New insights into macrophage heterogeneity in rheumatoid arthritis

Rheumatoid arthritis (RA) is a prototypic autoimmune disease that primarily affects joints. Clinical studies and animal models evidenced that mononuclear phagocytes including monocytes and macrophages are crucial to RA pathogenesis, contributing to inflammation and destruction of cartilage and bone. The last decade of research has tremendously changed our view on the origin of tissue-resident macrophages. In light of the recent publications that reveal important phenotypic and functional heterogeneity among macrophages, it is of paramount importance to identify the synovial macrophage subsets that might amplify the inflammatory response or promote the restoration of tissue homeostasis. In this review, we highlight latest studies applying single-cell RNA sequencing that provide deeper insights in macrophage subsets and their putative functions within both human and mouse synovial joint tissue. (C) 2020 Societe francaise de rhumatologie. Published by Elsevier Masson SAS. All rights reserved.

Automated summary

Rheumatoid arthritis primarily affects joints and mononuclear phagocytes play a crucial role in its pathogenesis. Recent research has highlighted the diversity among macrophages, emphasizing the importance of identifying synovial macrophage subsets for amplifying inflammatory responses or promoting tissue homeostasis restoration.