Cathepsin S

Cathepsin S is an enzyme, a type of protein that helps break down other proteins in the body. It is mainly found in immune cells called macrophages and dendritic cells, where it aids in processing parts of pathogens so the immune system can recognize and respond to infections. Additionally, Cathepsin S plays a role in normal cellular functions like membrane recycling and tissue remodeling. While essential for health, if its activity becomes unbalanced, it may contribute to inflammatory diseases or conditions like autoimmune disorders.