Histopathological changes of lung tissues in rats (a → d, HE staining, ×100 magnification; e → h HE staining, ×400 magnification. A): Histopathological changes in lung tissues from rats a: normal control group, b: sham operation group, c: control group, d: treatment group, e: normal control group, f: sham operation group; g: control group, h: treatment group. B): Statistical summary of ALI pathology score in rats. ALI pathology scores were expressed as the mean ± SD from triplicate experiments. **P < 0.01; vs the sham operation group; ##P < 0.01; vs the control group.