Characterization of nociceptive behavioural responses in the awake pig following UV–B-induced inflammation
Article first published online: 29 MAY 2013
© 2013 European Pain Federation - EFIC®
European Journal of Pain
Volume 18, Issue 1, pages 20–28, January 2014
How to Cite
Di Giminiani, P., Petersen, L.J. and Herskin, M.S. (2014), Characterization of nociceptive behavioural responses in the awake pig following UV–B-induced inflammation. European Journal of Pain, 18: 20–28. doi: 10.1002/j.1532-2149.2013.00340.x
This work has been financed by a grant from Aarhus University, Faculty of Agricultural Sciences, and the Danish Agency for Science, Technology and Innovation.
Conflicts of interest
- Issue published online: 9 DEC 2013
- Article first published online: 29 MAY 2013
- Manuscript Accepted: 3 MAY 2013
- Aarhus University, Faculty of Agricultural Sciences
- Danish Agency for Science, Technology and Innovation
Among the current translational inflammatory pain models, the ultraviolet (UV) irradiation is of rapidly growing interest. The development of primary thermal and mechanical hyperalgesia has been observed in humans and rodents. The pig as a translational animal model might be advantageous due to its great homology with humans.
The skin in the flank of awake pigs was irradiated by a UV-B light source (1 J/cm2) and changes in thermal and mechanical sensitivity 24 and 48 h following irradiation were measured via assessment of nociceptive behaviours.
Thermal sensitivity increased significantly within the inflamed site 24 h after irradiation as indicated by the reduction of latency to respond to thermal stimulation from baseline to 24 h (P < 0.05). At 48 h, the response latency had not decreased any further (P = 0.414). Thermal sensitivity was also higher at the inflamed skin site than at the control site 24 and 48 h following irradiation (P < 0.05). An overall decrease of 50% of the baseline mechanical threshold was observed 24 and 48 h following UV-B irradiation (P = 0.092). Following the inflammatory challenge, the mechanical sensitivity was higher at the site of irradiation compared with the control skin at both 24 and 48 h (P < 0.05).
Our study shows that behavioural recordings are a valid tool for the assessment of thermal hyperalgesia following UV-B inflammation in porcine skin, but they were not capable of providing a clear indication of the development of mechanical hyperalgesia.