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Junctin and the histidine-rich Ca2+ binding protein: potential roles in heart failure and arrhythmogenesis Pritchard TJ; Kranias EGJ Physiol 2009[Jul]; 587 (Pt 13): 3125-33Contractile dysfunction and ventricular arrhythmias associated with heart failure have been attributed to aberrant sarcoplasmic reticulum (SR) Ca(2+) cycling. The study of junctin (JCN) and histidine-rich Ca(2+) binding protein (HRC) becomes of particular importance since these proteins have been shown to be critical regulators of Ca(2+) cycling. Specifically, JCN is a SR membrane protein, which is part of the SR Ca(2+) release quaternary structure that also includes the ryanodine receptor, triadin and calsequestrin. Functionally, JCN serves as a bridge between calsequestrin and the Ca(2+) release channel, ryanodine receptor. HRC is a SR luminal Ca(2+) binding protein known to associate with both triadin and the sarcoplasmic reticulum Ca(2+)-ATPase, and may thus mediate the crosstalk between SR Ca(2+) uptake and release. Indeed, evidence from genetic models of JCN and HRC indicate that they are important in cardiophysiology as alterations in these proteins affect SR Ca(2+) handling and cardiac function. In addition, downregulation of JCN and HRC may contribute to Ca(2+) cycling perturbations manifest in the failing heart, where their protein levels are significantly reduced. This review examines the roles of JCN and HRC in SR Ca(2+) cycling and their potential significance in heart failure.|Animals[MESH]|Arrhythmias, Cardiac/*etiology/physiopathology[MESH]|Calcium Signaling[MESH]|Calcium-Binding Proteins/chemistry/deficiency/genetics/*physiology[MESH]|Heart Failure/*etiology/physiopathology[MESH]|Humans[MESH]|Membrane Proteins/chemistry/deficiency/genetics/*physiology[MESH]|Mice[MESH]|Mice, Knockout[MESH]|Mixed Function Oxygenases/chemistry/deficiency/genetics/*physiology[MESH]|Models, Cardiovascular[MESH]|Muscle Proteins/chemistry/deficiency/genetics/*physiology[MESH]|Rats[MESH]|Sarcoplasmic Reticulum/physiology[MESH] |
