LED treatment reduces leukocytes infiltration without interfers in the mucus production in ARDS experimental model. Groups of mice were induced to ALI by ip injection of LPS and treated or not with LED 2 and 6 h after induction. Non-manipulated and LED treated mice were used as control. After 24 hours of ALI induction the histological analysis was performed. Data mean ± SEM of 6 animals per group. Coloration: (A,C,E) Hematoxylin and eosin, the arrows show the cellular infiltrate in the parenchyma (B,D,F) PAS, the arrows head show the mucus production by hyperplasia of globet cells. Bars = (A,C,E) 50 µm and, (B,D,F) 10 µm.