These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Microdomain switch of cGMP-regulated phosphodiesterases leads to ANP-induced augmentation of β-adrenoceptor-stimulated contractility in early cardiac hypertrophy.
    Author: Perera RK, Sprenger JU, Steinbrecher JH, Hübscher D, Lehnart SE, Abesser M, Schuh K, El-Armouche A, Nikolaev VO.
    Journal: Circ Res; 2015 Apr 10; 116(8):1304-11. PubMed ID: 25688144.
    Abstract:
    RATIONALE: Cyclic nucleotides are second messengers that regulate cardiomyocyte function through compartmentalized signaling in discrete subcellular microdomains. However, the role of different microdomains and their changes in cardiac disease are not well understood. OBJECTIVE: To directly visualize alterations in β-adrenergic receptor-associated cAMP and cGMP microdomain signaling in early cardiac disease. METHODS AND RESULTS: Unexpectedly, measurements of cell shortening revealed augmented β-adrenergic receptor-stimulated cardiomyocyte contractility by atrial natriuretic peptide/cGMP signaling in early cardiac hypertrophy after transverse aortic constriction, which was in sharp contrast to well-documented β-adrenergic and natriuretic peptide signaling desensitization during chronic disease. Real-time cAMP analysis in β1- and β2-adrenergic receptor-associated membrane microdomains using a novel membrane-targeted Förster resonance energy transfer-based biosensor transgenically expressed in mice revealed that this unexpected atrial natriuretic peptide effect is brought about by spatial redistribution of cGMP-sensitive phosphodiesterases 2 and 3 between both receptor compartments. Functionally, this led to a significant shift in cGMP/cAMP cross-talk and, in particular, to cGMP-driven augmentation of contractility in vitro and in vivo. CONCLUSIONS: Redistribution of cGMP-regulated phosphodiesterases and functional reorganization of receptor-associated microdomains occurs in early cardiac hypertrophy, affects cGMP-mediated contractility, and might represent a previously not recognized therapeutically relevant compensatory mechanism to sustain normal heart function.
    [Abstract] [Full Text] [Related] [New Search]