MPO and acute respiratory distress syndrome: Herein, the study established LPS-stimulated ALI model within BALB/c mice, treated or non-treated with EGCG, and examined the changes in pathological characteristics, lung injury scores, cell numbers, the activity of myeloperoxidase (MPO), wet-to-dry weight ratio of lung tissues and inflammation cytokine levels within BALF to examine LPS-stimulated ALI and the protective effects of EGCG.