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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nicotinic and muscarinic cholinergic receptors are recruited by acetylcholine-mediated neurotransmission within the locus coeruleus during the organisation of post-ictal antinociception

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Author(s):
de Oliveira, Rithiele Cristina ; de Oliveira, Ricardo ; Biagioni, Audrey Franceschi ; Falconi-Sobrinho, Luiz Luciano ; dos Anjos-Garcia, Tayllon ; Coimbra, Norberto Cysne
Total Authors: 6
Document type: Journal article
Source: Brain Research Bulletin; v. 127, p. 74-83, OCT 2016.
Web of Science Citations: 3
Abstract

Post-ictal antinociception is characterised by an increase in the nociceptive threshold that accompanies tonic and tonic-clonic seizures (TCS). The locus coeruleus (LC) receives profuse cholinergic inputs from the pedunculopontine tegmental nucleus. Different concentrations (1 mu g, 3 mu g and 5 mu g/0.2 mu L) of the muscarinic cholinergic receptor antagonist atropine and the nicotinic cholinergic receptor antagonist mecamylamine were microinjected into the LC of Wistar rats to investigate the role of cholinergic mechanisms in the severity of TCS and the post-ictal antinociceptive response. Five minutes later, TCS were induced by systemic administration of pentylenetetrazole (PTZ) (64 mg/kg). Seizures were recorded inside the open field apparatus for an average of 10 min. Immediately after seizures, the nociceptive threshold was recorded for 130 min using the tail-flick test. Pre-treatment of the LC with 1 mu g, 3 mu g and 5 mu g/0.2 mu L concentrations of both atropine and mecamylamine did not cause a significant effect on seizure severity. However, the same treatments decreased the post-ictal antinociceptive phenomenon. In addition, mecamylamine caused an earlier decrease in the post-ictal antinociception compared to atropine. These results suggest that muscarinic and mainly nicotinic cholinergic receptors of the LC are recruited to organise tonic-clonic seizure-induced antinociception. (C) 2016 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 09/00668-6 - Study of the involvement of cholinergic pathways form tegmentar pedunculopontine nucleus to monoaminergic nuclei of the pain endogenous inhibitory system in the post-ictal antinociception
Grantee:Norberto Cysne Coimbra
Support Opportunities: Regular Research Grants