NAD+

NAD+ Overview

NAD+ (nicotinamide adenine dinucleotide) is a fundamental coenzyme found in every living cell, central to redox reactions, electron transport, and a broad range of cellular signaling pathways. It functions as a substrate for sirtuins, PARPs, and CD38 enzymes, positioning it at the intersection of metabolic regulation, DNA repair, and cellular aging research.

In research models, NAD+ has been examined for its role in mitochondrial function, sirtuin-mediated deacetylation, age-related NAD+ decline, and cellular energy homeostasis.

Reference: Verdin E. (2015), Science, 350(6265), 1208-1213.

History

NAD+ was first discovered in 1906 by Sir Arthur Harden and William John Young while studying yeast fermentation, though its role wasn’t fully characterized until Otto Warburg’s work in the 1930s established it as a hydrogen-carrying coenzyme. Later research through the mid-20th century revealed its central role in the electron transport chain and glycolysis. The modern era of NAD+ research began in the early 2000s with the identification of sirtuins as NAD+-dependent deacetylases, followed by the discovery of age-related NAD+ decline, which has fueled ongoing interest in the coenzyme as a target of cellular-aging research.

Reference: Imai S. & Guarente L. (2014), Trends in Cell Biology, 24(8), 464-471.

NAD+ Structure

Research Findings

NAD+ has been examined across metabolic, mitochondrial, DNA-repair, and cellular-aging research models. Reported findings describe its role as a sirtuin cofactor in deacetylation reactions, its involvement in PARP-mediated DNA damage response, mitochondrial biogenesis regulation via SIRT1-PGC-1α signaling, and the observed decline of tissue NAD+ levels with advancing age in mammalian models.

Key Areas of Research:

• Sirtuin signaling: SIRT1-SIRT7 deacetylation and metabolic regulation
• Mitochondrial biology: Electron transport, biogenesis, and oxidative phosphorylation
• DNA repair: PARP-1 activity and genomic maintenance
• Cellular aging: Age-related NAD+ decline and rescue models

These findings make NAD+ one of the most widely-studied coenzymes in modern cellular-aging and metabolic research.

References: Yoshino J. et al. (2018), Cell Metabolism, 27(3), 513-528; Rajman L. et al. (2018), Cell Metabolism, 27(3), 529-547.

References

1. Verdin E. (2015). NAD+ in aging, metabolism, and neurodegeneration. Science, 350(6265), 1208-1213.
2. Imai S. & Guarente L. (2014). NAD+ and sirtuins in aging and disease. Trends in Cell Biology, 24(8), 464-471.
3. Yoshino J. et al. (2018). NAD+ intermediates: the biology and therapeutic potential of NMN and NR. Cell Metabolism, 27(3), 513-528.
4. Rajman L. et al. (2018). Therapeutic potential of NAD-boosting molecules: the in vivo evidence. Cell Metabolism, 27(3), 529-547.
5. Camacho-Pereira J. et al. (2016). CD38 dictates age-related NAD decline and mitochondrial dysfunction. Cell Metabolism, 23(6), 1127-1139.