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2017 ; 13
(ä): 1744806917743680
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Colchicine alleviates acute postoperative pain but delays wound repair in mice:
roles of neutrophils and macrophages
#MMPMID29108466
Sukeishi A
; Isami K
; Hiyama H
; Imai S
; Nagayasu K
; Shirakawa H
; Nakagawa T
; Kaneko S
Mol Pain
2017[Jan]; 13
(ä): 1744806917743680
PMID29108466
show ga
BACKGROUND: Acute postoperative pain is induced by most incisional surgeries and
usually resolves with wound repair. However, many patients experience moderate to
severe pain despite receiving currently available postoperative pain relief.
Accumulating evidence suggests that inflammatory cells, neutrophils, and
macrophages infiltrating the wound site contribute to the acute inflammation,
pain, and subsequent wound repair. Colchicine is commonly used to relieve pain in
gout by inhibiting the infiltration of granulocytes and other motile cells. In
this study, we examined the effects of colchicine on acute postoperative pain and
wound repair by correlating the infiltration of neutrophils and macrophages in a
mouse model of postoperative pain induced by plantar incision. Furthermore, these
effects of colchicine were compared with clodronate liposomes, which selectively
deplete circulating macrophages. RESULTS: Plantar incision induced mechanical
hypersensitivity in the ipsilateral hind paw that peaked one day and lasted for
three days after the surgery. Treatment with colchicine significantly attenuated
the early infiltration of Gr1-positive cells (neutrophils) around the incision
site and mechanical hypersensitivity, which was accompanied with inhibition of
the subsequent infiltration of Iba1-positive cells (macrophages) and macrophage
polarization toward the proinflammatory M1 phenotype. By contrast, an intravenous
injection of clodronate liposomes significantly inhibited the infiltration of
macrophages around the incision site but had little effect on the infiltration of
neutrophils or mechanical hypersensitivity. Importantly, colchicine treatment
significantly delayed wound closure after the incisional surgery, whereas
clodronate liposome administration had no effect on wound closure. CONCLUSION:
These results suggest that colchicine can alleviate acute postoperative pain and
also enhance the risk of delayed wound repair, which are associated with the
suppression of neutrophil and subsequent proinflammatory M1 macrophage
infiltration around the incision site, while the involvement of macrophages may
be limited.