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2016 ; 7
(ä): 11639
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Gut environment-induced intraepithelial autoreactive CD4(+) T cells suppress
central nervous system autoimmunity via LAG-3
#MMPMID27198196
Kadowaki A
; Miyake S
; Saga R
; Chiba A
; Mochizuki H
; Yamamura T
Nat Commun
2016[May]; 7
(ä): 11639
PMID27198196
show ga
The gut environment has been found to significantly influence autoimmune diseases
such as multiple sclerosis; however, immune cell mechanisms are unclear. Here we
show that the gut epithelium of myelin oligodendrocyte
glycoprotein(35-55)-specific T-cell receptor transgenic mice contains
environmental stimuli-induced intraepithelial lymphocytes (IELs) that inhibit
experimental autoimmune encephalomyelitis on transfer. These cells express
surface markers phenotypical of 'induced' IELs, have a TH17-like profile and
infiltrate the central nervous system (CNS). They constitutively express Ctla4
and Tgfb1 and markedly upregulate Lag3 expression in the CNS, thereby inhibiting
inflammation. We also demonstrate the suppressive capability of CD4(+) IELs with
alternative antigen specificities, their proliferation in response to gut-derived
antigens and contribution of the microbiota and dietary aryl hydrocarbon receptor
ligands to their induction. Thus, the gut environment favours the generation of
autoreactive CD4(+) T cells with unique regulatory functions, potentially
important for preventing CNS autoimmunity.