NAD⁺ regulates nucleotide metabolism and genomic DNA replication

Area of Science:

• Biochemistry
• Cell Biology
• Metabolic Regulation

Background:

• Nicotinamide adenine dinucleotide (NAD+) is crucial for metabolic homeostasis and genomic stability.
• Enzymes like PARPs and sirtuins utilize NAD+ for critical cellular functions.
• NAD+ levels are tightly regulated due to their impact on cell viability.

Purpose of the Study:

• To investigate the direct effects of exogenous NAD+ on cellular metabolism.
• To explore the therapeutic potential of NAD+ in combination with other agents for cancer treatment.

Main Methods:

• Short-term and extended incubation of cells with exogenous NAD+.
• Analysis of mitochondrial activity, nucleotide biosynthesis, and cell cycle progression.
• Evaluation of combined NAD+ and 5-fluorouridine treatment on cancer cells.

Main Results:

• Exogenous NAD+ directly enhances mitochondrial activity and pyrimidine biosynthesis in the short term.
• Extended NAD+ exposure leads to pyrimidine depletion, purine accumulation, and cell cycle arrest.
• Combined NAD+ and 5-fluorouridine selectively eliminates cancer cells dependent on de novo pyrimidine synthesis.

Conclusions:

• NAD+ plays a significant role in regulating nucleotide metabolism.
• NAD+ exhibits dual effects on cellular metabolism depending on exposure duration.
• NAD+ combined with 5-fluorouridine presents a promising strategy for cancer therapy.