Ryanodine receptors and ventricular arrhythmias: Emerging trends in mutations, mechanisms and therapies
| Autor: | Christopher H. George, N. Lowri Thomas, Hala Jundi, F. Anthony Lai, Debra L. Fry |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Tachycardia
medicine.medical_specialty medicine.disease_cause Catecholaminergic polymorphic ventricular tachycardia Ryanodine receptor 2 Sudden death Sudden cardiac death Internal medicine medicine Humans Calcium Signaling Phosphorylation Molecular Biology Mutation business.industry Ryanodine receptor Arrhythmias Cardiac Ryanodine Receptor Calcium Release Channel medicine.disease Cyclic AMP-Dependent Protein Kinases Electrophysiology Multiprotein Complexes Calcium-Calmodulin-Dependent Protein Kinases Ventricular fibrillation Tachycardia Ventricular cardiovascular system Cardiology medicine.symptom Calcium-Calmodulin-Dependent Protein Kinase Type 2 Cardiology and Cardiovascular Medicine business Neuroscience |
| Zdroj: | Journal of Molecular and Cellular Cardiology. 42:34-50 |
| ISSN: | 0022-2828 |
| DOI: | 10.1016/j.yjmcc.2006.08.115 |
| Popis: | It has been six years since the first reported link between mutations in the cardiac ryanodine receptor Ca(2+) release channel (RyR2) and catecholaminergic polymorphic ventricular tachycardia (CPVT), a malignant stress-induced arrhythmia. In this time, rapid advances have been made in identifying new mutations, and in understanding how these mutations disrupt normal channel function to cause VT that frequently degenerates into ventricular fibrillation (VF) and sudden death. Functional characterisation of these RyR2 Ca(2+) channelopathies suggests that mutations alter the ability of RyR2 to sense its intracellular environment, and that channel modulation via covalent modification, Ca(2+)- and Mg(2+)-dependent regulation and structural feedback mechanisms are catastrophically disturbed. This review reconciles the current status of RyR2 mutation-linked etiopathology, the significance of mutational clustering within the RyR2 polypeptide and the mechanisms underlying channel dysfunction. We will also review new data that explores the link between abnormal Ca(2+) release and the resultant cardiac electrical instability in VT and VF, and how these recent developments impact on novel anti-arrhythmic therapies. Finally, we evaluate the concept that mechanistic differences between CPVT and other arrhythmogenic disorders may preclude a common therapeutic strategy to normalise RyR2 function in cardiac disease. |
| Databáze: | OpenAIRE |
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