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2017 ; 7
(1
): 9417
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A neuropeptide, Substance-P, directly induces tissue-repairing M2 like
macrophages by activating the PI3K/Akt/mTOR pathway even in the presence of IFN?
#MMPMID28842601
Lim JE
; Chung E
; Son Y
Sci Rep
2017[Aug]; 7
(1
): 9417
PMID28842601
show ga
Macrophage polarization plays an important role in tissue damage and repair. In
this study, we show that Substance-P (SP) can directly induce M2 polarization of
inflammatory macrophages. SP induced the differentiation of GM-CSF-differentiated
pro-inflammatory macrophages into alternatively activated phagocytic M2 like
macrophages (M2(SP)) through direct activation of the PI3K/Akt/mTOR/S6kinase
pathway and induction of Arginase-1, CD163, and CD206, all of which were
nullified by pretreatment with the neurokinin-1 receptor (NK-1R) antagonist
RP67580 and specific signaling pathway inhibitors. M2(SP) were distinct from
IL-4/IL-13-induced M2a and IL-10-induced M2c subtypes; they did not show STAT
activation and exhibited high phagocytic and endothelial adhesive activity.
Furthermore, SP had a dominant effect on M2 polarization over Interferon gamma
(IFN?), a potent M1-skewing cytokine, and effectively induced the M2 phenotype in
monocytes and the human THP-1 cell line. Finally, adoptively transferred M2(SP)
migrated to a spinal cord injury (SCI) lesion site and improved functional
recovery. Collectively, our findings show that SP, a neuropeptide, plays a role
as a novel cytokine by inducing tissue-repairing M2(SP) macrophages and thus may
be developed for pharmacological intervention in diseases involving chronic
inflammation and acute injury.