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Extracellular vesicles including exosomes are nano-sized entities released from all cell types. Previous studies of exosomes from bronchoalveolar lavage fluid (BALF) of sarcoidosis patients have revealed pro-inflammatory components and abilities, but cell sources and mechanisms have not been identified. In the current study, we found that BALF exosomes from sarcoidosis patients, but not from healthy individuals, induced a dose-dependent elevation of intracellular IL-1\u03b2 in monocytes. Analyses of supernatants showed that patient exosomes also induced release of IL-1\u03b2, IL-6 and TNF from both PBMCs and enriched monocytes, suggesting that the observed effect is direct on monocytes. The potently chemotactic chemokine\u00a0CCL2 was induced by exosomes from a subgroup of patients, and in a blocking assay the exosome-induced CCL2 was reduced for 13 out of 19 patients by the asthma drug Montelukast, a cysteinyl leukotriene receptor antagonist. Further, reactive oxygen species generation by PBMCs was induced to a higher degree by patient exosomes compared to healthy exosomes. These findings add to an emerging picture of exosomes as mediators and disseminators of inflammation, and open for further investigations of the link between CCL2 and exosomal leukotrienes in sarcoidosis.<\/jats:p>","DOI":"10.1038\/s41598-020-72067-7","type":"journal-article","created":{"date-parts":[[2020,9,18]],"date-time":"2020-09-18T10:15:41Z","timestamp":1600424141000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Sarcoidosis exosomes stimulate monocytes to produce pro-inflammatory cytokines and CCL2"],"prefix":"10.1038","volume":"10","author":[{"given":"Casper J. 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