Increased expression of FcgammaRI/CD64 on circulating monocytes parallels ongoing inflammation and nephritis in lupus.

Abstract:

INTRODUCTION:The high-affinity receptor for IgG Fcgamma/CD64 is critical for the development of lupus nephritis (LN). Cross-linking Fc receptor on recruited monocytes by IgG-containing immune complexes is a key step in immune-complex-mediated nephritis in systemic lupus erythematosus (SLE). The goal of this study was to determine whether expression of Fc receptor (FcgammaR) I on circulating monocytes is associated with systemic inflammation and renal disease in SLE patients. METHODS:We studied 205 SLE patients (132 with LN and 73 without LN) along with 74 healthy control individuals. Surface expression of CD14 (monocytes), FcgammaRI/CD64, FcgammaRII/CD32, and FcgammaRIII/CD16 was evaluated by flow cytometry. Monocyte function was assessed by determining the migratory capacity and the ability to produce CCL2 (monocyte chemotractic protein 1). High-sensitivity C-reactive protein, C3 and C4 were measured by nephelometry. RESULTS:There was little difference in the expression of FcgammaRIII/CD16 or FcgammaRIII/CD32 on circulating monocytes between patients with SLE and control individuals. In contrast, FcgammaRI/CD64 expression was significantly higher in SLE patients and even higher in patients with LN. FcgammaRI/CD64 expression was positively associated with serum creatinine and indicators of systemic inflammation. Monocytes from patients with high FcgammaRI/CD64 expression also exhibited increased chemotaxis and capacity to produce monocyte chemotractic protein 1. CONCLUSIONS:Increased FcgammaRI/CD64 expression on circulating monocytes parallels systemic inflammation and renal disease in SLE patients. We propose that circulating monocytes activated by immune complexes and/or proinflammatory mediators upregulate surface expression of FcgammaRI/CD64 in SLE. The enhanced chemotactic and inflammatory potential of the activated monocytes may participate in a vicious cycle of immune cell recruitment and renal injury in SLE.

journal_name

Arthritis Res Ther

authors

Li Y,Lee PY,Sobel ES,Narain S,Satoh M,Segal MS,Reeves WH,Richards HB

doi

10.1186/ar2590

subject

Has Abstract

pub_date

2009-01-01 00:00:00

pages

R6

issue

1

eissn

1478-6354

issn

1478-6362

pii

ar2590

journal_volume

11

pub_type

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