Description

Nicotinamide adenine dinucleotide (NAD+) is a crucial coenzyme involved in various metabolic processes, including glycolysis, β-oxidation, and oxidative phosphorylation. It also plays a significant role in post-translational modifications such as ADP-ribosylation and deacetylation, which are essential for energy metabolism, DNA repair, gene expression, and stress response.

NAD+ Description

NAD+ is a coenzyme involved in redox reactions and cellular metabolism. It has gained attention for its role as a signaling molecule, influencing processes such as energy metabolism, cell survival, and aging. NAD+ levels decline with age, leading to altered metabolism and increased disease susceptibility, which has spurred interest in NAD+-boosting molecules to enhance health and longevity.

NAD+ (Nicotinamide Adenine Dinucleotide):

NAD+ is a coenzyme that plays a central role in cellular energy metabolism and is essential for various biochemical processes, including DNA repair, gene expression, and mitochondrial function. As a vital molecule involved in redox reactions, NAD+ facilitates the transfer of electrons between molecules, enabling cells to generate ATP (adenosine triphosphate), the primary energy source for cellular activities. NAD+ has garnered significant attention in research for its potential applications in aging, neurodegenerative diseases, metabolic health, and overall cellular function.

NAD+ Research

NAD+ is involved in redox reactions and serves as a cofactor for various enzymes, including sirtuins and poly(ADP-ribose) polymerases. It plays a significant role in cellular processes such as metabolism, DNA repair, and chromatin remodeling, which are vital for maintaining tissue and metabolic homeostasis. A decline in NAD+ levels is observed with aging, contributing to age-associated diseases like cognitive decline, cancer, and metabolic disorders.

Aging and Longevity

NAD+ plays a significant role in aging and longevity. Research indicates that restoring NAD+ levels in aged or diseased animals can promote health and extend lifespan. This has led to the exploration of NAD+ precursors like nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), which have shown promise in ameliorating age-associated pathophysiologies.¹

CD38, an NADase, plays a central role in age-related NAD+ decline. Inhibiting CD38 with specific inhibitors like 78c has been shown to reverse NAD+ decline and improve metabolic and physiological parameters in aging models. This includes enhanced glucose tolerance, muscle function, and cardiac performance. The increase in NAD+ levels activates pro-longevity factors such as sirtuins and AMPK, while inhibiting pathways like mTOR-S6K that negatively affect healthspan. This pharmacological strategy highlights the potential of targeting NAD+ metabolism to prevent or reverse age-related metabolic dysfunction.²

Metabolic Disorders

Alterations in NAD+ metabolism are closely linked to the development of metabolic disorders such as diabetes, obesity, and non-alcoholic fatty liver disease (NAFLD). NAD+ levels tend to decrease with aging and under conditions of nutrient disturbance, contributing to these disorders.³ The imbalance in NAD+/NADH ratios can lead to impaired cellular stress responses and metabolic dysfunctions, which are characteristic of metabolic diseases.⁴

Cardiovascular Diseases

Aging and metabolic stress are associated with a decline in NAD+ levels, which can lead to mitochondrial dysfunction and increased susceptibility to cardiovascular diseases.⁵ This depletion is linked to major risk factors such as obesity and hypertension, which contribute to the development of conditions like atherosclerosis and cardiomyopathies.⁶ The loss of NAD+ with age or stress underscores the importance of maintaining NAD+ levels to prevent cardiovascular dysfunction.⁷

Neurodegenerative Disorders

NAD+ participates in redox reactions and NAD+-dependent signaling processes, which are essential for modulating mitochondrial function and reducing oxidative stress, a common feature in neurodegenerative diseases. The activation of NAD+-dependent pathways can enhance cellular resilience against oxidative damage, which is crucial for maintaining neuronal health.⁸ Additionally, NAD+ influences axonal maintenance and viability, with its metabolism being a target for therapeutic interventions in neurological diseases.⁹

Research suggests that increasing NAD+ availability can ameliorate mitochondrial dysfunction and reduce neuroinflammation. This has been demonstrated in models of Parkinson’s disease, Alzheimer’s disease, and ALS, where NAD+ enhancement improved mitochondrial function, reduced neuroinflammation, and enhanced cognitive and synaptic functions. The Sirt1/PGC-1α pathway is one mechanism through which NAD+ exerts its protective effects, highlighting its potential as a therapeutic target.¹⁰

Mitochondrial Function

NAD+ metabolism is intricately linked to mitochondrial function. It acts as a substrate for sirtuins, a family of NAD+-dependent deacylases, which are key regulators of mitochondrial homeostasis. Increased NAD+ levels and sirtuin activation have been associated with improved mitochondrial function, organismal metabolism, and lifespan across various species.¹¹

The source and transport of NAD+ within mitochondria have been subjects of debate. Recent studies have identified SLC25A51 as a mammalian mitochondrial NAD+ transporter, which is essential for maintaining mitochondrial NAD+ pools and respiratory function.¹² The de novo synthesis of NAD+ has been shown to enhance mitochondrial function, with enzymes like ACMSD playing a critical role in regulating cellular NAD+ levels and sirtuin activity.¹¹

Cancer Research

Cancer cells exhibit a unique metabolic phenotype known as the Warburg effect, characterized by increased glycolysis even in the presence of oxygen, which is supported by elevated NAD+ levels.¹² The NAD+ salvage pathway is particularly important in cancer cells, as it is the primary method of NAD+ synthesis, and its inhibition has been shown to induce cancer cell cytotoxicity.¹³

NAD+ metabolism is not only crucial within cancer cells but also affects the tumor microenvironment. NAD+ and its metabolites can influence immune responses and contribute to the creation of an immunosuppressive tumor microenvironment.¹⁴ Enzymes such as CD38, which consume NAD+, are involved in producing immunosuppressive metabolites like adenosine, further impacting cancer progression and immune evasion.¹⁵

Targeting NAD+ metabolism presents a promising strategy for cancer treatment. Inhibitors of NAD+ biosynthesis, particularly those targeting nicotinamide phosphoribosyltransferase (NAMPT), have shown potential in preclinical models, although resistance mechanisms such as alternative NAD+ biosynthetic pathways can limit their effectiveness.¹⁶

References

1. Rajman, L., Chwalek, K., & Sinclair, D. (2018). Therapeutic Potential of NAD-Boosting Molecules: The In Vivo Evidence.. Cell metabolism, 27 3, 529-547 . https://doi.org/10.1016/j.cmet.2018.02.011.
2. Tarragó, M., Chini, C., Kanamori, K., Warner, G., Caride, A., De Oliveira, G., Rud, M., Samani, A., Hein, K., Huang, R., Jurk, D., Cho, D., Boslett, J., Miller, J., Zweier, J., Passos, J., Doles, J., Becherer, D., &Chini, E. (2018). A Potent and Specific CD38 Inhibitor Ameliorates Age-Related Metabolic Dysfunction by Reversing Tissue NAD+ Decline.. Cell metabolism, 27 5, 1081-1095.e10 . https://doi.org/10.1016/j.cmet.2018.03.016.
3. Okabe, K., Yaku, K., Tobe, K., & Nakagawa, T. (2019). Implications of altered NAD metabolism in metabolic disorders. Journal of Biomedical Science, 26. https://doi.org/10.1186/s12929-019-0527-8.
4. Amjad, S., Nisar, S., Bhat, A., Shah, A., Frenneaux, M., Fakhro, K., Haris, M., Reddy, R., Patay, Z., Baur, J., & Bagga, P. (2021). Role of NAD+ in regulating cellular and metabolic signaling pathways. Molecular Metabolism, 49. https://doi.org/10.1016/j.molmet.2021.101195.
5. Rotllan, N., Camacho, M., Tondo, M., Diarte-Añazco, E., Canyelles, M., Méndez-Lara, K., Benítez, S., Alonso, N., Mauricio, D., Escolà-Gil, J., Blanco-Vaca, F., &Julve, J. (2021). Therapeutic Potential of Emerging NAD+-Increasing Strategies for Cardiovascular Diseases. Antioxidants, 10. https://doi.org/10.3390/antiox10121939.
6. Abdellatif, M., Sedej, S., & Kroemer, G. (2021). NAD+ Metabolism in Cardiac Health, Aging, and Disease.. Circulation, 144 22, 1795-1817 . https://doi.org/10.1161/CIRCULATIONAHA.121.056589.
7. Lin, Q., Zuo, W., Liu, Y., Wu, K., & Liu, Q. (2021). NAD+ and Cardiovascular Diseases.. Clinicachimica acta; international journal of clinical chemistry. https://doi.org/10.1016/j.cca.2021.01.012.
8. Pehar, M., Harlan, B., Killoy, K., & Vargas, M. (2017). Nicotinamide Adenine Dinucleotide Metabolism and Neurodegeneration.. Antioxidants & redox signaling, 28 18, 1652-1668 . https://doi.org/10.1089/ars.2017.7145.
9. Alexandris, A., &Koliatsos, V. (2023). NAD+, Axonal Maintenance, and Neurological Disease. Antioxidants & Redox Signaling, 39, 1167 – 1184. https://doi.org/10.1089/ars.2023.0350.
10. Zhao, Y., Zhang, J., Zheng, Y., Zhang, Y., Zhang, X., Wang, H., Du, Y., Guan, J., Wang, X., & Fu, J. (2021). NAD+ improves cognitive function and reduces neuroinflammation by ameliorating mitochondrial damage and decreasing ROS production in chronic cerebral hypoperfusion models through Sirt1/PGC-1α pathway. Journal of Neuroinflammation, 18. https://doi.org/10.1186/s12974-021-02250-8.
11. Katsyuba, E., Mottis, A., Ziętak, M., De Franco, F., Van Der Velpen, V., Gariani, K., Ryu, D., Cialabrini, L., Matilainen, O., Liscio, P., Giacchè, N., Stokar-Regenscheit, N., Legouis, D., De Seigneux, S., Ivanisevic, J., Raffaelli, N., Schoonjans, K., Pellicciari, R., &Auwerx, J. (2018). De novo NAD+ synthesis enhances mitochondrial function and improves health. Nature, 563, 354 – 359. https://doi.org/10.1038/s41586-018-0645-6.
12. Luongo, T., Eller, J., Lu, M., Niere, M., Raith, F., Raith, F., Perry, C., Bornstein, M., Oliphint, P., Wang, L., McReynolds, M., Migaud, M., Rabinowitz, J., Johnson, F., Johnsson, K., Johnsson, K., Ziegler, M., Cambronne, X., & Baur, J. (2020). SLC25A51 is a mammalian mitochondrial NAD+ transporter. Nature, 588, 174 – 179. https://doi.org/10.1038/s41586-020-2741-7.
13. Yaku, K., Okabe, K., Hikosaka, K., & Nakagawa, T. (2018). NAD Metabolism in Cancer Therapeutics. Frontiers in Oncology, 8. https://doi.org/10.3389/fonc.2018.00622.
14. Kennedy, B., Sharif, T., Martell, E., Dai, C., Kim, Y., Lee, P., & Gujar, S. (2016). NAD+ salvage pathway in cancer metabolism and therapy.. Pharmacological research, 114, 274-283 . https://doi.org/10.1016/j.phrs.2016.10.027.
15. Audrito, V., Managò, A., Gaudino, F., Sorci, L., Messana, V., Raffaelli, N., &Deaglio, S. (2019). NAD-Biosynthetic and Consuming Enzymes as Central Players of Metabolic Regulation of Innate and Adaptive Immune Responses in Cancer. Frontiers in Immunology, 10. https://doi.org/10.3389/fimmu.2019.01720.
16. Myong, S., Nguyen, A., & Challa, S. (2024). Biological Functions and Therapeutic Potential of NAD+ Metabolism in Gynecological Cancers. Cancers, 16. https://doi.org/10.3390/cancers16173085.
17. Ghanem, M., Caffa, I., Monacelli, F., &Nencioni, A. (2024). Inhibitors of NAD+ Production in Cancer Treatment: State of the Art and Perspectives. International Journal of Molecular Sciences, 25. https://doi.org/10.3390/ijms25042092.

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