NAD precursors, mitochondria targeting compounds and ADPribosylation inhibitors in treatment of inflammatory diseases and cancer

Mitochondrial dysfunction and oxidative stress are prominent features of a plethora of human disorders. Dysregulation of mitochondrial functions represents a common pathogenic mechanism of diseases such as neurodegenerative disorders and cancer. The maintenance of the Nicotinamide adenine dinucleotide (NAD+ ) pool, and a positive NAD+ /NADH ratio, are essential for mitochondrial and cell functions. The synthesis and degradation of NAD+ and transport of its key intermediates among cell compartments play an important role to maintain optimal NAD levels, for regulation of NAD+ -utilizing enzymes, such as sirtuins (Sirt), poly-ADP-ribose polymerases, and CD38/157 enzymes, either intracellularly as well as extracellularly. In this review, we present and discuss the links between NAD+ , NAD+ -consuming enzymes, mitochondria functions, and diseases. Attempts to treat various diseases with supplementation of NAD+ cycling intermediates and inhibitors of sirtuins and ADP-ribosyl transferases may highlight a possible therapeutic approach for therapy of cancer and neurodegenerative diseases.