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2015 ; 5
(ä): 11888
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Intermediate monocytes in ANCA vasculitis: increased surface expression of ANCA
autoantigens and IL-1? secretion in response to anti-MPO antibodies
#MMPMID26149790
O'Brien EC
; Abdulahad WH
; Rutgers A
; Huitema MG
; O'Reilly VP
; Coughlan AM
; Harrington M
; Heeringa P
; Little MA
; Hickey FB
Sci Rep
2015[Jul]; 5
(ä): 11888
PMID26149790
show ga
ANCA vasculitis encompasses several autoimmune conditions characterised by
destruction of small vessels, inflammation of the respiratory tract and
glomerulonephritis. Most patients harbour autoantibodies to myeloperoxidase (MPO)
or proteinase 3 (PR3). Clinical and experimental data suggest that pathogenesis
is driven by ANCA-mediated activation of neutrophils and monocytes. We
investigated a potential role for distinct monocyte subsets. We found that the
relative proportion of intermediate monocytes is increased in patients versus
control individuals, and both MPO and PR3 are preferentially expressed on these
cells. We demonstrate that MPO and PR3 are expressed independently of each other
on monocytes and that PR3 is not associated with CD177. MPO expression correlates
with that of Fc receptor CD16 on intermediate monocytes. Monocyte subsets respond
differently to antibodies directed against MPO and PR3, with anti-MPO but not
anti-PR3 leading to increased IL-1?, IL-6 and IL-8 production. In concordance
with the observed higher surface expression of MPO on intermediate monocytes,
this subset produces the highest quantity of IL-1? in response to anti-MPO
stimulation. These data suggest that monocytes, specifically, the intermediate
subset, may play a role in ANCA vasculitis, and also indicate that substantial
differences exist between the effect of anti-MPO and anti-PR3 antibodies on these
cells.