Cyclic ADP-ribose ammonium (cADPR ammonium) is a potent second messenger for calcium mobilization that is synthesized from NAD+ by an ADP-ribosyl cyclase. Cyclic ADP-ribose ammonium increases cytosolic calcium mainly by Ryanodine receptor-mediated release from endoplasmic reticulum and also by extracellular influx through the opening of TRPM2 channels[1][2][3].

cADPR (20 nM) elicits a large rapid Ca2+ release in sea urchin eggs homogenates[1].cADPR (100 μM; 10 min) induces a sustained elevation of intracellular calcium concentration in a subset (64%) of cultured astrocytes[4].cADPR (100 μM) and heat (35-38.5 ℃) stimulates oxytocin OT release from the isolated hypothalami of male mice in culture[5].

cADPR (100 μM; push-pull type of brain microperfusion) elevats OT concentrations in ordinate or subordinate mice[5].

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