Induction of the calcineurin variant CnAβ1 after myocardial infarction reduces post-infarction ventricular remodelling by promoting infarct vascularization.

Abstract:

AIMS:Ventricular remodelling following myocardial infarction progressively leads to loss of contractile capacity and heart failure. Although calcineurin promotes maladaptive cardiac hypertrophy, we recently showed that the calcineurin splicing variant, CnAβ1, has beneficial effects on the infarcted heart. However, whether this variant limits necrosis or improves remodelling is still unknown, precluding translation to the clinical arena. Here, we explored the effects and therapeutic potential of CnAβ1 overexpression post-infarction. METHODS AND RESULTS:Double transgenic mice with inducible cardiomyocyte-specific overexpression of CnAβ1 underwent left coronary artery ligation followed by reperfusion. Echocardiographic analysis showed depressed cardiac function in all infarcted mice 3 days post-infarction. Induction of CnAβ1 overexpression 1 week after infarction improved function and reduced ventricular dilatation. CnAβ1-overexpressing mice showed shorter, thicker scars, and reduced infarct expansion, accompanied by reduced myocardial remodelling. CnAβ1 induced vascular endothelial growth factor (VEGF) expression in cardiomyocytes, which resulted in increased infarct vascularization. This paracrine angiogenic effect of CnAβ1 was mediated by activation of the Akt/mammalian target of rapamycin pathway and VEGF. CONCLUSIONS:Our results indicate that CnAβ1 exerts beneficial effects on the infarcted heart by promoting infarct vascularization and preventing infarct expansion. These findings emphasize the translational potential of CnAβ1 for gene-based therapies.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

López-Olañeta MM,Villalba M,Gómez-Salinero JM,Jiménez-Borreguero LJ,Breckenridge R,Ortiz-Sánchez P,García-Pavía P,Ibáñez B,Lara-Pezzi E

doi

10.1093/cvr/cvu068

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

396-406

issue

3

eissn

0008-6363

issn

1755-3245

pii

cvu068

journal_volume

102

pub_type

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