C3 and acute respiratory distress syndrome: The present results demonstrated that PLE showed potential effects in relieving ALI and preventing oxidative stress, reflected in the decreasing the serum levels of C3, hs-CRP, and GGT, decreasing the pulmonary levels of TNF-α, IL-1β, and IL-6, increasing the pulmonary activities of SOD and CAT, as well as downregulating the MDA contents, respectively.