Sivelestat sodium salt (CAS No 150374-95-1) is a serine protease inhibitor primarily used in biomedical research investigating inflammation and sepsis Originating from pharmacological studies aimed at treating acute lung injury it works by inhibiting neutrophil elastase a key enzyme in inflammatory pathways This inhibition helps reduce tissue damage and inflammatory responses In vitro Sivelestat sodium salt exhibits activity in the nanomolar to low micromolar range effectively attenuating enzyme activity It is commonly applied in cell models to investigate inflammatory processes and in animal studies focusing on respiratory diseases Moreover it is utilized in drug screening to evaluate the potential efficacy of new anti-inflammatory compounds Experimental concentrations typically depend on the specific research design ensuring the flexibility needed to align with diverse experimental parameters