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ERK1/2-Integrin Signaling in Desmosome-Dyad Crosstalk

桥粒-二元串扰中的 ERK1/2-整合素信号转导

基本信息

批准号：
10687055
负责人：
Long-Sheng Song
金额：
$ 62.06万
依托单位：
UNIVERSITY OF IOWA
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-09-01 至 2025-08-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10687055
关键词：
Action Potentials Address Affect American Arrhythmia Arrhythmogenic Right Ventricular Dysplasia CRISPR/Cas technology Cardiac Cardiac Myocytes Cardiovascular Diagnostic Techniques Catecholamines Cell Adhesion Cells Clinical Clinical Trials Collagen Communication Coupling Cyclic AMP-Dependent Protein Kinases Data Defect Deposition Desmosomes Disease Disease Progression Emotional Exercise Exhibits Fibronectins Functional disorder Gene Mutation Genes Goals Guidelines Heart Heart Diseases Heart Transplantation Heart failure Hereditary Disease Homeostasis Human Hyperactivity Impairment Induced Mutation Infiltration Infusion procedures Inherited Integrins Intercellular Junctions Intervention Isoproterenol Knock-in Knock-in Mouse Knockout Mice Knowledge Life Life Expectancy Link MAPK3 gene Mass Spectrum Analysis Measures Mechanical Stress Mechanics Mediating Modeling Molecular Mus Muscle Cells Mutation Myocardial dysfunction Myocardium Nature Outcome Pathogenicity Pathologic Pathology Pathway interactions Patients Phenotype Phosphorylation Predisposition Primary Myocardial Diseases Probability Process Proteins Quality of life Right Ventricular Dysfunction Role RyR2 Ryanodine Receptor Calcium Release Channel Sampling Sarcoplasmic Reticulum Signal Transduction Stress Sympathectomy Symptoms Tachycardia Techniques Testing Therapeutic Time Tissues Ubiquitin Ventricular Ventricular Arrhythmia Ventricular Tachycardia age related carvedilol congenic coronary fibrosis effective therapy improved insight knock-down mouse model mutant novel novel therapeutics prevent proteomic signature response sudden cardiac death transcriptomics

项目摘要

PROJECT SUMMARY Arrhythmogenic Right Ventricular Cardiomyopathy (ARVC) is an inherited disease characterized by fibro-fatty infiltration of the heart, life-threatening ventricular arrhythmias and sudden cardiac death, particularly in response to sympathetic stress. ARVC is a leading cause of sudden cardiac death among young athletes with no prior symptoms or diagnosis of cardiovascular disease. Desmosome cell-adhesion gene mutations constitute the majority of familial ARVC cases, but it remains largely unknown how catecholamine-sensitive ventricular tachycardia and cardiac remodeling processes are facilitated by desmosome dysfunction. Patient management is therefore limited to improving quality of life by reducing arrhythmic symptoms or cardiac transplantation upon advanced heart failure. To begin to uncover mechanisms inherent to ARVC, we performed unbiased mass spectrometry analysis of ventricular samples from patients with different desmosomal gene mutations. Our preliminary data demonstrate that integrin β1D is significantly downregulated in ARVC resulting in de- stabilization of RyR2 ryanodine receptor Ca2+ channels that localize to cardiac dyad junctions. Mechanistically, we find that ERK1/2 activation in response to desmosome loss results in ubiquitin-dependent degradation of integrin β1D, RyR2 Ser-2030 phosphorylation, sarcoplasmic reticulum Ca2+ leak and arrhythmogenesis. Importantly, hearts of our integrin β1D knockout mice exhibit ARVC-like disease with increased RyR2 phosphorylation, catecholamine-induced ventricular arrhythmias and cardiac fibrosis. We hypothesize that communication between desmosome junctions and cardiac dyads is essential for maintaining Ca2+ homeostasis and that ERK1/2 activation-induced loss of integrin β1D impairs this “desmosome-dyad crosstalk” thereby promoting RyR2-dependent and catecholamine-sensitive arrhythmogenesis and fibrotic infiltration in ARVC. We further hypothesize that interventions targeting this pathway may offer a promising approach for treating ARVC. To test our hypothesis, we have generated three congenic knock-in mouse models using CRISPR-Cas9 that contain mutations equivalent to those we identified from human ARVC patients. In Aim 1, we will determine the pathogenicity of knock-in ARVC mutations in recapitulating cardiac remodeling, catecholamine-induced arrhythmogenesis and desmosome-dyad crosstalk in mutant ARVC mice. In Aims 2 and 3, we will test whether mutation-induced ARVC phenotypes can be effectively prevented through ERK1/2 (Aim 2) and RyR2 (Aim 3) inhibition. We expect our studies to show that life-threatening ventricular arrhythmias and heart failure from ARVC can be therapeutically managed by modulating desmosome-dyad crosstalk and attenuating Ca2+ handling dysfunction.

项目总结