Monocytes were isolated from a 30 ml Lithium-heparin-anti-coagulated blood sample in accordance to a previously described protocol [57 (link)]. In particular, Ficoll-based density gradient centrifugation to extract peripheral blood mononuclear cells was followed by magnetic cell sorting (autoMACS, Miltenyi Biotec, Bergisch Gladbach, Germany) using CD14 MicroBeads (Miltenyi Biotec, Bergisch Gladbach, Germany). Purity of the isolated monocytes was ensured by flow cytometry (FACSVerse flow cytometer, BD Bioscience, Heidelberg, Germany) using an anti-human-CD14-FITC antibody (BioLegend, San Diego, USA).
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