Article (Scientific journals)
Vagus nerve stimulation in awake rats reduces formalin-induced nociceptive behaviour and fos-immunoreactivity in trigeminal nucleus caudalis
Bohotin, C.; Scholsem, M.; Multon, Sylvie et al.
2003In Pain, 101 (1-2), p. 3-12
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Keywords :
vagus nerve stimulation; formalin test; trigeminal nucleus caudalis; c-Fos; antinociception
Abstract :
[en] Besides its well-established efficacy in epilepsy, vagus nerve stimulation (VNS) may be of potential interest in pain treatment. It has, however, not yet been assessed in animal pain models with the devices and stimulation protocols used in humans. We have therefore studied in awake rats the effects of left cervical VNS on trigeminal nociception using an implantable electrode and stimulator (NCP-Cyberonics((R)). VNS was applied for 24 h at 2 mA intensity, 20 Hz frequency, 0.5 ms pulse width and a duty cycle of 20 s ON/18 s OFF. As a nociceptive stimulus, we injected formalin into the left mystacial vibrissae, assessed behaviour for 45 min and sacrificed the animals 45 min later. Fos-immunoreactive (Fos-Ir) neurons were counted in laminae I-II of trigeminal nucleus caudalis (TNC on both sides. We used three groups of control animals: VNS without formalin, formalin without VNS and sham VNS (implanted without stimulation or formalin). Whereas sham VNS had no significant effect, VNS alone increased Fos expression in ipsilateral TNC in addition to the expected increase in nucleus tractus solitarius. It also significantly attenuated the increase of Fos-Ir neurons observed in ipsilateral TNC laminae I-II after formalin injection. If the proper VNS effect on Fos-expression was subtracted, the reduction of formalin-induced nociceptor activation was 55%. VNS also reduced nociceptive behaviour on average by 96.1% during the early phase (0-6 min) and by 60.7% during the late phase (6-45 min) after the formalin injection. These results suggest that VNS applied with a device used in human therapy may have in awake rats a significant antinociceptive effect in a model of trigeminal pain. (C) 2002 International Association for the Study of Pain. Published by Elsevier Science B.V. All rights reserved.
Disciplines :
Surgery
Anesthesia & intensive care
Neurology
Neurosciences & behavior
Author, co-author :
Bohotin, C.
Scholsem, M.
Multon, Sylvie ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Neuro-anatomie
Martin, Didier  ;  Université de Liège - ULiège > Département des sciences cliniques > Neurochirurgie
Bohotin, V.
Schoenen, Jean  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Neuro-anatomie
Language :
English
Title :
Vagus nerve stimulation in awake rats reduces formalin-induced nociceptive behaviour and fos-immunoreactivity in trigeminal nucleus caudalis
Publication date :
January 2003
Journal title :
Pain
ISSN :
0304-3959
eISSN :
1872-6623
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
101
Issue :
1-2
Pages :
3-12
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 February 2009

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