT PHYSIOL,BR-14801903 ARARAQUARA,SP,BRAZIL
dc.description.affiliationUnespPAULISTA STATE UNIV,UNESP,SCH DENT,DEPT PHYSIOL,BR-14801903 ARARAQUARA,SP,BRAZIL
dc.format.extent31-37
dc.identifierhttp://dx.doi.org/10.1016/S0928-4257(99)80163-6
dc.identifier.citationJournal of Physiology-paris. Paris: Editions Scientifiques Medicales Elsevier, v. 91, n. 1, p. 31-37, 1997.
dc.identifier.doi10.1016/S0928-4257(99)80163-6
dc.identifier.issn0928-4257
dc.identifier.lattes6551236936295697
dc.identifier.urihttp://hdl.handle.net/11449/33196
dc.identifier.wosWOS:A1997XB08900004
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal of Physiology-paris
dc.relation.ispartofsjr1,379
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectadrenergic agonistspt
dc.subjectmedial hypothalamuspt
dc.subjectangiotensin IIpt
dc.subjectarterial pressurept
dc.subjectsalt intakept
dc.titleIbotenate lesion of the medial hypothalamus alters the salt intake and pressor responses to activation of the median preoptic nucleus in ratsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes6551236936295697
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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