Botulinum toxin type-A effect as a preemptive treatment in a model of acute trigeminal pain: a pre-clinical double-blind and placebo-controlled study

The purpose of this study was to investigate if botulinum neurotoxin type-A (BoNT/A) had a preemptive antinociceptive effect in a formalin-induced orofacial pain model (FT). To test this hypothesis, male Rattus norvegicus were injected with isotonic saline solution 0.9% or BoNT/A administered as a 40 μl bolus, lateral to their nose, at 24 hours, 8, 15, 22, 29 or 36 days pre-FT. The procedures were repeated 42 days later. Influence on motor activity was assessed through the open-field test. Pain scores corresponded to the time spent rubbing and flicking the injected area. Animals pre-treated with BoNT/A at the first protocol (8 days subgroup) showed reduced inflammatory scores (p=0.011). For the other groups no significant results were observed at any phase. Motor activity was similar in both groups. BoNT/A showed to be effective preventing inflammatory pain up to eight days after the first treatment, an effect not reproduced on the second dose administration.

Bibliographic Details

Main Authors:	Piovesan,Elcio Juliato, Leite,Lucas da Silva, Teive,Helio Ghizoni, Kowacs,Pedro André, Mulinari,Rogério Andrade, Radunz,Victor, Utiumi,Marco, Campos,Helder Groenwold, Werneck,Lineu Cesar
Format:	Digital revista
Language:	English
Published:	Academia Brasileira de Neurologia - ABNEURO 2011
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2011000100012
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