Cyclic ADP-Ribose: Metabolism and Calcium Mobilizing Function

Hon Cheung Lee, Antony Galione, Timothy F. Walseth

Research output: Contribution to journalArticlepeer-review

132 Scopus citations


This chapter describes the discovery of cyclic adenosine diphosphate–ribose (cADPR) as a novel endogenous Ca2+-mobilizing agent, and the way by which it fulfills most of the criteria necessary for it to be considered a second messenger. The enzymatic pathways for the synthesis and degradation of the metabolite are also summarized. The metabolic pathway of cADPR consists of synthesis from nicotinamide adenine dinucleotide (NAD+) by ADP–ribosyl cyclase and degradation by the cADPR hydrolase to ADP-ribose. CD38-like bifunctional enzymes are responsible for regulating the cellular concentration of cADPR. CD38 is an ecto-enzyme catalyzing the synthesis and the degradation of cADPR raises the possibility that cADPR may have extracellular functions. The properties of its intracellular receptor and the mechanism of its Ca2+-mobilizing activity are discussed. The physiological roles of cADPR in two specific cellular systems are reviewed in the chapter: the sea urchin egg, an invertebrate cell; and the pancreatic β cell, a mammalian system.

Original languageEnglish (US)
Pages (from-to)199-257
Number of pages59
JournalVitamins and Hormones
Issue numberC
StatePublished - Jan 1 1994


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