IP3 signaling in cardiac atria and the sinoatrial node involves stimulation of Ca2+-activated adenylyl cyclases (AC1 and AC8) by IP3-evoked Ca2+ release from junctional sarcoplasmic reticulum.
IP3-mediated Ca2+ release regulates atrial Ca2+ transients and pacemaker function by stimulating Ca2+-activated adenylyl cyclases (AC1 and AC8), providing mechanistic insights relevant to atrial fibrillation.
This study provides evidence supporting the proposal that IP 3 signaling in cardiac atria and sinoatrial node involves stimulation of Ca 2+ -activated adenylyl cyclases (AC1 and AC8) by IP 3 -evoked Ca 2+ release from junctional sarcoplasmic reticulum. AC8 and IP 3 receptors are shown to be located close together, while AC1 is nearby. Greater understanding of these novel aspects of the IP 3 signal transduction mechanism is important for future study in atrial physiology and pathophysiology, particularly atrial fibrillation.
Capel et al. (Fri,) conducted a other in Atrial physiology and pathophysiology. IP3 signaling was evaluated on Stimulation of Ca2+-activated adenylyl cyclases by IP3-evoked Ca2+ release. IP3 signaling in cardiac atria and the sinoatrial node involves stimulation of Ca2+-activated adenylyl cyclases (AC1 and AC8) by IP3-evoked Ca2+ release from junctional sarcoplasmic reticulum.
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