Publication
Title
Behavioral study of non-evoked orofacial pain following different types of infraorbital nerve injury in rats
Author
Abstract
Directed isolated face grooming following unilateral chronic constriction injury to the infraorbital nerve (IoN-CCI) is a unique measure of spontaneous neuropathic pain. Variability between rats and the limited duration of the increased face grooming behavior has hampered its usefulness. We studied three possible sources of variability: variations in surgery, pre-existing differences in nocifensive behavior between the rats and variation in time. Three different types of IoN lesion were performed: loose ligation (CCI), tight ligation (CCI-T) and partial tight ligation (PTL, Seltzer Method); the latter two offer greater surgical standardization. Face grooming behavior following IoN injury, on the one hand, and during the orofacial formalin test, on the other hand, was analyzed and correlated. Significant differences in isolated face grooming behavior were found between the IoN groups. Interestingly, CCI-T rats continued to show significantly increased isolated face grooming for the duration of the experiment, i.e., up to 32 days post-operative, whereas CCI animals were no longer significantly different from sham animals after two weeks. Surprisingly, PTL. operated rats only showed minor effects. Variability was not smaller in the CCI-T or PTL group. Face grooming behavior after IoN lesion was poorly correlated to that in the orofacial formalin test. It is therefore unclear if pre-existing behavioral differences between animals are a major cause of variability in the IoN-CCI model. Finally, repeated testing showed significant variability in time. It is concluded that tight ligation of the IoN nerve has long-lasting effects on face grooming behavior and that part of the variability in face grooming behavior may be reduced by performing repeated testing. (C) 2014 Elsevier Inc. All rights reserved.
Language
English
Source (journal)
Physiology and behavior. - Oxford
Publication
Oxford : 2015
ISSN
0031-9384
Volume/pages
138(2015), p. 292-296
ISI
000348882900041
Full text (Publishers DOI)
Full text (publishers version - intranet only)
UAntwerpen
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 13.03.2015
Last edited 10.05.2017
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