Fig. 4From: Artificial stem cells mediated inflammation-tropic delivery of antiviral drugs for pneumonia treatmentThe evaluation of lysosome escape. MLE-12 cells were pretreated with TNF-α (10 ng/mL) and IFN-γ (10 ng/mL) for 24 h. After incubation with MPD/DiD/FITC or MSCM/PLGA/DiD/FITC for 12 h, the cells were stained with Lysotracker blue and analyzed with CLSMBack to article page