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2016 ; 23
(6
): 1086-96
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Enhanced efferocytosis by dendritic cells underlies memory T-cell expansion and
susceptibility to autoimmune disease in CD300f-deficient mice
#MMPMID26768664
Tian L
; Choi SC
; Lee HN
; Murakami Y
; Qi CF
; Sengottuvelu M
; Voss O
; Krzewski K
; Coligan JE
Cell Death Differ
2016[Jun]; 23
(6
): 1086-96
PMID26768664
show ga
Homeostasis requires the immunologically silent clearance of apoptotic cells
before they become pro-inflammatory necrotic cells. CD300f (CLM-1) is a
phosphatidylserine receptor known to positively regulate efferocytosis by
macrophages, and CD300f gene-deficient mice are predisposed to develop a
lupus-like disease. Here we show that, in contrast to CD300f function in
macrophages, its expression inhibits efferocytosis by DC, and its deficiency
leads to enhanced antigen processing and T-cell priming by these DC. The
consequences are the expansion of memory T cells and increased ANA levels in aged
CD300f-deficient mice, which predispose CD300f-deficient mice to develop an overt
autoimmune disease when exposed to an overload of apoptotic cells, or an
exacerbated autoimmunity when combined with Fc?RIIB deficiency. Thus, our data
demonstrates that CD300f helps to maintain immune homeostasis by promoting
macrophage clearance of self-antigens, while conversely inhibiting DC uptake and
presentation of self-antigens.