Fig. 2

PA-induced lung injury was aggravated following NK cells elimination. a ELISA assay was performed to detect the concentration of TNF-α, IL-1β and IL-10 in lung tissues of each mouse. b The bacterial burden in the right lung tissues of each mouse was analyzed using CFU counting. c The pathological changes in lung tissues were confirmed by H&E staining. The scale bar is 25 μm. d The percentage of neutrophils in lung tissues from each mouse was ensured by flow cytometry. e Flow cytometry was carried out to examine the percentage of lymphocytes in lung tissues from each mouse. **P < 0.01 compared with Control group, both ^#P < 0.05 and ^##P < 0.01 contrasted with PA group