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dc.contributor.authorIacopucci, Ana Paula
dc.contributor.authorMello, Rodrigo de Oliveira
dc.contributor.authorSilva, Regina Cláudia Barbosa da [UNIFESP]
dc.contributor.authorMelo-Thomas, Liana [UNIFESP]
dc.identifier.citationBehavioural Brain Research. Amsterdam: Elsevier B.V., v. 234, n. 2, p. 149-154, 2012.
dc.description.abstractThe inferior colliculus (IC), a midbrain structure that processes acoustic information of aversive nature, is distinguished from other auditory nuclei in the brainstem by its connections with structures of the motor system. Recent evidence relating the IC to motor behavior shows that glutamate-mediated mechanisms in the neural circuits at the IC level modulate haloperidol-induced catalepsy. It has been shown that N-G-nitro-L-arginine (L-NOARG), inhibitor of enzyme nitric oxide synthase (NOS), can induce catalepsy after intraperitoneal (ip), intracerebroventricular or intrastriatal administration. the present study examined whether the catalepsy induced by L-NOARG (ip) can be influenced by collicular glutamatergic mechanisms and if a NO-dependent neural substrate into the IC plays a role in this immobility state. L-NOARG-induced catalepsy was challenged with prior intracollicular microinjections of glutamate NMDA receptor antagonists, AP7 (20 or 40 nmo1/0.5 mu l), or of the NMDA receptor agonist N-methyl-D-aspartate (NMDA, 30 nmo1/0.5 mu l). Catalepsy was evaluated by positioning both forepaws of the rats on an elevated horizontal wooden bar and recording the time for which the animal maintained this position. the results showed that intracollicular microinjection of AP7 previous to systemic injections of L-NOARG (90 mg/kg) significantly attenuated the catalepsy. Conversely, intracollicular microinjection of NMDA increased the time of catalepsy when administered 10 min before systemic L-NOARG (10 or 45 mg/kg). the microinjection of L-NOARG (50 or 100 nmol) directly into the IC was not able to induce catalepsy. These findings suggest that glutamate-mediated mechanisms in the neural circuits of the IC modulate L-NOARG-induced catalepsy and participate in the regulation of motor activity. (C) 2012 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt
dc.publisherElsevier B.V.
dc.relation.ispartofBehavioural Brain Research
dc.rightsAcesso restrito
dc.subjectInferior colliculusen
dc.subjectNitric oxideen
dc.titleL-NOARG-induced catalepsy can be influenced by glutamatergic neurotransmission mediated by NMDA receptors in the inferior colliculusen
dc.contributor.institutionInst Neurociencias & Comportamento INEC
dc.contributor.institutionUniv Sao Francisco
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.description.affiliationInst Neurociencias & Comportamento INEC, BR-14040901 Ribeirao Preto, SP, Brazil
dc.description.affiliationUniv Sao Francisco, Lab Neuropsicofarmacol, BR-12916900 Braganca Paulista, SP, Brazil
dc.description.affiliationUniversidade Federal de São Paulo, Dept Biociencias, BR-11060001 Santos, SP, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Dept Biociencias, BR-11060001 Santos, SP, Brazil
dc.description.sponsorshipIDFAPESP: 2009/01437-8pt
dc.description.sourceWeb of Science

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