Activation of IPR in atrial cardiomyocytes leads to generation of cytosolic cAMP.

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia. Excessive stimulation of the inositol (1,4,5)-trisphosphate (IP) signaling pathway has been linked to AF through abnormal calcium handling. However, little is known about the mechanisms involved in this process.