It's a Trap!-Potential of Cathepsins in NET Formation.

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• Neutrophils are key innate immune cells, utilizing migration, phagocytosis, and neutrophil extracellular trap (NET) formation for host defense.
• Dysregulated NET formation contributes to pathological inflammation and various diseases.
• Cathepsins, proteolytic enzymes, are increasingly recognized as critical regulators of neutrophil functions.

Purpose of the Study:

• To review the role of cathepsins in modulating neutrophil effector functions.
• To highlight the dual role of cathepsins in host defense and disease pathology.
• To discuss cathepsins as potential therapeutic targets for NET-driven inflammation.

Main Methods:

• Literature review synthesizing current evidence on cathepsin-mediated neutrophil regulation.
• Analysis of the mechanisms by which serine and cysteine cathepsins influence neutrophil migration, phagocytosis, and NET formation.
• Exploration of the link between lysosomal proteolysis and specialized immune responses.

Main Results:

• Serine cathepsins (e.g., cathepsin G) and cysteine cathepsins (e.g., cathepsin C) are vital for neutrophil migration, chemokine processing, and protease maturation.
• Cathepsins influence NET formation, connecting lysosomal functions to immune responses.
• Aberrant cathepsin activity contributes to inflammatory diseases.

Conclusions:

• Cathepsins play a pivotal role in orchestrating neutrophil-mediated immunity and inflammation.
• Targeting cathepsins presents a promising therapeutic strategy for autoimmune diseases, cancer metastasis, and ischemia-reperfusion injury.
• Further research into cathepsin function can unlock new treatments for inflammatory disorders.