Chemokine (C-C motif) receptor 5 is an important pathological regulator in the development and maintenance of neuropathic pain.

Abstract:

BACKGROUND:The chemokine family has been revealed to be involved in the pathogenesis of neuropathic pain. In this study, the authors investigated the role of chemokine (C-C motif) ligand 3 and its receptors chemokine (C-C motif) receptor 1 and chemokine (C-C motif) receptor (CCR) 5 in neuropathic pain. METHODS:A spinal nerve injury model was established in adult male Wistar rats. The von Frey test and hot plate test were performed to evaluate neuropathic pain behavior, and real-time quantitative reverse transcription polymerase chain reaction, in situ hybridization, and immunohistochemistry were performed to understand the molecular mechanisms. RESULTS:The expression levels of chemokine (C-C motif) ligand 3 and CCR5 messenger RNA in the spinal cord were up-regulated after nerve injury, which was possibly due to CD11b-positive microglia. Single intrathecal administration of recombinant chemokine (C-C motif) ligand 3 produced biphasic tactile allodynia; each phase of pain behavior was induced by different receptors. Intrathecal injection of CCR5 antagonist suppressed the development of tactile allodynia (12.81 ± 1.33 g vs. 3.52 ± 0.41 g [mean ± SEM, drug vs. control in paw-withdrawal threshold]; P < 0.05, n = 6 each) and could reverse established tactile allodynia (10.87 ± 0.91 g vs. 3.43 ± 0.28 g; P < 0.05, n = 8 and 7). Furthermore, Oral administration of CCR5 antagonist could reverse established tactile allodynia (8.20 ± 1.27 g vs. 3.18 ± 0.46 g; P < 0.05, n = 4 each). CONCLUSIONS:Pharmacological blockade of CCR5 was effective in the treatment of the development and maintenance phases of neuropathic pain. Thus, CCR5 antagonists may be potential new drugs for the treatment of neuropathic pain.

journal_name

Anesthesiology

journal_title

Anesthesiology

authors

Matsushita K,Tozaki-Saitoh H,Kojima C,Masuda T,Tsuda M,Inoue K,Hoka S

doi

10.1097/ALN.0000000000000190

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

1491-503

issue

6

eissn

0003-3022

issn

1528-1175

journal_volume

120

pub_type

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