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Nicotinamide adenine dinucleotides are abundant soluble cofactors that undergo reversible oxidation and reduction in major metabolic pathways. In cells they are present in oxidized and reduced states as their unphosphorylated (NAD and NADH) and phosphorylated (NADP and NADPH) forms. These dinucleotides work in pairs, and each pair has distinct functions. They have become a point of focus in cancer research because, as metabolites, they can tie metabolic pathways to transcriptional control, epigenetics and cell signaling as cells switch from a normal metabolism to a cancer cell (proliferative) metabolism.




NAD is most often associated with catabolic pathways (glycolysis and oxidative phosphorylation); however its role in the cell involves more than energy metabolism. NAD is an important substrate in several signaling pathways and is involved in the epigenetic control of gene expression. It is the substrate used for ADP ribosylation and has roles in DNA repair , signaling regulation and signaling. The ratio of NAD/NADH influences the activity of many enzymes , especially the glycolytic enzymes.



Amplite® Colorimetric NAD/NADH Ratio Assay Kit (Cat#15273) was used to measure NAD/NADH ratio in a 96-well white wall/clear bottom microplate using a SpectraMax® microplate reader (Molecular Devices). Equal amount of NAD and NADH mixtures were treated with or without NAD extraction solution for 15 minutes, and then neutralized with extraction solution at room temperature. The signal was read at 460 nm. NAD/NADH ratio was calculated based on the absorbance shown in the figure.
NADP/NADPH is the least abundant of the nicotinamide adenine dinucleotide pairs. NADPH is associated with biosynthesis of macromolecules, providing the reducing power necessary for those synthetic reactions. Increased biosynthesis is characteristic of rapidly proliferating cells, such as cancer cells; because of this NADPH is considered a key molecule produced as a result of cancer metabolism. It also has a role in responding to the buildup of Reactive Oxygen Species (ROS).

Monitoring the changes in intracellular levels of these important target-independent metabolites can allow us to better understand the link between altered metabolism and various diseases. Rapid and easy-to-use assays for key metabolites can facilitate these studies.

Product Ordering Information

Table 1. Ordering Info for NAD/NADH Products

Product Name
Unit Size
15257Amplite® Fluorimetric Total NAD and NADH Assay Kit *Red Fluorescence*400 Tests310
15258Amplite® Colorimetric Total NAD and NADH Assay Kit400 Tests310
15261Amplite® Fluorimetric NADH Assay Kit *Red Fluorescence*400 Tests310
15263Amplite® Fluorimetric NAD/NADH Ratio Assay Kit *Red Fluorescence*250 Tests363
15271Amplite® Colorimetric NADH Assay Kit400 Tests258
15273Amplite® Colorimetric NAD/NADH Ratio Assay Kit250 Tests363
15275Amplite® Colorimetric Total NAD and NADH Assay Kit *Enhanced Sensitivity*400 Tests310
15280Amplite® Fluorimetric NAD Assay Kit *Blue Fluorescence*200 Tests363

Table 2. Ordering Info for NADP/NADPH Products

Product Name
Unit Size
15260Amplite® Colorimetric Total NADP and NADPH Assay Kit400 Tests310
15262Amplite® Fluorimetric NADPH Assay Kit *Red Fluorescence*400 Tests310
15264Amplite® Fluorimetric NADP/NADPH Ratio Assay Kit *Red Fluorescence*250 Tests363
15265ReadiUse™ NADPH Regenerating Kit1000 Tests310
15266ReadiUse™ NADP Regenerating Kit200 Tests258
15272Amplite® Colorimetric NADPH Assay Kit400 Tests258
15274Amplite® Colorimetric NADP/NADPH Ratio Assay Kit250 Tests363
15276Amplite® Colorimetric Total NADP and NADPH Assay Kit *Enhanced Sensitivity*400 Tests310
15281Amplite® Fluorimetric NADP Assay Kit *Blue Fluorescence*200 Tests363
15295Cell Meter™ Intracellular NADH/NADPH Fluorescence Imaging Kit *Deep Red Fluorescence*100 Tests520