(A–C), Airway H&E staining on mice from three groups shows significant difference (×200); (D–F), The PAS staining of distinct mice show significant difference; (G–I), MDSCs IHC staining on mice from three groups shows significant difference (×200), arrows indicate positive staining; (J–L), higher magnification of MDSCs IHC staining; (M–O), IL-10 IHC staining on mice from three groups shows significant difference; (P–R), IL-12 IHC staining on mice from three groups shows significant difference (×200); (S–U), TNF-α IHC staining on mice from three groups shows significant difference (×200); (V–X), IL-6 IHC staining on mice from three groups shows significant difference (×200).