L-NOARG-induced catalepsy can be influenced by glutamatergic neurotransmission mediated by NMDA receptors in the inferior colliculus

L-NOARG-induced catalepsy can be influenced by glutamatergic neurotransmission mediated by NMDA receptors in the inferior colliculus

Author Iacopucci, A. P. Google Scholar
Mello, R. O. Google Scholar
Barbosa-Silva, R. Autor UNIFESP Google Scholar
Melo-Thomas, L. Autor UNIFESP Google Scholar
Institution Inst Neurociencias & Comportamento INEC
Univ Sao Francisco
Universidade Federal de São Paulo (UNIFESP)
Abstract The 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.
Keywords Inferior colliculus
Catalepsy
Glutamate
Nitric oxide
L-NOARG
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 2009/01437-8
Date 2012-10-01
Published in Behavioural Brain Research. Amsterdam: Elsevier B.V., v. 234, n. 2, p. 149-154, 2012.
ISSN 0166-4328 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 149-154
Origin http://dx.doi.org/10.1016/j.bbr.2012.06.022
Access rights Closed access
Type Article
Web of Science ID WOS:000308521300002
URI http://repositorio.unifesp.br/handle/11600/35363

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