Particulate matter phagocytosis induces tissue factor in differentiating macrophages
M. Milano, P. Dongiovanni, A. Artoni, S. Gatti, L. Rosso, F. Colombo, V. Bollati, M. Maggioni, P. M. Mannucci, P. A. Bertazzi, S. Fargion and L. Valenti
Article first published online: 8 APR 2015 | DOI: 10.1002/jat.3156
Here we show that in human differentiating macrophages, particulate matter with diameter < 10 mcM (PM10) exposure induces tissue factor (TF) and a procoagulant phenotype. This process is dependent on phagocytosis and the activation of stress pathways, and is abolished in differentiated anti-inflammatory macrophages. In rats, alveolar exposure to PM10 causes the recruitment of inflammatory cells and results in local induction of TF, increasing circulating TF levels. TF induction by differentiating lung macrophages, activated following phagocytosis, contributes to the increased risk of thromboembolic complications associated with PM10 exposure.