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Remote activation of microglia and pro-inflammatory cytokines predict the onset and severity of below-level neuropathic pain after spinal cord injury in rats.

作者信息

Detloff Megan Ryan, Fisher Lesley C, McGaughy Violetta, Longbrake Erin E, Popovich Phillip G, Basso D Michele

机构信息

Center for Brain and Spinal Cord Repair, Neuroscience Graduate Studies Program, The Ohio State University 43210, USA.

出版信息

Exp Neurol. 2008 Aug;212(2):337-47. doi: 10.1016/j.expneurol.2008.04.009. Epub 2008 Apr 20.


DOI:10.1016/j.expneurol.2008.04.009
PMID:18511041
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2600773/
Abstract

Spinal cord injury (SCI) impairs sensory systems causing chronic allodynia. Mechanisms underlying neuropathic pain have been more extensively studied following peripheral nerve injury (PNI) than after central trauma. Microglial activation, pro-inflammatory cytokine production and activation of p38 MAP kinase pathways may induce at-level allodynia following PNI. We investigated whether midthoracic SCI elicits similar behavioral and cellular responses below the level of injury (lumbar spinal cord; L5). Importantly, we show that anatomical connections between L5 and supraspinal centers remain intact after moderate SCI allowing direct comparison to a well-established model of peripheral nerve injury. We found that SCI elicits below-level allodynia of similar magnitude to at-level pain caused by a peripheral nerve injury. Moreover, the presence of robust microglial activation in L5 cord predicted allodynia in 86% of rats. Also increased phosphorylation of p38 MAP kinase occurred in the L5 dorsal horn of allodynic rats. For below-level allodynia after SCI, TNF-alpha and IL-1beta increased in the L5 dorsal horn by 7 dpo and returned to baseline by 35 dpo. Interestingly, IL-6 remains at normal levels early after SCI and increases at chronic time points. Increased levels of pro-inflammatory cytokines also occurred in the thalamus after SCI-induced allodynia. These data suggest that remote microglial activation is pivotal in the development and maintenance of below-level allodynia after SCI. Fractalkine, a known activator of microglia, and astrocytes were not primary modulators of below-level pain. Although the mechanisms of remote microglial activation are unknown, this response may be a viable target for limiting or preventing neuropathic pain after SCI in humans.

摘要

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本文引用的文献

[1]
Modulation of thalamic nociceptive processing after spinal cord injury through remote activation of thalamic microglia by cysteine cysteine chemokine ligand 21.

J Neurosci. 2007-8-15

[2]
Toll-like receptor (TLR)-2 and TLR-4 regulate inflammation, gliosis, and myelin sparing after spinal cord injury.

J Neurochem. 2007-7

[3]
Extracellular signal-regulated kinase-regulated microglia-neuron signaling by prostaglandin E2 contributes to pain after spinal cord injury.

J Neurosci. 2007-2-28

[4]
Sensitization of unmyelinated sensory fibers of the joint nerve to mechanical stimuli by interleukin-6 in the rat: an inflammatory mechanism of joint pain.

Arthritis Rheum. 2007-1

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Efficacy of propentofylline, a glial modulating agent, on existing mechanical allodynia following peripheral nerve injury.

Brain Behav Immun. 2007-2

[6]
Recombinant human TNFalpha induces concentration-dependent and reversible alterations in the electrophysiological properties of axons in mammalian spinal cord.

J Neurotrauma. 2006-8

[7]
Pain with no gain: allodynia following neural stem cell transplantation in spinal cord injury.

Exp Neurol. 2006-10

[8]
Tumor necrosis factor-alpha contributes to below-level neuropathic pain after spinal cord injury.

Ann Neurol. 2006-5

[9]
Activated microglia contribute to the maintenance of chronic pain after spinal cord injury.

J Neurosci. 2006-4-19

[10]
Role of astrocytic S100beta in behavioral hypersensitivity in rodent models of neuropathic pain.

Neuroscience. 2006-7-7

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