Fig. 4

a CCK-8 test of A549 cells cultured with gradient concentration Au-TTF-1 for 6 h,12 h and 48 h. b CCK-8 test of Beas-2b cells cultured with gradient concentration Au-TTF-1 for 6 h,12 h and 48 h. (c) Flow cytometry analysis of cellular uptake and the quantified mean FL intensity of A549 cells cultured with gradient concentration Au-TTF-1 for 6 h, 12 h and 24 h. (d) Flow cytometry analysis of cellular uptake and e the Quantified mean FL intensity of A549 cells, Beas-2B cells and H460 cells cultured with 300 μg/mL Au-TTF-1 for 6 h. f Laser scanning confocal micrographs of intracellular distribution in A549 cells after culturing with Au-TTF-1, MitoTracker dyes and dapi, All scale bars are 50 μm