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Axl and MerTK regulate synovial inflammation and are modulated by IL-6 inhibition in rheumatoid arthritis
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Axl and MerTK regulate synovial inflammation and are modulated by IL-6 inhibition in rheumatoid arthritis
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Journal Article
Axl and MerTK regulate synovial inflammation and are modulated by IL-6 inhibition in rheumatoid arthritis
2024
Overview
The TAM tyrosine kinases, Axl and MerTK, play an important role in rheumatoid arthritis (RA). Here, using a unique synovial tissue bioresource of patients with RA matched for disease stage and treatment exposure, we assessed how Axl and MerTK relate to synovial histopathology and disease activity, and their topographical expression and longitudinal modulation by targeted treatments. We show that in treatment-naive patients, high
AXL
levels are associated with pauci-immune histology and low disease activity and inversely correlate with the expression levels of pro-inflammatory genes. We define the location of Axl/MerTK in rheumatoid synovium using immunohistochemistry/fluorescence and digital spatial profiling and show that Axl is preferentially expressed in the lining layer. Moreover, its ectodomain, released in the synovial fluid, is associated with synovial histopathology. We also show that Toll-like-receptor 4-stimulated synovial fibroblasts from patients with RA modulate MerTK shedding by macrophages. Lastly, Axl/MerTK synovial expression is influenced by disease stage and therapeutic intervention, notably by IL-6 inhibition. These findings suggest that Axl/MerTK are a dynamic axis modulated by synovial cellular features, disease stage and treatment.
The TAM tyrosine kinases, Axl and MerTK, have been implicated in rheumatoid arthritis (RA). Here, using a synovial tissue bioresource of patients with RA, the authors describe how Axl and MerTK expression and function are linked to synovial histopathology, disease activity, and therapeutic intervention with IL-6 inhibitors.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/51
/ 38
/ 38/91
/ Axl Receptor Tyrosine Kinase
/ c-Mer Tyrosine Kinase - genetics
/ c-Mer Tyrosine Kinase - metabolism
/ Humanities and Social Sciences
/ Humans
/ Kinases
/ Proto-Oncogene Proteins - genetics
/ Proto-Oncogene Proteins - metabolism
/ Receptor Protein-Tyrosine Kinases - genetics
/ Receptor Protein-Tyrosine Kinases - metabolism
/ Science
/ Synovial Membrane - metabolism
/ Tyrosine
