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2016 ; 23
(11
): 1850-1861
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Spermidine alleviates experimental autoimmune encephalomyelitis through inducing
inhibitory macrophages
#MMPMID27447115
Yang Q
; Zheng C
; Cao J
; Cao G
; Shou P
; Lin L
; Velletri T
; Jiang M
; Chen Q
; Han Y
; Li F
; Wang Y
; Cao W
; Shi Y
Cell Death Differ
2016[Nov]; 23
(11
): 1850-1861
PMID27447115
show ga
Multiple sclerosis (MS) is a chronic and debilitating autoimmune disease,
characterized by chronic inflammatory demyelination in the nervous tissue and
subsequent neurological dysfunction. Spermidine, a natural polyamine, has been
shown to affect inflammation in some experimental models. We show here that
spermidine could alleviate experimental autoimmune encephalomyelitis (EAE), a
model for MS, through regulating the infiltration of CD4(+) T cells and
macrophages in central nervous system. Unexpectedly, we found that spermidine
treatment of MOG-specific T cells did not affect their pathogenic potency upon
adaptive transfer; however, spermidine diminished the ability of macrophages in
activating MOG-specific T cells ex vivo. Depletion of macrophages in diseased
mice completely abolished the therapeutic effect of spermidine, indicating a
critical role of spermidine-activated macrophages. Mechanistically, spermidine
was found to specifically suppress the expression of interleukin-1beta (IL-1?),
IL-12 and CD80 while enhance the expression of arginase 1 in macrophages.
Interestingly, macrophages from spermidine-treated mice could also reverse EAE
progression, while pretreatment of those macrophages with the arginase 1
inhibitor abrogated the therapeutic effect. Therefore, our studies revealed a
critical role of macrophages in spermidine-mediated treatment on EAE and provided
novel information for better management of MS.