Fibroblast activation protein-α: a key modulator of the microenvironment in multiple pathologies

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Fibroblast activation protein-α (FAP) is a transmembrane serine protease.
• FAP expression is largely restricted to activated fibroblasts at pathologic sites in adults, not normal tissues.
• Its extracellular location makes it accessible for targeted therapies.

Purpose of the Study:

• To review the structure, substrate specificities, and signaling functions of FAP.
• To discuss the design and clinical potential of FAP inhibitors.
• To explore FAP's roles in cancer, fibrosis, arthritis, and other pathologies.

Main Methods:

• Literature review of FAP structure, function, and inhibitors.
• Analysis of evidence for FAP presence in various diseases.
• Discussion of FAP's role in cancer stromal response, angiogenesis, and immune modulation.

Main Results:

• FAP is implicated in facilitating cell invasion and growth in multiple cancers and fibrotic conditions.
• FAP plays a role in cancer-associated angiogenesis and potentially modulates antitumor immune responses.
• Evidence supports FAP's presence in arthritis, keloids, and wound healing.

Conclusions:

• FAP inhibitors represent a promising therapeutic and diagnostic strategy for FAP-expressing pathologies.
• Further research is needed to fully elucidate FAP's functions and optimize therapeutic applications.
• Understanding FAP's role in the tumor microenvironment is crucial for developing effective cancer treatments.