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2015 ; 21
(1
): 233-41
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Loss of Allograft Inflammatory Factor-1 Ameliorates Experimental Autoimmune
Encephalomyelitis by Limiting Encephalitogenic CD4 T-Cell Expansion
#MMPMID25569805
Chinnasamy P
; Lutz SE
; Riascos-Bernal DF
; Jeganathan V
; Casimiro I
; Brosnan CF
; Sibinga NE
Mol Med
2015[Jan]; 21
(1
): 233-41
PMID25569805
show ga
Experimental autoimmune encephalomyelitis (EAE), an animal model of human
multiple sclerosis (MS), is mediated by myelin-specific autoreactive T cells that
cause inflammation and demyelination in the central nervous system (CNS), with
significant contributions from activated microglia and macrophages. The molecular
bases for expansion and activation of these cells, plus trafficking to the CNS
for peripheral cells, are not fully understood. Allograft inflammatory factor-1
(Aif-1) (also known as ionized Ca(2+) binding adapter-1 [Iba-1]) is induced in
leukocytes in MS and EAE; here we provide the first assessment of Aif-1 function
in this setting. After myelin oligodendrocyte glycoprotein peptide (MOG35-55)
immunization, Aif-1-deficient mice were less likely than controls to develop EAE
and had less CNS leukocyte infiltration and demyelination; their spinal cords
contained fewer CD4 T cells and microglia and more CD8 T cells. These mice also
showed significantly less splenic CD4 T-cell expansion and activation, plus
decreased proinflammatory cytokine expression. These findings identify Aif-1 as a
potent molecule that promotes expansion and activation of CD4 T cells, plus
elaboration of a proinflammatory cytokine milieu, in MOG35-55-induced EAE and as
a potential therapeutic target in MS.