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Regulation of myocardial GPCRs by USP20 in normal and hypertrophied heart

USP20 对正常和肥厚心脏中心肌 GPCR 的调节

基本信息

批准号：
10317884
负责人：
SUDHA K SHENOY
金额：
$ 56.21万
依托单位：
DUKE UNIVERSITY
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：
2021-07-01 至 2025-06-30
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10317884
关键词：
Address Adrenergic Receptor Affect Affinity Agonist American Apoptosis Autophagocytosis Autophagosome Biomechanics Blood Pressure C57BL/6 Mouse Cardiac Cardiac Myocytes Cardiac development Cardiomegaly Cellular Stress Chronic Clustered Regularly Interspaced Short Palindromic Repeats Complex Control Groups Coupling Cyclic AMP-Dependent Protein Kinases Deubiquitination Down-Regulation Drug Screening Fibrosis Functional disorder G-Protein-Coupled Receptors GTP-Binding Proteins Genes Heart Heart Hypertrophy Heart failure Human Hypertension Hypertrophy Isoproterenol Knock-in Mouse Knockout Mice Label Lead Left Ventricular Hypertrophy Left Ventricular Remodeling Ligands Link Lysine Mass Spectrum Analysis Mediating Mus Myocardial Myocardial dysfunction Myocardium Pathologic Pathway interactions Patients Phosphorylation Play Polyubiquitination Proteins Receptor Activation Regulation Research Role Signal Transduction Signaling Protein Testing Transducers Ubiquitination beta-2 Adrenergic Receptors cardioprotection constriction desensitization drug discovery experimental study heart function in vivo mortality novel pressure prevent protein expression receptor receptor expression response trafficking ubiquitin-specific protease

项目摘要

PROJECT SUMMARY Chronic pressure overload that leads to left ventricular hypertrophy (LVH) and adverse cardiac remodeling is one of the leading causes of heart failure and affects millions of Americans. In addition to pathological insults and biomechanical factors, neurohormonal pathways that involve coordinated signaling through β1 and β2 adrenergic receptors (ARs) can play a major role in myocardial adaptation to pressure overload. The factors that shift the myocardial response to pressure overload from adaptive to maladaptive LVH remain largely obscure. Our research has focused on the regulation of βAR trafficking and signaling by ubiquitination/deubiquitination mechanisms. We recently discovered that differential regulation of β1AR and β2AR endocytic trafficking can be achieved by the deubiquitinase (DUB) called ubiquitin-specific protease-20 (USP20), which we found deubiquitinates both βARs. In response to the βAR agonist (-)isoproterenol (Iso), USP20 is phosphorylated on Ser333 by protein kinase A (PKA); this phosphorylation inhibits USP20 DUB activity toward the β2AR and regulates trafficking of the β2AR to autophagosomes. USP20 phosphorylation occurs in vivo, as well: (1) USP20 phosphorylation is significantly elevated in failing human hearts when compared with non-failing hearts and (2) pressure overload achieved by transverse aortic constriction (TAC) triggers USP20 phosphorylation in cardiomyocytes of WT, but not β1AR KO mice. Accordingly, during LVH, USP20 phosphorylation requires β1AR activation in the heart and may play a role in pathologic remodeling in LVH and/or heart failure. We hypothesize that “USP20 and its phosphorylation status fine-tune βAR signal transduction, endocytic trafficking and autophagy, thus impacting cardiac remodeling in LVH.” We will test our hypotheses by addressing the following specific aims: (1) To determine the role of cardiomyocyte-USP20 in the development of cardiac dysfunction, (2) To determine the regulation of myocardial βAR signaling by USP20 Ser333 phosphorylation and (3) To determine the coordinated roles of β1AR and USP20 in regulating ubiquitination status of the autophagy protein Beclin1 and its effect in cardiomyocyte autophagy.

项目总结