Neutrophil elastase (NE) (ELANE)

Neutrophil elastase (NE) is a potent serine protease primarily stored within the azurophilic granules of neutrophils and released during inflammatory responses. Its primary biological function involves the degradation of foreign proteins and the destruction of pathogens, contributing significantly to the innate immune response and the formation of neutrophil extracellular traps (NETs). Under physiological conditions, its activity is tightly regulated by endogenous inhibitors like alpha-1 antitrypsin to prevent collateral damage to host tissues. However, an imbalance between NE and its inhibitors leads to excessive proteolysis of extracellular matrix components, such as elastin and collagen, resulting in significant tissue destruction. This pathological process is a hallmark of several chronic and acute respiratory diseases, including chronic obstructive pulmonary disease (COPD), cystic fibrosis, and acute respiratory distress syndrome (ARDS). Consequently, NE is a major therapeutic target, with various synthetic inhibitors like sivelestat and alvelestat developed to mitigate inflammatory tissue damage. Therapeutic challenges include maintaining the protease-antiprotease balance without compromising the patient's ability to clear infections.

Other names

Granulocyte elastaseLeukocyte elastasePolymorphonuclear leukocyte elastasePMN elastaseElastase-2MedullasinBone marrow serine proteaseHuman leukocyte elastase (HLE)Human neutrophil elastase (HNE)

Inhibition of proteolytic activity through competitive, non-competitive, or allosteric binding to the enzyme's active site or regulatory domains.