GRK5 Controls SAP97-Dependent Cardiotoxic β1Adrenergic Receptor-CaMKII Signaling in Heart Failure
- 7 June 2020
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Circulation Research
- Vol. 127 (6), 796-810
- https://doi.org/10.1161/CIRCRESAHA.119.316319
Abstract
Rationale: Cardiotoxic beta(1)adrenergic receptor (beta(1)AR)-CaMKII (calmodulin-dependent kinase II) signaling is a major and critical feature associated with development of heart failure. SAP97 (synapse-associated protein 97) is a multifunctional scaffold protein that binds directly to the C-terminus of beta(1)AR and organizes a receptor signalosome. Objective: We aim to elucidate the dynamics of beta(1)AR-SAP97 signalosome and its potential role in chronic cardiotoxic beta(1)AR-CaMKII signaling that contributes to development of heart failure. Methods and Results: The integrity of cardiac beta(1)AR-SAP97 complex was examined in heart failure. Cardiac-specific deletion of SAP97 was developed to examine beta(1)AR signaling in aging mice, after chronic adrenergic stimulation, and in pressure overload hypertrophic heart failure. We show that the beta(1)AR-SAP97 signaling complex is reduced in heart failure. Cardiac-specific deletion of SAP97 yields an aging-dependent cardiomyopathy and exacerbates cardiac dysfunction induced by chronic adrenergic stimulation and pressure overload, which are associated with elevated CaMKII activity. Loss of SAP97 promotes PKA (protein kinase A)-dependent association of beta(1)AR with arrestin2 and CaMKII and turns on an Epac (exchange protein directly activated by cAMP)-dependent activation of CaMKII, which drives detrimental functional and structural remodeling in myocardium. Moreover, we have identified that GRK5 (G-protein receptor kinase-5) is necessary to promote agonist-induced dissociation of SAP97 from beta(1)AR. Cardiac deletion of GRK5 prevents adrenergic-induced dissociation of beta(1)AR-SAP97 complex and increases in CaMKII activity in hearts. Conclusions: These data reveal a critical role of SAP97 in maintaining the integrity of cardiac beta(1)AR signaling and a detrimental cardiac GRK5-CaMKII axis that can be potentially targeted in heart failure therapy.Funding Information
- HHS | NIH | National Heart, Lung, and Blood Institute (HL127764)
- HHS | NIH | National Heart, Lung, and Blood Institute (HL147263)
- HHS | NIH | National Heart, Lung, and Blood Institute (HL131517)
- VA Merit (01BX002900)
- American Heart Association (15SDG24910015)
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