Calcium regulation in cardiac myocytes is central to excitation-contraction coupling (ECC) and in mitochondrial and hypertrophic (Hyp) nuclear signaling. Ubiquitous Ca regulatory systems, Ca-calmodulin (CaM) dependent protein kinase II (CaMKll), calcineurin and inositol (1,4,5)P3 receptors (InsP3R) in myocytes have been implicated in altering ECC, arrhythmogenesis and nuclear signaling. This PPG has advanced understanding of these emergent fields during the current award. In this renewal, novel questions &methods will be used to deepen understanding of these areas with respect to ECC, mitochondrial signaling, Hyp &heart failure (HF). Four highly synergistic multidisciplinary projects are planned. Project I (Bers) focuses on critical aspects of cellular CaMKll in aims concerning: 1) acute CaM &CaMKll effects on ECC, 2) Ca/CaM-dependent nuclear signaling via HDAC and NFAT, 3) quantitative aspects of mitochondrial Ca signaling, and 4) altered CaMKll signaling in Hyp &HF (regarding ECC, arrhythmias &nuclear regulation). Project II (Blatter) focuses on cellular aspects of IP3 signaling in 3 aims (?Hyp &HF) concerning: 1) acute IP3R-mediated effects on ECC and arrhythmias, 2) the role of InsP3R in mitochondrial Ca signaling and oxidative stress, and 3) Ca coding and IP3R involvement in nuclear NFAT signaling. Project III (Molkentin) focuses on Ca signaling and hypertrophic signaling and will assess how 1) altered Na influx via Na channels and 2) altered Na efflux via Na/K-ATPase regulate myocyte Ca and Hyp, and 3) how cyclophilin D &permeability transition pore regulate mitochondrial Ca. Project IV (Brown) focuses on CaMKll isoform-specific targets and localization by assessing 1) CaMKIldeltaB(B vs. CaMKIldeltaC(c localization and targets, 2) functional consequences of CaMKll compartmentalization, 3) how CaMKll is involved in post-ischemic signaling and 4) how CaMKll alters mitochondrial function. Scientific cores will support these aims. Core B (Genefic Mouse Models) will develop unique mice (e.g. KO/transgenics for InsP3R, CaMKIIdelta/gamma(, PKD, Epac1/2) for whole animal &myocyte studies. Core C (HF Rabbits) will prepare and do some analysis of HF rabbits. This integrates experienced investigators with highly complementary expertise and perspective to tackle these questions in an interactive multidisciplinary approach. Results will greatly increase our understanding of the roles of CaMKll and InsP3R in cardiac myocytes during ECC, arrhythmogenesis &nuclear signaling in normal, Hyp and HF cardiac myocytes.
Cardiac myocyte calcium signaling is critical to the electrical activity which synchronizes the heartbeat, the contraction that pumps blood, energetic balance at the mitochondrial level, and the control of gene transcription. In heart failure or arrhythmias things go wrong in these pathways, contributing to heart malfunction. Here we will provide novel experimental results in careful quantitative studies, which will help to understand the fundamental workings of these systems critical to health and cardiac disease.
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|Burel, Sophie; Coyan, Fabien C; Lorenzini, Maxime et al. (2017) C-terminal phosphorylation of NaV1.5 impairs FGF13-dependent regulation of channel inactivation. J Biol Chem 292:17431-17448|
|Kanaporis, Giedrius; Blatter, Lothar A (2017) Membrane potential determines calcium alternans through modulation of SR Ca2+ load and L-type Ca2+ current. J Mol Cell Cardiol 105:49-58|
|Bovo, Elisa; Huke, Sabine; Blatter, Lothar A et al. (2017) The effect of PKA-mediated phosphorylation of ryanodine receptor on SR Ca2+ leak in ventricular myocytes. J Mol Cell Cardiol 104:9-16|
|Bers, Donald M (2017) CALMing Down Arrhythmogenic Calmodulinopathies via a Precision Medicine Approach. Circ Res 120:3-4|
|Lang, Di; Sato, Daisuke; Jiang, Yanyan et al. (2017) Calcium-Dependent Arrhythmogenic Foci Created by Weakly Coupled Myocytes in the Failing Heart. Circ Res 121:1379-1391|
|Ma, Xiaolong; Chen, Chao; Veevers, Jennifer et al. (2017) CRISPR/Cas9-mediated gene manipulation to create single-amino-acid-substituted and floxed mice with a cloning-free method. Sci Rep 7:42244|
|Dewenter, Matthias; Neef, Stefan; Vettel, Christiane et al. (2017) Calcium/Calmodulin-Dependent Protein Kinase II Activity Persists During Chronic ?-Adrenoceptor Blockade in Experimental and Human Heart Failure. Circ Heart Fail 10:e003840|
|Pereira, Laëtitia; Bare, Dan J; Galice, Samuel et al. (2017) ?-Adrenergic induced SR Ca2+ leak is mediated by an Epac-NOS pathway. J Mol Cell Cardiol 108:8-16|
|Blatter, Lothar A (2017) The intricacies of atrial calcium cycling during excitation-contraction coupling. J Gen Physiol 149:857-865|
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