A-Kinase Anchoring Protein Lbc Coordinates a p38 Activating Signaling Complex Controlling Compensatory Cardiac Hypertrophy.

Details

Serval ID
serval:BIB_9FD003125CBF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A-Kinase Anchoring Protein Lbc Coordinates a p38 Activating Signaling Complex Controlling Compensatory Cardiac Hypertrophy.
Journal
Molecular and Cellular Biology
Author(s)
Pérez López I., Cariolato L., Maric D., Gillet L., Abriel H., Diviani D.
ISSN
1098-5549 (Electronic)
ISSN-L
0270-7306
Publication state
Published
Issued date
2013
Peer-reviewed
Oui
Volume
33
Number
15
Pages
2903-2917
Language
english
Notes
Publication types: Journal Article Publication Status: ppublish
Abstract
In response to stress, the heart undergoes a remodeling process associated with cardiac hypertrophy that eventually leads to heart failure. A-kinase anchoring proteins (AKAPs) have been shown to coordinate numerous prohypertrophic signaling pathways in cultured cardiomyocytes. However, it remains to be established whether AKAP-based signaling complexes control cardiac hypertrophy and remodeling in vivo. In the current study, we show that AKAP-Lbc assembles a signaling complex composed of the kinases PKN, MLTK, MKK3, and p38α that mediates the activation of p38 in cardiomyocytes in response to stress signals. To address the role of this complex in cardiac remodeling, we generated transgenic mice displaying cardiomyocyte-specific overexpression of a molecular inhibitor of the interaction between AKAP-Lbc and the p38-activating module. Our results indicate that disruption of the AKAP-Lbc/p38 signaling complex inhibits compensatory cardiomyocyte hypertrophy in response to aortic banding-induced pressure overload and promotes early cardiac dysfunction associated with increased myocardial apoptosis, stress gene activation, and ventricular dilation. Attenuation of hypertrophy results from a reduced protein synthesis capacity, as indicated by decreased phosphorylation of 4E-binding protein 1 and ribosomal protein S6. These results indicate that AKAP-Lbc enhances p38-mediated hypertrophic signaling in the heart in response to abrupt increases in the afterload.
Pubmed
Web of science
Open Access
Yes
Create date
11/08/2013 8:25
Last modification date
20/10/2020 10:08
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