Heart failure and arrhythmias are among the most significant causes of premature death in the United States. Activation of renin-angiotensin (Angll)-aldosterone (Aldo) signaling (RAAS) is a common feature of structural heart disease that leads to heart failure and is associated with arrhythmias. Drugs that inhibit RAAS are cornerstones for reducing death in heart failure patients, but the specific 'downstream'cellular signals that are activated by RAAS and represent the proximate cause of adverse structural and pro- arrhythmic electrical remodeling in heart failure are incompletely understood. RAAS causes increased oxidant stress and may increase cellular Ca2+. Our group has found that RAAS causes increased activity of the multifunctional Ca2+/calmodulin-dependent protein kinase II (CaMKII) and that CaMKII inhibition prevents or significantly reduces cardiac hypertrophy during RAAS. CaMKII has recently emerged as a pathological signal in heart failure and arrhythmias, and these findings mark CaMKII as a previously unrecognized but necessary signal for pathological RAAS. We have developed evidence that RAAS can activate CaMKII by cellular Ca2+ mobilization (a conventional mechanism) and by a novel, previously unidentified mechanism involving oxidant modification of susceptible amino acid residues in the CaMKII regulatory domain. NADPH oxidase is an enzyme complex that generates reactive oxygen species (ROS) during RAAS, and our preliminary findings suggest that NADPH oxidase is required for maximal CaMKII activity during RAAS. We will answer key questions posed in response to these preliminary findings using the following Specific Aims: 1. Determine the mechanism for CaMKII activation by Angll 2. Determine the role of Angll signaling through NF-kB and MEF2 3. Determine the role of CaMKII in Aldo signaling. The proposed studies will provide critically needed new knowledge of the mechanistic links between RAAS and important clinical phenotypes of cardiac hypertrophy, dysfunction and arrhythmias.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL079031-04
Application #
7665416
Study Section
Special Emphasis Panel (ZRG1-CVS-A (02))
Program Officer
Lathrop, David A
Project Start
2006-08-23
Project End
2010-07-31
Budget Start
2009-08-01
Budget End
2010-07-31
Support Year
4
Fiscal Year
2009
Total Cost
$358,056
Indirect Cost
Name
University of Iowa
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
062761671
City
Iowa City
State
IA
Country
United States
Zip Code
52242
Yan, Jiajie; Zhao, Weiwei; Thomson, Justin K et al. (2018) Stress Signaling JNK2 Crosstalk With CaMKII Underlies Enhanced Atrial Arrhythmogenesis. Circ Res 122:821-835
Qu, Jingjing; Do, Danh C; Zhou, Yufeng et al. (2017) Oxidized CaMKII promotes asthma through the activation of mast cells. JCI Insight 2:e90139
Anderson, Mark E; Ray, Stuart C (2017) It's 10 pm; Do You Know Where Your Data Are? Data Provenance, Curation, and Storage. Circ Res 120:1551-1554
Feng, Ning; Anderson, Mark E (2017) CaMKII is a nodal signal for multiple programmed cell death pathways in heart. J Mol Cell Cardiol 103:102-109
Habecker, Beth A; Anderson, Mark E; Birren, Susan J et al. (2016) Molecular and cellular neurocardiology: development, and cellular and molecular adaptations to heart disease. J Physiol 594:3853-75
Mesubi, Olurotimi O; Anderson, Mark E (2016) Atrial remodelling in atrial fibrillation: CaMKII as a nodal proarrhythmic signal. Cardiovasc Res 109:542-57
Manotheepan, Ravinea; Danielsen, Tore K; Sadredini, Mani et al. (2016) Exercise training prevents ventricular tachycardia in CPVT1 due to reduced CaMKII-dependent arrhythmogenic Ca2+ release. Cardiovasc Res 111:295-306
Gao, Zhan; Sierra, Ana; Zhu, Zhiyong et al. (2016) Loss of ATP-Sensitive Potassium Channel Surface Expression in Heart Failure Underlies Dysregulation of Action Potential Duration and Myocardial Vulnerability to Injury. PLoS One 11:e0151337
Unudurthi, Sathya D; Wu, Xiangqiong; Qian, Lan et al. (2016) Two-Pore K+ Channel TREK-1 Regulates Sinoatrial Node Membrane Excitability. J Am Heart Assoc 5:e002865
Wu, Yuejin; Valdivia, H├ęctor H; Wehrens, Xander H T et al. (2016) A Single Protein Kinase A or Calmodulin Kinase II Site Does Not Control the Cardiac Pacemaker Ca2+ Clock. Circ Arrhythm Electrophysiol 9:e003180

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