Interaction of TiO nanoparticles with lung fluid proteins and the resulting macrophage inflammatory response

• Published in: Environmental science. Nano 2023-09, Vol.1 (9), p.2427-2436
• Main Authors: Poulsen, Karsten M, Albright, Michaela C, Niemuth, Nicholas J, Tighe, Robert M, Payne, Christine K
• Format: Article
• ISSN: 2051-8153; 2051-8161
• DOI: 10.1039/d3en00179b

Inhalation is a major exposure route to nanoparticles. Following inhalation, nanoparticles first interact with the lung lining fluid, a complex mixture of proteins, lipids, and mucins. We measure the concentration and composition of lung fluid proteins adsorbed on the surface of titanium dioxide (TiO 2 ) nanoparticles. Using proteomics, we find that lung fluid results in a unique protein corona on the surface of the TiO 2 nanoparticles. We then measure the expression of three cytokines (interleukin 6 (IL-6), tumor necrosis factor-alpha (TNF-α), and macrophage inflammatory protein 2 (MIP-2)) associated with lung inflammation. We find that the corona formed from lung fluid leads to elevated expression of these cytokines in comparison to bare TiO 2 nanoparticles or coronas formed from serum or albumin. These experiments show that understanding the concentration and composition of the protein corona is essential for understanding the pulmonary response associated with human exposure to nanoparticles. The interaction of titanium dioxide nanoparticles with lung lining fluid results in a unique protein corona on the surface of the nanoparticles. This protein corona leads to the elevated expression of cytokines associated with lung inflammation.