Central serotonergic and adrenergic/imidazoline inhibitory mechanisms on sodium and water intake

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dc.contributor.authorMargatho, L. O.
dc.contributor.authorBarbosa, S. P.
dc.contributor.authorDe Luca, L. A.
dc.contributor.authorMenani, José Vanderlei [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:20:40Z
dc.date.available2014-05-20T15:20:40Z
dc.date.issued2002-11-22
dc.description.abstractRecent studies have shown the existence of two important inhibitory mechanisms for the control of NaCl and water intake: one mechanism involves serotonin in the lateral parabrachial nucleus (LPBN) and the other depends on alpha(2)-adrenergic/imidazoline receptors probably in the forebrain areas. In the present study we investigated if alpha(2)-adrenergic/imidazoline and serotonergic inhibitory mechanisms interact to control NaCl and water intake. Male Holtzman rats with cannulas implanted simultaneously into the lateral ventricle (LV) and bilaterally into the LPBN were used. The ingestion of 0.3 M NaCl and water was induced by treatment with the diuretic furosemide (10 mg/kg of body weight)+the angiotensin converting enzyme inhibitor captopril (5 mg/kg) injected subcutaneously 1 h before the access of rats to water and 0.3 M NaCl. Intracerebroventricular (i.c.v.) injection of the alpha(1)-adrenergic/imidazoline agonist clonidine (20 nmol/l RI) almost abolished water (1.6 +/- 1.2, vs. vehicle: 7.5 +/- 2.2 ml/2 h) and 0.3 M NaCl intake (0.5 +/- 0.3, vs. vehicle: 2.2 0.8 ml/2 h). Similar effects were produced by bilateral injections of the 5HT(2a/2b) serotonergic agonist 2,5-dimetoxy-4-iodoamphetamine (DOI, 5 mug/0.2 mul each site) into the LPBN on water (3.6 +/- 0.9 ml/2 h) and 0.3 M NaCl intake (0.4 +/- 0.2 m1/2 h). Injection of the (alpha(2)-adrenergic/imidazoline antagonist idazoxan (320 nmol) i.c.v. completely blocked the effects of clonidine on water (8.4 +/- 1.5 ml/2 h) and NaCl intake (4.0 +/- 1.2 ml/2 h), but did not change the effects of LPBN injections of DOI on water (4.2 +/- 1.0 ml/2 h) and NaCl intake (0.7 +/- 0.2 ml/2 h). Bilateral injections of methysergide (4 mug/0.2 mul each site) into the LPBN increased 0.3 M NaCl intake (6.4 +/- 1.9 ml/2 h), not water intake. The inhibitory effect of i.c.v. clonidine on water and 0.3 M NaCl was still present after injections of methysergide into the LPBN (1.5 +/- 0.8 and 1.7 +/- 1.4 ml/2 h, respectively). The results show that the inhibitory effects of the activation of a,-adrenergic/imidazoline receptors in the forebrain are still present after blockade of the LPBN serotonergic mechanisms and vice versa for the activation of serotonergic mechanisms of the LPBN. Therefore, each system may act independently to inhibit NaCl and water intake. (C) 2002 Elsevier B.V. B.V. All rights reserved.en
dc.description.affiliationPaulista State Univ, Sch Dent, Dept Physiol & Pathol, BR-14801903 Araraquara, SP, Brazil
dc.description.affiliationUnespPaulista State Univ, Sch Dent, Dept Physiol & Pathol, BR-14801903 Araraquara, SP, Brazil
dc.format.extent103-109
dc.identifierhttp://dx.doi.org/10.1016/S0006-8993(02)03486-8
dc.identifier.citationBrain Research. Amsterdam: Elsevier B.V., v. 956, n. 1, p. 103-109, 2002.
dc.identifier.doi10.1016/S0006-8993(02)03486-8
dc.identifier.issn0006-8993
dc.identifier.lattes1023597870118105
dc.identifier.urihttp://hdl.handle.net/11449/31917
dc.identifier.wosWOS:000179517200013
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofBrain Research
dc.relation.ispartofjcr3.125
dc.relation.ispartofsjr1,404
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsodium appetitept
dc.subjectserotoninpt
dc.subjectclonidinept
dc.subjectalpha(2)-adrenergic receptorpt
dc.subjectangiotensin IIpt
dc.titleCentral serotonergic and adrenergic/imidazoline inhibitory mechanisms on sodium and water intakeen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes1023597870118105
unesp.author.orcid0000-0001-8270-2652[3]
unesp.author.orcid0000-0003-1167-4441[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Odontologia, Araraquarapt

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