Fig. 6From: Involvement of lysosomal dysfunction in silver nanoparticle-induced cellular damage in A549 human lung alveolar epithelial cellsEffects of bafilomycin A1 treatment on Ag dissolution and metallothionein expression following exposure to AgNPs. A549 cells were incubated in culture medium with or without 200 nM BFA1 for 24 h before treating with AgNPs (50 μg Ag/ml) for an additional 24 h. a Ag concentrations in the soluble (left) and insoluble fractions (right). Values (ng/104 cells) are mean ± standard deviation (n = 3). b mRNA levels of MT-I (left) and MT-II (right). Total RNA was isolated and subjected to real-time PCR analysis using MT-I or MT-II gene-specific primers. Each value (mean ± standard deviation, n = 3) was normalized to the GAPDH level, and the control value (cells without BFA1 and AgNPs) was set to 1. **P < 0.01 compared to cells without BFA1 and with AgNPsBack to article page