ArticleJournal of immunology (Baltimore, Md. : 1950)2026
A skin-kidney neutrophil axis links ultraviolet exposure to renal angiogenesis and tissue remodeling in healthy and lupus kidneys.
Article in Journal of immunology (Baltimore, Md. : 1950), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Neutrophils have been implicated in mediating immune crosstalk between injured tissue and distal organs, either promoting local and distal inflammation or mediating tissue repair. Skin injury from ultraviolet (UV) light triggers neutrophil migration to the kidney, which may have implications for nephritis flares in systemic lupus erythematosus. Here, we demonstrate that after skin exposure to UV light, renal neutrophils upregulate proangiogenic transcriptional programs and activate renal endothelial angiogenesis and tissue remodeling processes in healthy kidneys. Ligand-receptor analysis identified Cd177-Pecam1 as a key neutrophil-endothelial interaction. In contrast to healthy control mice, skin exposure to UV light stimulated the expression of Tgfβ and Wnt signaling pathways in lupus-prone MRL/lpr mice. This tissue remodeling response was neutrophil dependent. Spatial transcriptomic analysis of lupus nephritis kidneys revealed that tissue remodeling and profibrotic pathways are highly expressed in neutrophil-rich areas. Neutrophil intrarenal levels were higher in the kidneys of lupus nephritis patients with active skin disease, compared with those without skin involvement at the time of the nephritis flare. Moreover, urinary neutrophils were increased in systemic lupus erythematosus patients with active skin disease, including sun-associated skin rash, even in the absence of lupus nephritis. These results support a model in which UV-triggered skin injury activates a neutrophil-mediated skin-kidney axis that promotes differential tissue remodeling pathways in healthy compared with lupus-prone kidneys.
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