Metabolic
NAD +
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme investigated for its role in cellular redox reactions, mitochondrial function, and sirtuin-mediated signaling pathways. This preparation is intended strictly for laboratory research use only and is not for human or animal consumption. Each lot is verified at ≥99% purity by HPLC and confirmed by LC-MS to support reproducible experimental results.
Mechanism of Action
Research indicates that NAD+ operates through two broad categories of activity. As a redox coenzyme, it accepts and donates electrons in metabolic reactions central to glycolysis, the tricarboxylic acid cycle, fatty acid oxidation, and oxidative phosphorylation, interconverting between NAD+ and NADH without being consumed. In this capacity, studies describe it as a mobile electron carrier that links catabolic pathways to mitochondrial ATP generation, positioning cellular NAD+/NADH ratios as an investigated index of metabolic state.
In addition to redox roles, research has identified NAD+ as a consumable substrate for non-redox enzymes, including sirtuins (NAD+-dependent deacylases), poly(ADP-ribose) polymerases (PARPs) implicated in DNA-damage responses, and the ADP-ribosyl cyclases CD38 and CD157. These reactions cleave NAD+ and release nicotinamide, which studies suggest is recycled back to NAD+ largely through the NAD+ salvage pathway, in which nicotinamide phosphoribosyltransferase (NAMPT) catalyzes a rate-limiting step and NMN adenylyltransferases (NMNATs) complete regeneration. Research literature frames the balance between NAD+ biosynthesis, salvage, and consumption as a subject of ongoing mechanistic investigation.
Research Applications
- → Research characterizes NAD+ as an obligatory redox coenzyme that cycles between NAD+ and NADH to shuttle electrons across glycolysis, the TCA cycle, and oxidative phosphorylation.
- → Studies describe NAD+ as a consumable substrate for sirtuins, PARPs, and CD38/CD157, linking its cellular abundance to enzymatic signaling in addition to redox chemistry.
- → Preclinical literature reports that NAD+ is continuously regenerated through the salvage pathway, with NAMPT identified as a rate-limiting enzyme in recycling nicotinamide.
- → Research in model organisms has observed a gradual decline in tissue and cellular NAD+ levels associated with advancing age.
- → Mechanistic studies investigate NAD+ compartmentalization across mitochondrial, nuclear, and cytosolic pools and how these pools are maintained and buffered.
Analytical Validation
NAD + is verified via LC-MS and HPLC analysis. Each lot is tested for identity, purity (≥99% target), and endotoxin levels. Full certificate of analysis is available upon request.
