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Spinal matrix metalloproteinase 3 mediates inflammatory hyperalgesia via a tumor necrosis factor-dependent mechanism.

Authors: Christianson, CA  Fitzsimmons, BL  Shim, JH  Agrawal, A  Cohen, SM  Hua, XY  Yaksh, TL 
Citation: Christianson CA, etal., Neuroscience. 2012 Jan 3;200:199-210. doi: 10.1016/j.neuroscience.2011.10.019. Epub 2011 Oct 20.
Pubmed: (View Article at PubMed) PMID:22056600
DOI: Full-text: DOI:10.1016/j.neuroscience.2011.10.019

Matrix metalloproteinases (MMPs) have been implicated in the modulation of synaptic plasticity, glial activation, and long-term potentiation in the CNS. Here we demonstrate for the first time a mechanism for the regulation of nociceptive processing by spinal MMP-3 during peripheral inflammation. We first determined by western blotting that the catalytic (active) form of MMP-3 (cMMP-3) is increased in lumbar spinal cord following peripheral inflammation in rats. The peripheral inflammation-induced thermal hyperalgesia and tactile hypersensitivity was transiently (2-3 h) attenuated by intrathecal (IT) pretreatment with either an MMP-3 inhibitor (NNGH), or a broad spectrum MMP inhibitor (GM6001). In addition, IT delivery of cMMP-3 evoked hypersensitivity, whereas the pro (enzymatically inactive) form of MMP-3 did not. This suggests a pro-algesic effect of spinal MMP-3 mediated by an enzymatic mechanism. This cMMP-3-induced hypersensitivity is concurrent with increased tumor necrosis factor (TNF) in the spinal cord. The hypersensitivity behavior is prevented by intrathecal etanercept (TNF blockade). Treatment with cMMP-3 resulted in an increase in TNF release from spinal primary microglial, but not astrocyte cultures. These findings thus present direct evidence implicating MMP-3 in the coordination of spinal nociceptive processing via a spinal TNF-dependent mechanism.

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RGD ID: 8693664
Created: 2014-07-17
Species: All species
Last Modified: 2014-07-17
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.