ArticleOncoimmunology2025
Membrane IL-18 identifies a human macrophage subset with distinct proteomic and functional traits.
Article in Oncoimmunology, 2025. 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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25 authors.
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Abstract
This study contributes to the characterization of human macrophages in normal and pathological conditions such as cancer. We characterized a macrophage population expressing membrane-associated IL-18 (mIL-18) that shows peculiar proteomic, phenotypic, ultrastructural, and functional properties. mIL-18+ macrophages exhibit increased levels of key proteins involved in pathogen recognition, activation, migration, and endocytosis. They also display specialized functions in vesicle and actin filament transport and lipid metabolism, and have typical mitochondrial traits. Importantly, mIL-18+ cells dominate the peritoneal fluid of adult cancer patients and are present in the bone marrow of children with neuroblastoma. They express high levels of TREM2 but display heterogeneous FOLR2 expression, distinguishing distinct cell subsets with possibly different functions. Accordingly, in primary neuroblastomas, transcriptional signatures associated with mIL-18 expression show different prognostic values. Our data show that mIL-18+ macrophages, which are predominant across the tumor microenvironment, exhibit previously undetected heterogeneity, potentially impacting tumor progression in a variable manner.
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