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Nicotinamide phosphoribosyltransferase/visfatin expression by inflammatory monocytes mediates arthritis pathogenesis


Présumey, Jessy; Courties, Gabriel; Louis-Plence, Pascale; Escriou, Virginie; Scherman, Daniel; Pers, Yves-Marie; Yssel, Hans; Pène, Jérôme; Kyburz, Diego; Gay, Steffen; Jorgensen, Christian; Apparailly, Florence (2013). Nicotinamide phosphoribosyltransferase/visfatin expression by inflammatory monocytes mediates arthritis pathogenesis. Annals of the Rheumatic Diseases, 72(10):1717-1724.

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 Ly6C(high) and Ly6C(low) 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 Ly6C(high) 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 Ly6C(high) monocytes, and siRNA-mediated silencing of NAMPT expression in Ly6C(high) monocytes inhibited CIA progression. This effect was associated with reduced IL-6 production by Ly6C(high) 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 Ly6C(high) monocytes promotes many downstream effects involved in inflammatory arthritis and demonstrate the utility of targeting disease-causing genes, such as NAMPT, in Ly6C(high) monocytes for therapeutic intervention in arthritis.

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 Ly6C(high) and Ly6C(low) 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 Ly6C(high) 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 Ly6C(high) monocytes, and siRNA-mediated silencing of NAMPT expression in Ly6C(high) monocytes inhibited CIA progression. This effect was associated with reduced IL-6 production by Ly6C(high) 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 Ly6C(high) monocytes promotes many downstream effects involved in inflammatory arthritis and demonstrate the utility of targeting disease-causing genes, such as NAMPT, in Ly6C(high) monocytes for therapeutic intervention in arthritis.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Rheumatology Clinic and Institute of Physical Medicine
04 Faculty of Medicine > Center for Integrative Human Physiology
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2013
Deposited On:15 Mar 2013 12:15
Last Modified:05 Apr 2016 16:41
Publisher:BMJ Publishing Group
ISSN:0003-4967
Free access at:PubMed ID. An embargo period may apply.
Publisher DOI:https://doi.org/10.1136/annrheumdis-2012-202403
PubMed ID:23313810

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