SERPINE1 and acute respiratory distress syndrome: Recently it was shown that endothelial trans-IL-6 signaling was required for maximum expression of IL-6, IL-8, CCL2 (C–C motif ligand 2) and PAI-1 (plasminogen activator inhibitor-1), all of which are increased in patients with CRS as a result of sepsis, ARDS, burns and SARS-CoV2 infection [290].