Amygdaloid involvement in the defensive behavior of mice exposed to the open elevated plus-maze

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dc.contributor.authorSorregotti, Tatiani [UNESP]
dc.contributor.authorCipriano, Ana Cláudia [UNESP]
dc.contributor.authorCruz, Fábio Cardoso
dc.contributor.authorMascarenhas, Diego Cardozo [UNESP]
dc.contributor.authorRodgers, Robert John
dc.contributor.authorNunes-de-Souza, Ricardo Luiz [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversity of Leeds
dc.date.accessioned2018-12-11T17:34:44Z
dc.date.available2018-12-11T17:34:44Z
dc.date.issued2018-02-15
dc.description.abstractPrevious studies have shown that the exposure to an open elevated plus maze (oEPM, an EPM with all four open arms) elicits fear/anxiety-related responses in laboratory rodents. However, very little is known about the underlying neural substrates of these defensive behaviors. Accordingly, the present study investigated the effects of chemical inactivation of the amygdala [through local injection of cobalt chloride (CoCl2: a nonspecific synaptic blocker)] on the behavior of oEPM-exposed mice. In a second experiment, the pattern of activation of the basolateral (BLA) and central (CeA) nuclei of the amygdala was assessed through quantification of Fos protein expression in mice subjected to one of several behavioral manipulations. To avoid the confound of acute handling stress, 4 independent groups of mice were habituated daily for 10 days to an enclosed EPM (eEPM) and, on day 11 prior to immunohistochemistry, were either taken directly from their home cage (control) or individually exposed for 10 min to a new clean holding cage (novelty), an eEPM, or the oEPM. An additional group of mice (maze-naïve) was not subjected to either the habituation or exposure phase but were simply chosen at random from their home cages to undergo an identical immunohistochemistry procedure. Results showed that amygdala inactivation produced an anxiolytic-like profile comprising reductions in time spent in the proximal portions of the open arms and total stretched attend postures (SAP) as well as increases in time spent in the distal portions of the open arms and total head-dipping. Moreover, Fos-positive labeled cells were bilaterally increased in the amygdaloid complex, particularly in the BLA, of oEPM-exposed animals compared to all other groups. These results suggest that the amygdala (in particular, its BLA nucleus) plays a key role in the modulation of defensive behaviors in oEPM-exposed mice.en
dc.description.affiliationJoint Graduate Program in Physiological Sciences UFSCar/UNESP
dc.description.affiliationPharmacology Laboratory of Neuropsychopharmacology School of Pharmaceutical Sciences Univ. Estadual Paulista UNESP
dc.description.affiliationDepartment of Pharmacology Federal University of São Paulo
dc.description.affiliationSchool of Psychology University of Leeds
dc.description.affiliationUnespJoint Graduate Program in Physiological Sciences UFSCar/UNESP
dc.description.affiliationUnespPharmacology Laboratory of Neuropsychopharmacology School of Pharmaceutical Sciences Univ. Estadual Paulista UNESP
dc.format.extent159-165
dc.identifierhttp://dx.doi.org/10.1016/j.bbr.2017.10.022
dc.identifier.citationBehavioural Brain Research, v. 338, p. 159-165.
dc.identifier.doi10.1016/j.bbr.2017.10.022
dc.identifier.file2-s2.0-85032901635.pdf
dc.identifier.issn1872-7549
dc.identifier.issn0166-4328
dc.identifier.scopus2-s2.0-85032901635
dc.identifier.urihttp://hdl.handle.net/11449/179332
dc.language.isoeng
dc.relation.ispartofBehavioural Brain Research
dc.relation.ispartofsjr1,413
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAmygdala
dc.subjectCobalt chloride
dc.subjectDefensive behavior
dc.subjectImmunohistochemistry
dc.subjectMice
dc.subjectOpen elevated plus maze
dc.titleAmygdaloid involvement in the defensive behavior of mice exposed to the open elevated plus-mazeen
dc.typeArtigo

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