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Molecular Pain

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Open Access 01-12-2011 | Research

Spinal toll like receptor 3 is involved in chronic pancreatitis-induced mechanical allodynia of rat

Authors: Nian-Song Qian, Yong-Hui Liao, Quan-Xing Feng, Yu Tang, Ke-Feng Dou, Kai-Shan Tao

Published in: Molecular Pain | Issue 1/2011

Abstract

Background

Mechanisms underlying pain in chronic pancreatitis (CP) are incompletely understood. Our previous data showed that astrocytes were actively involved. However, it was unclear how astrocytic activation was induced in CP conditions. In the present study, we hypothesized that toll-like receptors (TLRs) were involved in astrocytic activation and pain behavior in CP-induced pain.

Results

To test our hypothesis, we first investigated the changes of TLR2-4 in the rat CP model induced by intrapancreatic infusion of trinitrobenzene sulfonic acid (TNBS). Western blot showed that after TNBS infusion, TLR3, but not TLR2 or TLR4, was increased gradually and maintained at a very high level for up to 5 w, which correlated with the changing course of mechanical allodynia. Double immunostaining suggested that TLR3 was highly expressed on astrocytes. Infusion with TLR3 antisense oligodeoxynucleotide (ASO) dose-dependently attenuated CP-induced allodynia. CP-induced astrocytic activation in the spinal cord was also significantly suppressed by TLR3 ASO. Furthermore, real-time PCR showed that IL-1β, TNF-α, IL-6 and monocyte chemotactic protein-1 (MCP-1) were significantly increased in spinal cord of pancreatic rats. In addition, TLR3 ASO significantly attenuated CP-induced up-regulation of IL-1β and MCP-1.

Conclusions

These results suggest a probable "TLR3-astrocytes-IL-1β/MCP-1" pathway as a positive feedback loop in the spinal dorsal horn in CP conditions. TLR3-mediated neuroimmune interactions could be new targets for treating persistent pain in CP patients.

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Title: Spinal toll like receptor 3 is involved in chronic pancreatitis-induced mechanical allodynia of rat
Authors: Nian-Song Qian
Yong-Hui Liao
Quan-Xing Feng
Yu Tang
Ke-Feng Dou
Kai-Shan Tao
Publication date: 01-12-2011
Publisher: BioMed Central
Published in: Molecular Pain / Issue 1/2011
Electronic ISSN: 1744-8069
DOI: https://doi.org/10.1186/1744-8069-7-15

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Spinal toll like receptor 3 is involved in chronic pancreatitis-induced mechanical allodynia of rat

Abstract

Background

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Results

Conclusions

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