Intramolecular ADP-ribose transfer reactions result in the formation of cyclic ADP-ribose (cADPR) and 2'-phospho-cyclic ADP-ribose (P-cADPR) from NAD and NADP, respectively. The potent Ca2+ releasing activity of these cyclic nucleotides has led to the postulation that they function as second messengers of Ca2+ signalling. The synthesis and hydrolysis of cADPR and P- cADPR are catalyzed by NAD(P) glycohydrolases, but the metabolic signals that regulate their metabolism are poorly understood. To investigate the physiological roles of cADPR and P-cADPR, it is essential to have methods that allow the routine measurement of these nucleotides in cellular systems. As described here, a sensitive and selective radioimmunoassay (RIA) for cADPR has been adapted to search for the natural occurrence of P-cADPR in mammalian tissues. Perchloric acid extracts prepared from bovine tissues and purified by anion exchange chromatography were found to contain immunoreactive material which was identified as P-cADPR. P-cADPR may play an important role in oxidative stress as a link between NADP(H) metabolism and alteration of intracellular Ca2+ homeostasis.
CITATION STYLE
Vu, C. Q., Coyle, D. L., Tai, H. H., Jacobson, E. L., & Jacobson, M. K. (1997). Intramolecular ADP-ribose transfer reactions and calcium signalling: Potential role of 2’-phospho-cyclic ADP-ribose in oxidative stress. In Advances in Experimental Medicine and Biology (Vol. 419, pp. 381–388). Springer New York LLC. https://doi.org/10.1007/978-1-4419-8632-0_50
Mendeley helps you to discover research relevant for your work.