Is tumour-expressed aminopeptidase N (APN/CD13) structurally and functionally unique?

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Aminopeptidase N (APN/CD13) is a versatile glycoprotein with roles in cellular processes.
• APN activity is linked to cancer progression, suggesting therapeutic potential.
• Ubiquitous expression in normal tissues limits APN as a cancer drug target.

Purpose of the Study:

• To review the literature on Aminopeptidase N (APN/CD13) in cancer.
• To present evidence for unique tumor-expressed APN characteristics.
• To discuss APN's biological roles and therapeutic strategies.

Main Methods:

• Comprehensive literature review.
• Analysis of APN structure, function, and substrate specificity.
• Discussion of preclinical and clinical APN-targeting agents.

Main Results:

• Tumor-expressed APN may differ structurally and functionally from normal APN.
• APN exhibits "moonlighting" roles in both normal physiology and cancer.
• Various APN-targeting strategies have been investigated for cancer treatment.

Conclusions:

• Tumor-specific APN offers potential therapeutic avenues.
• Further research is needed to address unanswered questions regarding APN.
• APN remains a promising target for cancer drug discovery.