Beyond Energy Metabolism: Exploiting the Additional Roles of NAMPT for Cancer Therapy

Area of Science:

• Oncology
• Molecular Biology
• Pharmacology

Background:

• Tumor cells exhibit heightened NAD+ requirements, increasing reliance on NAD+ production pathways.
• NAMPT (nicotinamide phosphoribosyltransferase) is the rate-limiting enzyme in NAD+ salvage, making it a therapeutic target.
• Early NAMPT inhibitors showed limited clinical efficacy, necessitating novel therapeutic strategies.

Purpose of the Study:

• To review recent findings on NAMPT inhibitors' effects beyond energy metabolism in cancer cells.
• To explore clinical applications of targeting non-metabolic functions affected by NAMPT inhibition.
• To identify strategies for enhancing NAMPT inhibitor efficacy through drug combinations or patient selection.

Main Methods:

• Literature review of preclinical and clinical studies on NAMPT inhibitors in cancer.
• Analysis of recent research on NAMPT inhibitors' impact on sirtuin function, DNA repair, redox homeostasis, signaling, stemness, and immune processes.
• Synthesis of information to propose clinically relevant therapeutic strategies.

Main Results:

• NAMPT inhibitors impact multiple non-metabolic cellular processes in cancer cells, including DNA repair and immune responses.
• Beyond energy metabolism, NAMPT inhibition affects sirtuin activity, redox balance, and cancer stem cell properties.
• These diverse effects present new opportunities for therapeutic intervention.

Conclusions:

• Targeting NAMPT offers potential beyond its metabolic role by affecting critical cancer cell functions.
• Combining NAMPT inhibitors with therapies targeting NAD+-dependent processes may improve outcomes.
• Selecting tumors with specific vulnerabilities for co-targeting with NAMPT inhibitors could enhance therapeutic benefit.