Cyclic ADP-ribose ammonium (cADPR ammonium) is a powerful calcium mobilization second messenger synthesized from NAD+ by an ADP-ribosyl cyclase. It primarily raises cytosolic calcium levels through Ryanodinereceptor-mediated release from the endoplasmic reticulum, while also facilitating extracellular influx through the opening of TRPM2 channels [1][2][3].
ent-(+)-verticilide is an effective and specific inhibitor of cardiac ryanodinereceptor (RyR2) calcium release channels, demonstrating antiarrhythmic properties. It suppresses RyR2-mediated diastolic Ca2+ leak and shows greater potency and a unique action mechanism compared to Dantrolene and Tetracaine. ent-(+)-verticilide serves as a valuable tool for exploring the therapeutic potential of addressing RyR2 hyperactivity in cardiac and neurological conditions [1].