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Abstract Granulocytic myeloid-derived suppressor cells (G-MDSCs) are immunoregulatory cells of the neutrophil lineage. Here, we show that immunoregulation by G-MDSCs is imprinted by the joint tissue microenvironment in patients with axial spondyloarthritis and in animal models of inflammatory arthritis. We demonstrate that the suppressive function of G-MDSCs is significantly enhanced in the joint tissue, but not in the circulation.
Abstract Psoriatic disease initially affects the skin and later extends to the joints. Here, we show a two-step process that orchestrates the spread of inflammation from the skin to the joints. Induction of psoriatic skin disease in photoconvertible mice, followed by sequencing and computational characterization of skin-derived cells in the joints, was used to identify a population of CD2+MHC-II+CCR2+ myeloid precursors that builds a skin-derived myeloid cell compartment in the joints.
Abstract Fibroblasts are polymorphic cells with pleiotropic roles in organ morphogenesis, tissue homeostasis and immune responses. In fibrotic diseases, fibroblasts synthesize abundant amounts of extracellular matrix, which induces scarring and organ failure. By contrast, a hallmark feature of fibroblasts in arthritis is degradation of the extracellular matrix because of the release of metalloproteinases and degrading enzymes, and subsequent tissue destruction.
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