Alba Pueyo Moliner, Keita Ito, Frank Zaucke, Daniel J. Kelly, Mylène de Ruijter, Jos Malda
{"title":"Restoring articular cartilage: insights from structure, composition and development","authors":"Alba Pueyo Moliner, Keita Ito, Frank Zaucke, Daniel J. Kelly, Mylène de Ruijter, Jos Malda","doi":"10.1038/s41584-025-01236-7","DOIUrl":"https://doi.org/10.1038/s41584-025-01236-7","url":null,"abstract":"<p>Articular cartilage can withstand substantial compressive and shear forces within the joint and also reduces friction during motion. The exceptional mechanical properties of articular cartilage stem from its highly organized extracellular matrix (ECM). The ECM is composed mainly of collagen type II and is pivotal in conferring mechanical durability to the tissue within its proteoglycan-rich matrix. Articular cartilage is prone to injury and degeneration, and current treatments often fail to restore the mechanical function of this tissue. A key challenge is replicating the intricate collagen–proteoglycan network, which is essential for the long-lasting restoration and mechanical durability of the tissue. Understanding articular cartilage development, which arises between late embryonic and early juvenile development, is vital for the creation of durable therapeutic strategies. The development of the articular ECM involves the biosynthesis, fibrillogenesis and self-assembly of the collagen type II network, which, along with proteoglycans and minor ECM components, shapes the architecture of adult articular cartilage. A deeper understanding of these processes could inform biomaterial-based therapies aimed at improving therapeutic outcomes. Emerging biofabrication technologies offer new opportunities to integrate developmental principles into the creation of durable articular cartilage implants. Bridging fundamental biology with innovative engineering offers novel approaches to generating more-durable 3D implants for articular cartilage restoration.</p>","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"183 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A role for TGFβ and EBV in MIS-C pathogenesis","authors":"Maria Papatriantafyllou","doi":"10.1038/s41584-025-01244-7","DOIUrl":"https://doi.org/10.1038/s41584-025-01244-7","url":null,"abstract":"TGFβ compromises T cell responses against Epstein–Barr virus (EBV) and is associated with EBV reactivation in children with multisystem inflammatory syndrome (MIS-C).","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"132 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Profiling synovial tissue reveals OA subgroups","authors":"Sarah Onuora","doi":"10.1038/s41584-025-01241-w","DOIUrl":"https://doi.org/10.1038/s41584-025-01241-w","url":null,"abstract":"Analysis of synovial tissue samples led to the identification of inflammatory and fibrotic subgroups of osteoarthritis, which were associated with distinct fibroblast and macrophage populations.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"23 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Z-DNA as an inflammatory trigger in lupus","authors":"Maria Papatriantafyllou","doi":"10.1038/s41584-025-01243-8","DOIUrl":"https://doi.org/10.1038/s41584-025-01243-8","url":null,"abstract":"Ultraviolet light-induced mitochondrial damage in keratinocytes leads to accumulation of Z-DNA, perpetuating type I interferon responses in cutaneous lupus.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"33 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143712788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Imaging inflammation with leukocyte-targeted PET tracers","authors":"Filippo Fagni","doi":"10.1038/s41584-025-01239-4","DOIUrl":"https://doi.org/10.1038/s41584-025-01239-4","url":null,"abstract":"Molecular imaging techniques such as PET with the leukocyte-targeted probe 89Zr-CD45 are promising tools for rheumatology, providing a non-invasive whole-body assessment of the mechanisms that drive tissue inflammation. These techniques could improve diagnosis and disease monitoring, but further research is required before clinical implementation.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"88 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Oestrogens implicated in progression to arthritis","authors":"Sarah Onuora","doi":"10.1038/s41584-025-01242-9","DOIUrl":"https://doi.org/10.1038/s41584-025-01242-9","url":null,"abstract":"Cumulative exposure to oestrogens over a woman’s lifetime is associated with the risk of developing seronegative inflammatory arthritis.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"35 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Pentose phosphate pathway metabolite restores T cell balance in SLE","authors":"Maria Papatriantafyllou","doi":"10.1038/s41584-025-01238-5","DOIUrl":"https://doi.org/10.1038/s41584-025-01238-5","url":null,"abstract":"Gluconolactone promotes Treg cell function and might have potential for treating skin lesions in systemic lupus erythematosus.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"94 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143677715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
David Moulin, Jérémie Sellam, Francis Berenbaum, Jérôme Guicheux, Marie-Astrid Boutet
{"title":"The role of the immune system in osteoarthritis: mechanisms, challenges and future directions","authors":"David Moulin, Jérémie Sellam, Francis Berenbaum, Jérôme Guicheux, Marie-Astrid Boutet","doi":"10.1038/s41584-025-01223-y","DOIUrl":"10.1038/s41584-025-01223-y","url":null,"abstract":"Osteoarthritis (OA) is a chronic joint disease that has long been considered a simple wear-and-tear condition. Over the past decade, research has revealed that various inflammatory features of OA, such as low-grade peripheral inflammation and synovitis, contribute substantially to the pathophysiology of the disease. Technological advances in the past 5 years have revealed a large diversity of innate and adaptive immune cells in the joints, particularly in the synovium and infrapatellar fat pad. Notably, the presence of synovial lymphoid structures, circulating autoantibodies and alterations in memory T cell and B cell populations have been documented in OA. These data indicate a potential contribution of self-reactivity to the disease pathogenesis, blurring the often narrow and inaccurate line between chronic inflammatory and autoimmune diseases. The diverse immune changes associated with OA pathogenesis can vary across disease phenotypes, and a better characterization of their underlying molecular endotypes will be key to stratifying patients, designing novel therapeutic approaches and ultimately ameliorating treatment allocation. Furthermore, examining both articular and systemic alterations, including changes in the gut–joint axis and microbial dysbiosis, could open up novel avenues for OA management. This Review provides an update on the role of innate and adaptive immune cells in the pathogenesis of osteoarthritis. The authors discuss emerging therapeutics that target the immune system in osteoarthritis and the challenges that limit the movement towards personalized medicine.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"21 4","pages":"221-236"},"PeriodicalIF":29.4,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Treating inflammatory arthritis in individuals with concomitant cancer","authors":"Maria E. Suarez-Almazor","doi":"10.1038/s41584-025-01235-8","DOIUrl":"https://doi.org/10.1038/s41584-025-01235-8","url":null,"abstract":"Treating people with inflammatory arthritis and cancer is challenging given concerns around suppressing anti-tumour immunity. Targeted therapies, such as TNF inhibitors, can be safely used in patients with cancer who are in remission, but whether these treatments are safe for individuals with newly diagnosed or active cancer remains unclear.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"142 1","pages":""},"PeriodicalIF":33.7,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alen Zabotti, Sibel Zehra Aydin, Paula David, Andrea Di Matteo, Dennis McGonagle
{"title":"Delineating inflammatory from non-inflammatory mechanisms for therapy optimization in psoriatic arthritis","authors":"Alen Zabotti, Sibel Zehra Aydin, Paula David, Andrea Di Matteo, Dennis McGonagle","doi":"10.1038/s41584-025-01229-6","DOIUrl":"10.1038/s41584-025-01229-6","url":null,"abstract":"Psoriatic arthritis (PsA) is anatomically much more heterogeneous than rheumatoid arthritis, as, beyond synovitis, it often also involves enthesitis, peritendinitis, tenosynovitis, osteitis and periostitis. This heterogeneity currently precludes a gold standard for objectively defining resolution of inflammation following treatment, with enthesitis posing a particular challenge. Despite these difficulties, we apply lessons learned from rheumatoid arthritis to describe how patients with PsA and an inadequate response to therapy can be designated within two patient subgroups, characterized by persistent inflammatory PsA (PIPsA) and non-inflammatory PsA (NIPsA), respectively. The NIPsA phenotype is defined by the lack of ongoing joint inflammation, as confirmed through clinical assessment and imaging, along with normalized inflammatory marker levels. NIPsA might be associated with obesity, biomechanical-related pain, osteoarthritis, fibromyalgia, secondary post-inflammatory damage and central pain mechanisms. In this article, we frame PsA composite outcomes measures in relationship to the PIPsA and NIPsA phenotypes and propose that this approach might help to minimize unnecessary or ineffective cycling of PsA therapy in patients who acquire dominant non-inflammatory mechanisms and might also inform future trial design. In this Perspective, the authors propose that patients with psoriatic arthritis and an inadequate response to therapy can be classified into two distinct subgroups, characterized by persistent inflammatory and non-inflammatory phenotypes, and discuss potential mechanisms underlying these phenotypes, as well as considerations for treatment strategies and trial design.","PeriodicalId":18810,"journal":{"name":"Nature Reviews Rheumatology","volume":"21 4","pages":"237-248"},"PeriodicalIF":29.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143598837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}