To quantify cytokines released in the alveolar in vitro model, ELISA assays were performed. We quantified IL8 with SimpleStep ELISA® Kit (Abcam), TGF-β (Abcam) and IL1β with human IL-1β/IL-1F2 Immunoassay (R&D Systems) was titered using a commercial enzyme-linked immunosorbent assay kit (human IL-1β/IL-1F2 Immunoassay, R&D Systems) following the manufacturer’s instructions and the results were expressed as pg ml-1. All determinations were measure in same session. For IL8 quantification in BAL of COVID-19 patients we referred to already published quantifications (10 (link)).
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