Constitutive Glycogen Synthase Kinase-3alpha/beta Activity Protects Against Chronic Beta-adrenergic Remodelling of the Heart

Overview

Journal Cardiovasc Res

Specialty Cardiology & Vascular Diseases

Date 2010 Mar 20

PMID 20299330

Citations 18

Authors

Ian G Webb

Yasuhiro Nishino

James E Clark

Colin Murdoch

Simon J Walker

Marcus R Makowski

Rene M Botnar

Simon R Redwood

Ajay M Shah

Michael S Marber

Affiliations

Soon will be listed here.

Abstract

Aims: Glycogen synthase kinase 3 (GSK-3) signalling is implicated in the growth of the heart during development and in response to stress. However, its precise role remains unclear. We set out to characterize developmental growth and response to chronic isoproterenol (ISO) stress in knockin (KI) mice lacking the critical N-terminal serines, 21 of GSK-3alpha and 9 of GSK-3beta respectively, required for inactivation by upstream kinases.

Methods And Results: Between 5 and 15 weeks, KI mice grew more rapidly, but normalized heart weight and contractile performance were similar to wild-type (WT) mice. Isolated hearts of both genotypes responded comparably to acute ISO infusion with increases in heart rate and contractility. In WT mice, chronic subcutaneous ISO infusion over 14 days resulted in cardiac hypertrophy, interstitial fibrosis, and impaired contractility, accompanied by foetal gene reactivation. These effects were all significantly attenuated in KI mice. Indeed, ISO-treated KI hearts demonstrated reversible physiological remodelling traits with increased stroke volume and a preserved contractile response to acute adrenergic stimulation. Furthermore, simultaneous pharmacological inhibition of GSK-3 in KI mice treated with chronic subcutaneous ISO recapitulated the adverse remodelling phenotype seen in WT hearts.

Conclusion: Expression of inactivation-resistant GSK-3alpha/beta does not affect eutrophic myocardial growth but protects against pathological hypertrophy induced by chronic adrenergic stimulation, maintaining cardiac function and attenuating interstitial fibrosis. Accordingly, strategies to prevent phosphorylation of Ser-21/9, and consequent inactivation of GSK-3alpha/beta, may enable a sustained cardiac response to chronic beta-agonist stimulation while preventing pathological remodelling.

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