Ryanodine receptors and ventricular arrhythmias: emerging trends in mutations, mechanisms and therapies.
J Mol Cell Cardiol
; 42(1): 34-50, 2007 Jan.
Article
en En
| MEDLINE
| ID: mdl-17081562
ABSTRACT
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.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Arritmias Cardíacas
/
Canal Liberador de Calcio Receptor de Rianodina
/
Mutación
Límite:
Humans
Idioma:
En
Revista:
J Mol Cell Cardiol
Año:
2007
Tipo del documento:
Article
País de afiliación:
Reino Unido