In:
Mediators of Inflammation, Hindawi Limited, Vol. 2018 ( 2018-12-10), p. 1-10
Abstract:
Diabetic neuropathic pain (DNP) is a prevalent complication in diabetes patients. Neuronal inflammation and activation of Toll-like receptor 4 (TLR4) are involved in the occurrence of DNP. However, the underlying mechanisms remain unclear. Downregulation of gamma-aminobutyric acid B (GABA B ) receptor contributes to the DNP. GABA B receptor interacts with NF- κ B, a downstream signaling factor of TLR4, in a neuropathic pain induced by chemotherapy. In this study, we determined the role of TLR4/Myd88/NF- κ B signaling pathways coupled to GABA B receptors in the generation of DNP. Intrathecal injection of baclofen (GABA B receptor agonist), LPS-RS ultrapure (TLR4 antagonist), MIP (MyD88 antagonist), or SN50 (NF- κ B inhibitor) significantly increased paw withdrawal threshold (PWT) and paw withdrawal thermal latency (PWTL) in DNP rats, while intrathecal injection of saclofen (GABA B receptor blocker) decreased PWT and PWTL in DNP rats. The expression of TLR4, Myd88, NF- κ Bp65, and their downstream components IL-1 and TNF- α was significantly higher in the spinal cord tissue in DNP rats compared to control rats. Following inhibition of TLR4, Myd88, and NF- κ B, the expression of IL-1 and TNF- α decreased. Activation of GABA B receptors downregulated the expression of TLR4, Myd88, NF- κ Bp65, IL-1, and TNF- α . Blockade of GABA B receptors significantly upregulated expression of TLR4, Myd88, NF- κ Bp65, IL-1, and TNF- α . These data suggest that activation of the TLR4/Myd88/NF- κ B signaling pathway is involved in the occurrence of DNP in rats. Activation of GABA B receptor in the spinal cord may suppress the TLR4/Myd88/NF- κ B signaling pathway and alleviate the DNP.
Type of Medium:
Online Resource
ISSN:
0962-9351
,
1466-1861
DOI:
10.1155/2018/6016272
Language:
English
Publisher:
Hindawi Limited
Publication Date:
2018
detail.hit.zdb_id:
2008065-7
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