Abstract
Nicotinamide adenine dinucleotide (NAD(+)) is the universal currency of energy metabolism and electron transfer. Recent studies indicate that apart from its role as a coenzyme, NAD(+) and its metabolites also function in cell signaling pathways; for example, they are substrates for nucleotide-metabolizing enzymes and ligands for extra- and intracellular receptors and ion channels. Moreover, the NAD(+) and NAD(+) phosphate metabolites adenosine 5'-diphosphoribose (ADP-ribose), cyclic ADP-ribose, and nicotinic acid adenine dinucleotide phosphate (NAADP) have emerged as key second messengers in Ca(2+) signaling. A symposium in Hamburg, Germany, brought together 120 researchers from various fields, who were all engaged in the molecular characterization of the key players of NAD(+) signaling (www.NAD2008.de).
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