Immunological Perspectives in Osteoarthritis Pathogenesis
Summary
Osteoarthritis has traditionally been characterised as a degenerative, wear-and-tear condition, but emerging evidence highlights its strong immunological component. Low-grade synovial inflammation is now recognised as a driving force in cartilage degradation and subchondral bone remodelling. Innate immune cells such as macrophages and neutrophils infiltrate the synovial membrane, where they release cytokines and matrix-degrading enzymes. Macrophage polarisation towards a pro-inflammatory phenotype amplifies tissue damage, while a failure of regulatory mechanisms permits persistent inflammation. Adaptive immune elements, notably T helper subsets and B cells, further shape the joint milieu through antigen presentation and antibody production. Ageing, obesity and metabolic dysregulation modify immune cell function and promote a chronic inflammatory state. Advances in single-cell techniques have revealed previously unrecognised immune cell subtypes and temporal changes in their activation after joint injury. Together, these findings underscore the role of immunometabolism, senescence-associated secretory phenotypes and epigenetic regulation in osteoarthritis pathogenesis. A deeper understanding of these pathways offers new opportunities for therapeutic intervention, including targeted modulation of cytokine networks, cell-surface receptors and metabolic regulators to restore joint homeostasis and slow disease progression.
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Immunological Perspectives in Osteoarthritis Pathogenesis publication trend
The graph below shows the total number of articles in immunological perspectives in osteoarthritis pathogenesis across all publications each year (not limited to Nature Index journals).
Technical terms
Synovium: The membrane lining joints that produces lubricating fluid and is a primary site of inflammation in osteoarthritis.
Macrophage polarisation: The process by which macrophages adopt pro-inflammatory (M1) or anti-inflammatory (M2) phenotypes in response to environmental cues.
Th17 cells: A subset of T helper lymphocytes that produce interleukin-17 and contribute to inflammatory responses in joints.
Regulatory T cells (Treg): A T cell subset that suppresses excessive immune reactions and maintains tissue homeostasis.
Bioinformatics: The use of computational tools to analyse biological data, such as gene expression profiles, to uncover disease-related molecular signatures.
References
- Identification of aging-related biomarkers and immune infiltration characteristics in osteoarthritis based on bioinformatics analysis and machine learning. Frontiers in Immunology (2023).
- Obesity, Inflammation, and Immune System in Osteoarthritis. Frontiers in Immunology (2022).
- Single-cell RNA-Seq reveals changes in immune landscape in post-traumatic osteoarthritis. Frontiers in Immunology (2022).
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