Ongoing pain in the MIA model of osteoarthritis.

Abstract

Osteoarthritis (OA) is a chronic pain condition characterized by pain during joint use as well as pain at rest (i.e., ongoing pain). Although injection of monosodium iodoacetate (MIA) into the intra-articular space of the rodent knee is a well established model of OA pain that is characterized by changes in weight bearing and hypersensitivity to tactile and thermal stimuli, it is not known if this procedure elicits ongoing pain. Further, the time-course and possible underlying mechanisms of these components of pain remain poorly understood. In these studies, we demonstrated the presence of ongoing pain in addition to changes in weight bearing and evoked hypersensitivity. Twenty-eight days following MIA injection, spinal clonidine blocked changes in weight bearing and thermal hypersensitivity and produced place preference indicating that MIA induces ongoing and evoked pain. These findings demonstrate the presence of ongoing pain in this model that is present at a late-time point after MIA allowing for mechanistic investigation.

• Authors: Ping Liu, Alec Okun, Jiyang Ren, Rui-chen Guo, Michael H Ossipov, Jennifer Xie, Tamara King, Frank Porreca
• Journal: Neuroscience letters (Neurosci Lett) Vol. 493 Issue 3 Pg. 72-5 (Apr 15 2011) ISSN: 1872-7972 [Electronic] Ireland
• PMID: 21241772 (Publication Type: Comparative Study, Journal Article)
• Copyright: Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

Chemical References

• Iodoacetates

Topics

• Animals
• Chronic Disease
• Disease Models, Animal
• Iodoacetates (toxicity)
• Male
• Osteoarthritis (chemically induced, complications, physiopathology)
• Pain (etiology, physiopathology)
• Rats
• Rats, Sprague-Dawley
• Time Factors