NAD+ biosynthesis pathway

NAD+ biosynthesis comprises a set of highly conserved metabolic pathways responsible for generating nicotinamide adenine dinucleotide (NAD+), a critical cofactor in redox reactions, energy metabolism, and cellular signaling[1][3]. It involves multiple entry points through precursors such as tryptophan, nicotinamide, nicotinic acid, and nicotinamide riboside, with biosynthetic enzymes including NAMPT, NAPRT, NMNATs, and NRKs[1][3][5]. NAD+ is consumed by a variety of enzymes for processes including DNA repair, epigenetic regulation, and calcium signaling and must be continually replenished[1][3]. The pathway is upregulated in many cancers, which depend on enhanced NAD+ synthesis for rapid growth, making its key enzymes attractive and actively explored therapeutic targets, especially NAMPT[2][3]. Inhibition of NAD+ biosynthesis enzymes is under investigation for cancer and other diseases, while supplementation with NAD+ precursors is studied for anti-aging, neuroprotection, and metabolic health[1][2]. Note: Direct use of "NAD+ biosynthesis" as a target is an overgeneralization; for structured pharmacological or disease targeting, the canonical targets should be specific enzymes, especially NAMPT or NAPRT[2][3]. If structured data is desired for a concrete target, "Nicotinamide phosphoribosyltransferase (NAMPT)" would be more appropriate.

Other names

NAD+ synthesis pathwayNicotinamide adenine dinucleotide biosynthesisNAD biosynthetic pathwayNAD salvage pathwayde novo NAD+ biosynthesisPreiss-Handler pathwayNAD metabolism

Inhibition of NAD+ biosynthesis enzymes (primarily NAMPT) blocks NAD+ production leading to reduced energy metabolism, cell-cycle arrest, and apoptosis in proliferative cells (especially cancer)[2][3]. Supplementation or boosting of NAD+ intermediates (e.g., NMN, NR) can restore NAD+ pools in aging or disease states, improving metabolism, mitochondrial function, and cellular repair[1].