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Treatment is needed when disease symptoms worsen and organ function deteriorates. In pulmonary sarcoidosis, prednisone and methotrexate (MTX) are the most common anti-inflammatory therapies. However, there is large inter-patient variability in response to treatment, and predictive response markers are currently lacking.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Objective<\/jats:title>\n                <jats:p>In this study, we investigated the predictive potential of biomarkers in extracellular vesicles (EVs) isolated from biobanked serum of patients with pulmonary sarcoidosis stored prior to start of therapy.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Protein concentrations of a four-protein test panel of inflammatory proteins were measured in a discovery (<jats:italic>n<\/jats:italic>\u2009=\u200916) and replication (<jats:italic>n<\/jats:italic>\u2009=\u2009129) cohort of patients with sarcoidosis and 47 healthy controls. Response to therapy was defined as an improvement of the absolute score of &gt;\u20095% forced vital capacity (FVC) and\/or\u2009&gt;\u200910% diffusion lung of carbon monoxide (DLCO) after 24\u2009weeks compared to baseline (before treatment).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Serum protein levels differed between EV fractions and serum, and between sarcoidosis cases and controls. Serpin C1 concentrations in the low density lipid particle EV fraction were lower at baseline in the group of patients with a good response to MTX treatment in both the discovery cohort (<jats:italic>p<\/jats:italic>\u2009=\u20090.059) and in the replication cohort (<jats:italic>p<\/jats:italic>\u2009=\u20090.032). EV Serpin C1 showed to be a significant predictor for response to treatment with MTX (OR 0.4; <jats:italic>p<\/jats:italic>\u2009=\u20090.032).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>This study shows that proteins isolated from EVs harbor a distinct signal and have potential as new predictive therapy response biomarkers in sarcoidosis.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12931-024-02809-y","type":"journal-article","created":{"date-parts":[[2024,4,16]],"date-time":"2024-04-16T06:01:58Z","timestamp":1713247318000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Decreased serpin C1 in extracellular vesicles predicts response to methotrexate treatment in patients with pulmonary sarcoidosis"],"prefix":"10.1186","volume":"25","author":[{"given":"Raisa","family":"Kraaijvanger","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Montse","family":"Janssen Bon\u00e1s","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan C.","family":"Grutters","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ioanna","family":"Paspali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcel","family":"Veltkamp","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominique P. 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