Satellite glia activation in dorsal root ganglion contributes to mechanical allodynia after selective motor fiber injury in adult rats.

Abstract

Increasing evidence suggests that activation of satellite glia cells (SGCs) in sensory ganglia play important roles in the development of neuropathic pain. The present study aimed to investigate the involvement of SGC activation in a novel model of motor nerve injury induced pain hypersensitivity. The neuropathic pain model was established by cervical 8 ventral root avulsion (C8VA). Glial fibrillary acidic protein (GFAP) was used as a marker of SGC activation. Unilateral C8VA resulted in mechanical allodynia, but not thermal hyperalgesia in bilateral paws. Expectedly, SGCs were robustly activated on as early as 1 day and persisted for at least 7 days in the ipsilateral and contralateral dorsal root ganglia (DRG) of C6, C7 and C8 after C8VA. Double immunofluorescence showed that almost all the activated SGCs enveloped neurofilament 200 (NF200) positive myelinated neurons in DRG. Local application of fluorocitrate (FC), a glial metabolism inhibitor, significantly decreased the number of activated SGCs and alleviated bilateral mechanical allodynia. These results suggest that SGC activation contributed to ipsilateral and mirror-image pain hypersensitivity after C8VA. Inhibition of SGC activation represented a promising therapeutic strategy for the management of neuropathic pain following brachial plexus root avulsion.

• Authors: Qiuju Yuan, Xiaodong Liu, Yan-Fang Xian, Min Yao, Xie Zhang, Pengyun Huang, Wutian Wu, Zhi-Xiu Lin
• Journal: Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (Biomed Pharmacother) Vol. 127 Pg. 110187 (Jul 2020) ISSN: 1950-6007 [Electronic] France
• PMID: 32361638 (Publication Type: Journal Article)
• Copyright: Copyright © 2020 The Author(s). Published by Elsevier Masson SAS.. All rights reserved.

Chemical References

• Citrates
• Glial Fibrillary Acidic Protein
• Neurofilament Proteins
• neurofilament protein H
• fluorocitrate

Topics

• Animals
• Citrates (pharmacology)
• Disease Models, Animal
• Ganglia, Spinal (cytology, metabolism)
• Glial Fibrillary Acidic Protein (metabolism)
• Hyperalgesia (etiology, physiopathology)
• Male
• Motor Neurons (pathology)
• Neuralgia (physiopathology)
• Neurofilament Proteins (metabolism)
• Rats
• Rats, Sprague-Dawley
• Satellite Cells, Perineuronal (metabolism)