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Objective validation of central sensitization in the rat UVB and heat rekindling model

Weerasinghe, N S, Lumb, B M, Apps, R, Koutsikou, Stella, Murrell, J C (2014) Objective validation of central sensitization in the rat UVB and heat rekindling model. European Journal of Pain, 18 (8). pp. 1199-1206. ISSN 1090-3801. E-ISSN 1532-2149. (doi:10.1002/j.1532-2149.2014.00469.x) (KAR id:84443)


Background: The UVB and heat rekindling (UVB/HR) model shows potential as a translatable inflammatory pain model. However, the occurrence of central sensitization in this model, a fundamental mechanism underlying chronic pain, has been debated. Face, construct and predictive validity are key requisites of animal models; electromyogram (EMG) recordings were utilized to objectively demonstrate validity of the rat UVB/HR model.

Methods: The UVB/HR model was induced on the heel of the hind paw under anaesthesia. Mechanical withdrawal thresholds (MWTs) were obtained from biceps femoris EMG responses to a gradually increasing pinch at the mid hind paw region under alfaxalone anaesthesia, 96 h after UVB irradiation. MWT was compared between UVB/HR and SHAM-treated rats (anaesthetic only). Underlying central mechanisms in the model were pharmacologically validated by MWT measurement following intrathecal N-methyl-d-aspartate (NMDA) receptor antagonist, MK-801, or saline.

Results: Secondary hyperalgesia was confirmed by a significantly lower pre-drug MWT {mean [±standard error of the mean (SEM)]} in UVB/HR [56.3 (±2.1) g/mm(2) , n = 15] compared with SHAM-treated rats [69.3 (±2.9) g/mm(2) , n = 8], confirming face validity of the model. Predictive validity was demonstrated by the attenuation of secondary hyperalgesia by MK-801, where mean (±SEM) MWT was significantly higher [77.2 (±5.9) g/mm(2) n = 7] in comparison with pre-drug [57.8 (±3.5) g/mm(2) n = 7] and saline [57.0 (±3.2) g/mm(2) n = 8] at peak drug effect. The occurrence of central sensitization confirmed construct validity of the UVB/HR model.

Conclusions: This study used objective outcome measures of secondary hyperalgesia to validate the rat UVB/HR model as a translational model of inflammatory pain.

Item Type: Article
DOI/Identification number: 10.1002/j.1532-2149.2014.00469.x
Subjects: Q Science > QP Physiology (Living systems)
R Medicine > RC Internal medicine > RC321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Divisions > Division of Natural Sciences > Medway School of Pharmacy
Depositing User: Stella Koutsikou
Date Deposited: 25 Nov 2020 12:16 UTC
Last Modified: 16 Feb 2021 14:16 UTC
Resource URI: (The current URI for this page, for reference purposes)

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