Protease-antiprotease system (PAS)

The protease-antiprotease system is a complex physiological network consisting of proteolytic enzymes and their corresponding endogenous inhibitors, such as alpha-1 antitrypsin and alpha-2 macroglobulin. This system maintains homeostatic balance by regulating the degradation of soluble and cell-associated proteins and peptides, which is critical for processes like tissue remodeling, blood coagulation, and immune defense. An imbalance in this system, often characterized by excessive protease activity or deficient inhibition, is a hallmark of various pathological conditions, including chronic obstructive pulmonary disease (COPD), cystic fibrosis, and cancer metastasis. While individual components of this system (e.g., specific elastases or metalloproteinases) are frequently targeted by small molecules or biologics, the system as a whole is considered a broad biological mechanism rather than a single therapeutic target. Consequently, the provided name describes a functional category or a mechanism of protein regulation rather than a specific, druggable receptor or enzyme.

Other names

Protease-inhibitor systemSystemic protease and anti-protease complexesProteolytic balance

Not applicable as this is a broad physiological system rather than a single molecular target.