CCR2 Expression in Neutrophils Plays a Critical Role in Their Migration Into the Joints in Rheumatoid Arthritis

Arthritis & Rheumatology
Jhimmy TalbotJose C Alves-Filho

Abstract

Infiltration of neutrophils into the joints plays an important role in bone erosion and articular destruction in rheumatoid arthritis (RA). Neutrophil trafficking during inflammation is a process that involves activation of chemotactic receptors. Recent findings suggest that changes in chemotactic receptor patterns could occur in neutrophils under certain inflammatory conditions. The aim of this study was to evaluate the gain of responsiveness of neutrophils to CCL2 in RA patients and to assess the role of CCL2 in driving neutrophil infiltration into the joints. Neutrophils were purified from the peripheral blood of patients with RA or from mice with antigen-induced arthritis (AIA). Expression of CCR2 was evaluated using polymerase chain reaction, flow cytometry, and immunofluorescence analyses. In vitro chemotaxis to CCL2 was assayed to evaluate the functional significance of de novo CCR2 expression. The murine AIA model was used to evaluate the in vivo role of CCR2 in neutrophil infiltration into the joints. High CCR2 expression and responsiveness to CCL2 were observed in neutrophils from the blood of patients with early RA and in neutrophils from the blood and bone marrow of mice with AIA. Genetic deficiency or pharmacologic...Continue Reading

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