Table 1.

Animal experimental protocol.

Mice	Analysis Items
Batch I (n = 50)	Body weight, lung water content
Batch II (n = 50)	Body weight, bronchoalveolar lavage fluid (BALF) analysis, histopathology, immunofluorescence
Batch III (n = 50)	Body weight, oxidative stress markers, western blot

Mice in each batch were divided into five groups: (i) normal control group, (ii) model group, (iii) high-dose SP group (200 mg/kg), (iv) medium-dose SP group (400 mg/kg), and (v) low-dose SP group (800 mg/kg) (n = 10 for each group).