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Evidence suggests that β-Adrenergic receptor signaling increases heart rate and force through not just cyclic AMP but also the Ca(2+)-releasing second messengers NAADP (nicotinic acid adenine dinucleotide phosphate) and cADPR (cyclic ADP-ribose). Nevertheless, proof of the physiological relevance of these messengers requires direct measurements of their levels in response to receptor stimulation. Here we report that in intact Langendorff-perfused hearts β-adrenergic stimulation increased both messengers, with NAADP being transient and cADPR being sustained. Both NAADP and cADPR have physiological and therefore pathological relevance by providing alternative drug targets in the β-adrenergic receptor signaling pathway.

Original publication




Journal article


Biochem Biophys Res Commun

Publication Date





326 - 329


Adrenergic beta-Agonists, Animals, Cyclic ADP-Ribose, Guinea Pigs, Heart, In Vitro Techniques, Myocardium, NADP, Receptors, Adrenergic, beta, Signal Transduction