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Nicotinamide phosphoribosyltransferase/visfatin expression by inflammatory monocytes mediates arthritis pathogenesis.

Abstract：

OBJECTIVES:Nicotinamide phosphoribosyltransferase (NAMPT)/pre-B-cell colony-enhancing factor/visfatin exerts multiple functions and has been implicated in the pathogenesis of rheumatoid arthritis. To gain insight into its role in arthritis and given that NAMPT is identified as a novel mediator of innate immunity, we addressed the function of monocyte-derived NAMPT in experimental arthritis by selective gene knockdown in inflammatory monocytes. METHODS:siRNA uptake and NAMPT expression were determined in Ly6Chigh and Ly6Clow monocyte subsets following intravenous injection of siRNA against NAMPT (siNAMPT) or non-targeting siRNA (siCT) formulated with the DMAPAP cationic liposome into mice. Mice with established collagen-induced arthritis (CIA) were treated weekly after disease onset with siNAMPT or siCT and clinical features were assessed. T-helper cell frequencies, cytokine production and percentage of IL-6-producing Ly6Chigh monocytes were analysed. Using a co-culture system consisting of purified CD14 monocytes and autologous CD4 T cells, NAMPT and cytokine production, and the percentage of IL-17-producing CD4 T cells, were determined following transfection of CD14 monocytes with siCT or siNAMPT. RESULTS:On intravenous injection, siRNA was preferentially engulfed by Ly6Chigh monocytes, and siRNA-mediated silencing of NAMPT expression in Ly6Chigh monocytes inhibited CIA progression. This effect was associated with reduced IL-6 production by Ly6Chigh monocytes, reduced proportion of Th17 cells and autoantibody titers, and decreased activation and infiltration of monocytes/macrophages and neutrophils in arthritic joints. Moreover, NAMPT-RNAi-silenced CD14 monocytes were found to reduce the percentage of IL-17-producing CD4 T cells in vitro. CONCLUSIONS:Our results show that the expression of NAMPT in Ly6Chigh monocytes promotes many downstream effects involved in inflammatory arthritis and demonstrate the utility of targeting disease-causing genes, such as NAMPT, in Ly6Chigh monocytes for therapeutic intervention in arthritis.

journal_name

Ann Rheum Dis

journal_title

Annals of the rheumatic diseases

authors

Présumey J,Courties G,Louis-Plence P,Escriou V,Scherman D,Pers YM,Yssel H,Pène J,Kyburz D,Gay S,Jorgensen C,Apparailly F

doi

10.1136/annrheumdis-2012-202403

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

1717-24

issue

eissn

0003-4967

issn

1468-2060

pii

annrheumdis-2012-202403

journal_volume

pub_type

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Nicotinamide phosphoribosyltransferase/visfatin expression by inflammatory monocytes mediates arthritis pathogenesis.