Objective To investigate the effects and mechanisms of endogenous hydrogen sulfide on acute lung injury in- duced by beryllium sulfate ( BeSO4 ) in rats. Methods Forty-eight SPF male SD rats were randomly divided into 4 groups, including a control group, a BeSO4 group, a [ BeSO4 + sodium hydrosulfide (NariS) ] group and a [ BeSO4 + DL-proparg- ylglycine (PPG) ] group (n = 12). The control group was treated with non-exposed intratracheal instillation (0.001 ml/g · BW) of sterile saline, 30 minutes later, intraperitoneal injection (...