Nicotinamide adenine dinucleotide redox balance (NAD+/NADH balance)

The **NAD+/NADH balance** refers to the relative concentrations of oxidized nicotinamide adenine dinucleotide (**NAD+**) and its reduced form (**NADH**) within cells. This redox couple is central to energy metabolism, acting as an electron carrier in glycolysis, the citric acid cycle, fatty acid oxidation, and oxidative phosphorylation. The **ratio** between these two forms serves as a key indicator of cellular metabolic state—high ratios favor oxidative reactions necessary for ATP production; low ratios can indicate reductive stress linked to various pathologies such as diabetes and cardiovascular disease[1][2][3]. Dysregulation of this balance affects not only energy production but also gene expression via sirtuins and other enzymes that use NAD+ as a substrate. While modulation of this ratio is an area of therapeutic interest—especially through supplementation with precursors like nicotinamide riboside—the "target" itself is not a single protein or receptor but rather a fundamental property emerging from multiple enzymatic systems across different compartments in the cell[2][3]. Therefore, "NAD+/NADH balance modulation" describes an approach or strategy rather than a discrete molecular target. Additional notes on correctness ("is_incorrect"): The entry "NAD+/NADH balance modulation" does not refer to one specific molecular entity such as an enzyme or receptor; instead it describes manipulation of a biochemical parameter influenced by many proteins. Thus it should not be considered a canonical drug target in the traditional sense—it lacks specificity required for structured pharmacological classification[2][3].

Other names

NAD+ and NADH ratioNAD redox statecellular redox couplenicotinamide adenine dinucleotide ratio

Modulation of cellular NAD+ levels to restore or shift the NAD+/NADH ratio, thereby influencing metabolic and signaling pathways[1][2].