Journal
JACC-BASIC TO TRANSLATIONAL SCIENCE
Volume 8, Issue 5, Pages 518-542Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jacbts.2022.11.003
Keywords
atrial natriuretic peptide; heart failure; palmitoylation; Rab3; exocytosis
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Production and release of natriuretic peptides by the stressed heart can reduce cardiac workload and be targeted for the treatment of heart failure. However, the mechanisms regulating cardiomyocyte exocytosis and natriuretic peptide release are still unclear. Our study reveals a novel pathway involving zDHHC9-mediated palmitoylation of Rab3gap1, which impairs exocytosis and limits atrial natriuretic peptide release.
Production and release of natriuretic peptides by the stressed heart reduce cardiac workload by promoting vasodilation, natriuresis, and diuresis, which has been leveraged in the recent development of novel heart -failure pharmacotherapies, yet the mechanisms regulating cardiomyocyte exocytosis and natriuretic peptide release remain ill defined. We found that the Golgi S-acyltransferase zDHHC9 palmitoylates Rab3gap1 resulting in its spatial segregation from Rab3a, elevation of Rab3a-GTP levels, formation of Rab3a-positive peripheral vesicles, and impairment of exocytosis that limits atrial natriuretic peptide release. This novel pathway potentially can be exploited for targeting natriuretic peptide signaling in the treatment of heart failure. (J Am Coll Cardiol Basic Trans Science 2023;8:518-542) (c) 2023 The Authors. Published by Elsevier on behalf of the American College of Cardiology Foundation. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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