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J Am Soc Nephrol. 2019 Aug 23. pii: ASN.2019030236. doi: 10.1681/ASN.2019030236. [Epub ahead of print]

Tolerogenic Dendritic Cells Attenuate Experimental Autoimmune Antimyeloperoxidase Glomerulonephritis.

Author information

1
Centre for Inflammatory Diseases, Department of Medicine, Monash University, Monash Medical Centre, Clayton, Australia; dragana.odobasic@monash.edu.
2
Centre for Inflammatory Diseases, Department of Medicine, Monash University, Monash Medical Centre, Clayton, Australia.
3
Division of Nephrology and Rheumatology, Fukuoka University School of Medicine, Fukuoka, Japan; and.
4
Department of Pediatric Nephrology.
5
Nephrology, and.
6
Immunology, Monash Health, Clayton, Australia.

Abstract

Background Because of their capacity to induce antigen-specific immunosuppression, tolerogenic dendritic cells are a promising tool for treatment of autoimmune conditions, such as GN caused by autoimmunity against myeloperoxidase (MPO).

METHODS:

We sought to generate tolerogenic dendritic cells to suppress anti-MPO GN by culturing bone marrow cells with an NFκB inhibitor (BAY 11-7082) and exposing them to a pulse of MPO. After administering these MPO/BAY dendritic cells or saline to mice with established anti-MPO or anti-methylated BSA (mBSA) immunity, we assessed immune responses and GN. We also examined mechanisms of action of MPO/BAY dendritic cells.

RESULTS:

MPO/BAY dendritic cells decreased anti-MPO immunity and GN without inhibiting immune responses against mBSA; they also induced IL-10-producing regulatory T cells in MPO-immunized mice without affecting IL-10+ CD4+Foxp3- type 1 regulatory T cells or regulatory B cells. MPO/BAY dendritic cells did not inhibit anti-MPO immunity when CD4+Foxp3+ cells were depleted in vivo, showing that regulatory T cells are required for their effects. Coculture experiments with dendritic cells and CD4+Foxp3- or CD4+Foxp3+ cells showed that MPO/BAY dendritic cells generate Foxp3+ regulatory T cells from CD4+Foxp3- cells through several pathways, and induce IL-10+ regulatory T cells via inducible costimulator (ICOS), which was confirmed in vivo. Transfer of MPO/BAY dendritic cell-induced regulatory T cells in vivo, with or without anti-IL-10 receptor antibody, demonstrated that they suppress anti-MPO immunity and GN via IL-10.

CONCLUSIONS:

MPO/BAY dendritic cells attenuate established anti-MPO autoimmunity and GN in an antigen-specific manner through ICOS-dependent induction of IL-10-expressing regulatory T cells. This suggests that autoantigen-loaded tolerogenic dendritic cells may represent a novel antigen-specific therapeutic option for anti-MPO GN.

KEYWORDS:

ANCA; glomerulonephritis; immunology and pathology; immunosuppression

PMID:
31444274
DOI:
10.1681/ASN.2019030236

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