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DNA-Mediated Interferon Signature Induction by SLE Serum Occurs in Monocytes Through Two Pathways: A Mechanism to Inhibit Both Pathways
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DNA-Mediated Interferon Signature Induction by SLE Serum Occurs in Monocytes Through Two Pathways: A Mechanism to Inhibit Both Pathways
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Journal Article
DNA-Mediated Interferon Signature Induction by SLE Serum Occurs in Monocytes Through Two Pathways: A Mechanism to Inhibit Both Pathways
2018
Overview
A primary mechanism for activation of innate immunity is recognition of damage or pathogen associated molecular patterns by pattern recognition receptors (PRRs). Nucleic acid is a damage associated molecular pattern molecule that when internalized into a monocyte and recognized by intracellular nucleic acid sensing toll like receptors will cause production of type 1 interferon. The process by which DNA or RNA is delivered into the cytosol of monocytes in systemic lupus erythematosus remains incompletely understood, and therapeutic approaches to prevent DNA-mediated monocyte activation are needed. We identified two mechanisms for internalization of DNA by monocytes. IgG-bound DNA was internalized by interacting with Fc gamma receptor IIa, while high-mobility group box-1 protein-bound DNA was internalized by interacting with the receptor for advanced glycation end products. Both pathways contribute to an inflammatory phenotype in monocytes exposed to serum from patients with SLE. Moreover, both of these pathways can be inhibited by a pentapeptide, DWEYS, which is a DNA mimetope. In one instance DWEYS directly competes with DNA for antibody binding and in the other DWEYS binds high-mobility group box-1 and blocks its interaction with RAGE. Our data highlight distinct pathways involved in nucleic acid enters monocytes in SLE, and identify a potential therapeutic to prevent nucleic acid internalization in SLE.
Publisher
Frontiers Media SA,Frontiers Media S.A
Subject
/ Advanced glycosylation end products
/ Animals
/ Antibodies, Antinuclear - blood
/ Antibodies, Antinuclear - immunology
/ Antigens
/ Cell-Free Nucleic Acids - blood
/ Cell-Free Nucleic Acids - immunology
/ Cytosol
/ Disease
/ DNA
/ Female
/ Humans
/ Immunoglobulin G - immunology
/ Lupus Erythematosus, Systemic - blood
/ Lupus Erythematosus, Systemic - immunology
/ Lupus Erythematosus, Systemic - pathology
/ Male
/ Pattern recognition receptors
/ Peptides
/ Reagents
/ receptor for advanced glycation end products (RAGE)
/ Systemic lupus erythematosus
