Fig. 5

Increased expression of PD-L1 on neutrophils in PM2.5-exposed mice following infection. (A) Flow cytometric analysis of PD-L1^high neutrophils in the lungs: representative plots of PD-L1^high neutrophils (left), and quantifications are depicted as MFI (upper right) and percentage (lower right). (B) Immunofluorescence images of PD-L1^high neutrophils in mouse lung tissues. The data are shown as means ± SEM. * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001