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2016 ; 18
(ä): 92
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Impaired phagocytosis and reactive oxygen species production in phagocytes is
associated with systemic vasculitis
#MMPMID27102815
Johansson ÅC
; Ohlsson S
; Pettersson Å
; Bengtsson AA
; Selga D
; Hansson M
; Hellmark T
Arthritis Res Ther
2016[Apr]; 18
(ä): 92
PMID27102815
show ga
BACKGROUND: Anti-neutrophil cytoplasmic antibodies associated vasculitides (AAV)
is a group of autoimmune diseases, characterized by small vessel inflammation.
Phagocytes such as neutrophils and monocytes are the main effector cells found
around the inflamed vessel wall. Therefore, we wanted to investigate aspects of
function and activation of these cells in patients with AAV. METHODS: Flow
cytometry was used to evaluate: the expression of activation markers (CD11c,
CD62L, CD177 and C5aR); the number of recently released neutrophils from bone
marrow, defined as CD10(-)D16(low) cells in peripheral blood; and the capacity of
peripheral blood monocytes and polymorphonuclear leukocytes (PMN) to produce
reactive oxygen species and to phagocytose opsonized bacteria. RESULTS: AAV
patients (n?=?104) showed an increase of CD10(-)CD16(low) neutrophils and total
PMN in peripheral blood, suggesting a combination of increased bone marrow
release and prolonged survival. An increased percentage of AAV PMN expressed
CD177 but no other signs of activation were seen. A decreased production of
reactive oxygen species was observed in AAV phagocytes, which was associated with
disease activity. Moreover, granulocytes from patients with microscopic
polyangiitis showed lower oxidative burst capacity compared to patients with
granulomatosis with polyangiitis or eosinophilic granulomatosis with
polyangiitis. In addition, decreased phagocytosis capacity was seen in PMN and
monocytes. CONCLUSION: Our results indicate that phagocytes from AAV patients
have impaired function, are easily mobilized from bone marrow but are not
particularly activated. The association between low reactive oxygen species
formation in PMN and disease severity is consistent with findings in other
autoimmune diseases and might be considered as a risk factor.