title: Nanoparticle (NP) uptake by type I alveolar epithelial cells and their oxidant stress response.
abstract: Mammalian cells take up nanoparticles (NPs) and some NPs increase ROS. We use imaging and measure ROS in parallel to evaluate NP-cell interactions with type I-like alveolar epithelial cells exposed to NPs at 1.2 µg/cm(2) . Titanium dioxide (Ti0(2)), gold (Au), silver (Ag), and manganese (Mn) were internalized by R3-1 cells; copper (Cu) NPs were observed at the cell surface only. TiO(2) and Au did not increase cell death but Mn and Cu did, with surviving cells recovering after initial Cu exposure. Ag NPs caused 80% of R3-1 cells to lift off the slides within one hour. Amplex Red was used to report H(2)O(2) production after exposure to 0.4 µg/cm(2) TiO(2), Au, Cu, Mn and Ag. TiO(2), Au, and Ag caused no significant increase in H(2)O(2) while Cu and Mn increased H(2)O(2). NPs that give up electrons, increase ROS production and cause cell death in R3-1 cells.
authors.affiliation: University of Rochester Medical Center, Biochemistry and Biophysics, Box 712, 601 Elmwood Ave, Rochester NY 14620.
authors.forename: Beth A
authors.initials: BA
authors.lastname: Vanwinkle
authors.forename: Karen L
authors.initials: KL
authors.lastname: de Mesy Bentley
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Malecki
authors.forename: Karlene K
authors.initials: KK
authors.lastname: Gunter
authors.forename: Irene M
authors.initials: IM
authors.lastname: Evans
authors.forename: Alison
authors.initials: A
authors.lastname: Elder
authors.forename: Jacob N
authors.initials: JN
authors.lastname: Finkelstein
authors.forename: Günter
authors.initials: G
authors.lastname: Oberdörster
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Gunter