NAD+ and Cellular Energy Metabolism: A Research Summary
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NAD+
The Role of NAD+ in Cellular Metabolism
Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in all living cells. It functions as an electron carrier in metabolic reactions, cycling between its oxidised (NAD+) and reduced (NADH) forms. NAD+ is essential for glycolysis, the citric acid cycle, and oxidative phosphorylation.
Sirtuin Activation
Beyond its role as an electron carrier, NAD+ is a required substrate for sirtuins (SIRT1–7), a family of NAD+-dependent deacylases. Sirtuins regulate a wide range of cellular processes including gene expression, DNA repair, mitochondrial biogenesis, and stress responses. Research has shown that NAD+ availability is a rate-limiting factor for sirtuin activity.
PARP Enzymes and DNA Repair
Poly(ADP-ribose) polymerases (PARPs) are another major class of NAD+-consuming enzymes. PARPs are activated by DNA strand breaks and play a critical role in the DNA damage response. High PARP activity can deplete cellular NAD+ pools, creating a potential link between DNA damage, NAD+ levels, and cellular energy status.
Age-Related NAD+ Decline
Multiple studies have documented a decline in tissue NAD+ levels with age in both animal models and human tissue samples. This observation has driven significant research interest in NAD+ precursor supplementation (NMN, NR) as a tool for studying age-related metabolic changes.
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