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Published in: Molecular Pain 1/2011

Open Access 01-12-2011 | Research

Glial TNFα in the spinal cord regulates neuropathic pain induced by HIV gp120 application in rats

Authors: Wenwen Zheng, Handong Ouyang, Xuexing Zheng, Shue Liu, Marina Mata, David J Fink, Shuanglin Hao

Published in: Molecular Pain | Issue 1/2011

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Abstract

Background

HIV-associated sensory neuropathy (HIV-SN) is one of the most common forms of peripheral neuropathy, affecting about 30% of people with acquired immune deficiency syndrome (AIDS). The symptoms of HIV-SN are dominated by neuropathic pain. Glia activation in the spinal cord has become an attractive target for attenuating chronic pain. This study will investigate the role of spinal TNFα released from glia in HIV-related neuropathic pain.

Results

Peripheral gp120 application into the rat sciatic nerve induced mechanical allodynia for more than 7 weeks, and upregulated the expression of spinal TNFα in the mRNA and the protein levels at 2 weeks after gp120 application. Spinal TNFα was colocalized with GFAP (a marker of astrocytes) and Iba1 (a marker of microglia) in immunostaining, suggesting that glia produce TNFα in the spinal cord in this model. Peripheral gp120 application also increased TNFα in the L4/5 DRG. Furthermore, intrathecal administration of TNFα siRNA or soluble TNF receptor reduced gp120 application-induced mechanical allodynia.

Conclusions

Our results indicate that TNFα in the spinal cord and the DRG are involved in neuropathic pain, following the peripheral HIV gp120 application, and that blockade of the glial product TNFα reverses neuropathic pain induced by HIV gp120 application.
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Metadata
Title
Glial TNFα in the spinal cord regulates neuropathic pain induced by HIV gp120 application in rats
Authors
Wenwen Zheng
Handong Ouyang
Xuexing Zheng
Shue Liu
Marina Mata
David J Fink
Shuanglin Hao
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Molecular Pain / Issue 1/2011
Electronic ISSN: 1744-8069
DOI
https://doi.org/10.1186/1744-8069-7-40

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