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2017 ; 8
(ä): 1116
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Complement Component C4 Regulates the Development of Experimental Autoimmune
Uveitis through a T Cell-Intrinsic Mechanism
#MMPMID28955337
Zhang L
; Bell BA
; Li Y
; Caspi RR
; Lin F
Front Immunol
2017[]; 8
(ä): 1116
PMID28955337
show ga
In addition to its conventional roles in the innate immune system, complement has
been found to directly regulate T cells in the adaptive immune system. Complement
components, including C3, C5, and factor D, are important in regulating T cell
responses. However, whether complement component C4 is involved in regulating T
cell responses remains unclear. In this study, we used a T cell-dependent model
of autoimmunity, experimental autoimmune uveitis (EAU) to address this issue. We
compared disease severity in wild-type (WT) and C4 knockout (KO) mice using
indirect ophthalmoscopy, scanning laser ophthalmoscopy, spectral-domain optical
coherence tomography, and histopathological analysis. We also explored the
underlying mechanism by examining T cell responses in ex vivo antigen-specific
recall assays and in in vitro T cell priming assays using bone marrow-derived
dendritic cells, splenic dendritic cells, and T cells from WT or C4 KO mice. We
found that C4 KO mice develop less severe retinal inflammation than WT mice in
EAU and show reduced autoreactive T cell responses and decreased retinal T cell
infiltration. We also found that T cells, but not dendritic cells, from C4 KO
mice have impaired function. These results demonstrate a previously unknown role
of C4 in regulating T cell responses, which affects the development of T
cell-mediated autoimmunity, as exemplified by EAU. Our data could shed light on
the pathogenesis of autoimmune uveitis in humans.