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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cereb+Blood+Flow+Metab
2016 ; 36
(4
): 781-93
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CD200 restrains macrophage attack on oligodendrocyte precursors via toll-like
receptor 4 downregulation
#MMPMID26661156
Hayakawa K
; Pham LD
; Seo JH
; Miyamoto N
; Maki T
; Terasaki Y
; Sakad?i? S
; Boas D
; van Leyen K
; Waeber C
; Kim KW
; Arai K
; Lo EH
J Cereb Blood Flow Metab
2016[Apr]; 36
(4
): 781-93
PMID26661156
show ga
There are numerous barriers to white matter repair after central nervous system
injury and the underlying mechanisms remain to be fully understood. In this
study, we propose the hypothesis that inflammatory macrophages in damaged white
matter attack oligodendrocyte precursor cells via toll-like receptor 4 signaling
thus interfering with this endogenous progenitor recovery mechanism. Primary cell
culture experiments demonstrate that peritoneal macrophages can attack and digest
oligodendrocyte precursor cells via toll-like receptor 4 signaling, and this
phagocytosis of oligodendrocyte precursor cells can be inhibited by using
CD200-Fc to downregulate toll-like receptor 4. In an in vivo model of white
matter ischemia induced by endothelin-1, treatment with CD200-Fc suppressed
toll-like receptor 4 expression in peripherally circulating macrophages, thus
restraining macrophage phagocytosis of oligodendrocyte precursor cells and
leading to improved myelination. Taken together, these findings suggest that
deleterious macrophage effects may occur after white matter ischemia, whereby
macrophages attack oligodendrocyte precursor cells and interfere with endogenous
recovery responses. Targeting this pathway with CD200 may offer a novel
therapeutic approach to amplify endogenous oligodendrocyte precursor
cell-mediated repair of white matter damage in mammalian brain.