Ongoing pain in the MIA model of osteoarthritis.

Ongoing pain in the MIA model of osteoarthritis.
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DOI:
10.1016/j.neulet.2011.01.027
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发表时间:
2011-04-15
影响因子:
2.5
通讯作者:
Porreca F
Porreca F
中科院分区:
医学4区
文献类型:
--
作者:
Liu P;Okun A;Ren J;Guo RC;Ossipov MH;Xie J;King T;Porreca F

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骨关节炎(OA)伊萨一种慢性疼痛病症,其特征在于关节使用期间的疼痛以及休息时的疼痛(即,持续疼痛)。尽管将碘乙酸盐(MIA)注射到啮齿动物膝关节的关节内空间中是一种成熟的OA疼痛模型,其特征在于承重变化以及对触觉和热刺激的超敏反应,但尚不清楚该程序是否会引起持续疼痛。此外,这些疼痛成分的时间过程和可能的潜在机制仍然知之甚少。在这些研究中,我们证明了除了负重和诱发超敏反应的变化外,持续疼痛的存在。MIA注射后28天,脊髓可乐定阻断了负重和热过敏的变化,并产生了位置偏爱,表明MIA诱导了持续性和诱发性疼痛。这些发现表明,在该模型中,持续性疼痛存在于MIA后的较晚时间点,允许进行机制研究。
Osteoarthritis (OA) isa chronic pain condition characterized by pain during joint useas well aspain 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 ofongoing painin addition to changes in weight bearing and evoked hypersensitivity. Twenty-eight days following MIA injection, spinal clonidine blockedchanges in weight bearing and thermal hypersensitivityand 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.
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