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

Arthritis Research & Therapy
Yi LiHanno B Richards

Abstract

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. 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. 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 ...Continue Reading

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Citations

Aug 3, 2010·Archivum Immunologiae Et Therapiae Experimentalis·Yi LiWestley H Reeves
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Methods Mentioned

BETA
FCS
flow cytometry
density gradient centrifugation
biopsy

Software Mentioned

FCS Express
GraphPad
Prism
CellQuest

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