Open Access
Modulation of cardiac ryanodine receptor activity by ROS and RNS
Paulina Donoso1,Gina Sanchez1,Ricardo Bull1,Cecilia Hidalgo1
Facultad de Medicina, Instituto de Ciencias Biomedicas and Centro de Estudios Moleculares de la Celula, Universidad de Chile, 838-0453 Santiago, Chile.
DOI: 10.2741/3705 Volume 16 Issue 2, pp.553-567
Published: 01 January 2011
(This article belongs to the Special Issue Calcium and the heart: signaling and regulation)

Calcium release through cardiac ryanodine receptors (RyR2) triggers heart muscle contraction. Reactive oxygen/nitrogen species (ROS/RNS), normally produced in the heart, promote endogenous RyR2 S-nitrosylation and S-glutathionylation. These reversible redox modifications increase RyR2 activity in vitro, and presumably also in vivo. RyR2 S-glutathionylation increases under physiologically relevant conditions (tachycardia and exercise), suggesting that cardiac cells utilize this redox modification to increase RyR2 activity under increased demand. In contrast, in vivo changes in RyR2 S-nitrosylation in response to physiological stimuli remain uncharacterized. The number and identity of the highly reactive RyR2 cysteine residues and the nature of the redox modification they undergo are presently unknown. Likewise, the physiological sources of ROS/RNS responsible for functionally relevant RyR2 redox modifications have not been completely identified. The redox state of RyR2 is altered in heart failure leading to enhanced RyR2 activity, which presumably contributes to decrease SR calcium content and induce other calcium release abnormalities observed in heart failure. Greater understanding of RyR2 redox modulation is necessary to counteract the deleterious consequences of RyR2 activity deregulation caused by oxidative stress.

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Paulina Donoso, Gina Sanchez, Ricardo Bull, Cecilia Hidalgo. Modulation of cardiac ryanodine receptor activity by ROS and RNS. Frontiers in Bioscience-Landmark. 2011. 16(2); 553-567.