Mirror-image pain is mediated by nerve growth factor produced from tumor necrosis factor alpha-activated satellite glia after peripheral nerve injury

被引：76

作者：

Cheng, Chau-Fu ^{[1
]}

Cheng, Jen-Kun ^{[2
,3
]}

Chen, Chih-Yang ^{[1
]}

Lien, Cheng-Chang ^{[1
]}

Chu, Dachen ^{[4
]}

Wang, Szu-Yi ^{[1
,2
,3
]}

Tsaur, Meei-Ling ^{[1
]}

机构：

[1] Natl Yang Ming Univ, Inst Neurosci, Taipei 112, Taiwan

[2] Mackay Jr Coll Med Nursing & Management, Mackay Mem Hosp, Dept Anesthesiol, Taipei, Taiwan

[3] Mackay Med Coll, Dept Med, Taipei, Taiwan

[4] Taipei City Hosp, Zhongxing Branch, Dept Neurosurg, Taipei 103, Taiwan

来源：

PAIN | 2014年 / 155卷 / 05期

关键词：

Contralateral pain; Spinal nerve ligation; Mechanical hypersensitivity; Dorsal root ganglion; Glial inhibitor; Nociceptor excitability; Neurotrophic factors; DORSAL-ROOT GANGLIA; PRIMARY SENSORY NEURONS; CONTRALATERAL NEUROPATHIC PAIN; P75 NEUROTROPHIN RECEPTOR; TNF-ALPHA; SPINAL-CORD; UP-REGULATION; PROINFLAMMATORY CYTOKINES; MECHANICAL ALLODYNIA; ADULT-RAT;

D O I：

10.1016/j.pain.2014.01.010

中图分类号：

R614 [麻醉学];

学科分类号：

100217 ;

摘要：

Mirror-image pain is characterized by mechanical hypersensitivity on the uninjured mirror-image side. Recent reports favor central mechanisms, but whether peripheral mechanisms are involved remains unclear. We used unilateral spinal nerve ligation (SNL) to induce mirror-image pain in rats. On the mirror-image (contralateral) side, we found that satellite glia in the dorsal root ganglion (DRG) were activated, whereas macrophages/Schwann cells in the DRG and astrocytes/oligodendrocytes/microglia in the dorsal spinal cord were not. Subsequently, an increase in nerve growth factor (NGF) was detected in the contralateral DRG, and NGF immunoreactivity was concentrated in activated satellite glia. These phenomena were abolished if fluorocitrate (a glial inhibitor) was intrathecally injected before SNL. Electrophysiological recordings in cultured small DRG neurons showed that exogenous NGFenhanced nociceptor excitability. Intrathecal injection of NGF into naive rats induced long-lasting mechanical hypersensitivity, similar to SNL-evoked mirror-image pain. Anti-NGF effectively relieved SNL-evoked mirror-image pain. In the contralateral DRG, the SNL-evoked tumor necrosis factor alpha (TNF-alpha) increase, which started later than in the ipsilateral DRG and cerebrospinal fluid, occurred earlier than satellite glial activation and the NGF increase. Intrathecal injection of TNF-alpha into naive rats not only activated satellite glia to produce extra NGF in the DRG but also evoked mechanical hypersensitivity, which could be attenuated by anti-NGF injection. These results suggest that after SNL, satellite glia in the contralateral DRG are activated by TNF-alpha that diffuses from the injured side via cerebrospinal fluid, which then activates satellite glia to produce extra NGF to enhance nociceptor excitability, which induces mirror-image pain. (c) 2014 International Association for the Study of Pain. Published by Elsevier B. V. All rights reserved.

引用

页码：906 / 920

页数：15

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