Abstract：
: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.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Vu CQ,Coyle DL,Tai HH,Jacobson EL,Jacobson MKsubject
Has Abstractpub_date
1997-01-01 00:00:00pages
381-8eissn
0065-2598issn
2214-8019journal_volume
419pub_type
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