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A mouse model reveals an important role for catecholamine-induced lipotoxicity in the pathogenesis of stress-induced cardiomyopathy.

Journal article
Authors Yangzhen Shao
Björn Redfors
Marcus Ståhlman
Margareta Scharin Täng
Azra Miljanovic
Helge Möllmann
Christian Troidl
Sebastian Szardien
Christian Hamm
Holger Nef
Jan Borén
Elmir Omerovic
Published in European journal of heart failure
Volume 15
Issue 1
Pages 9-22
ISSN 1879-0844
Publication year 2013
Published at Wallenberg Laboratory
Institute of Medicine, Department of Molecular and Clinical Medicine
Pages 9-22
Language en
Links dx.doi.org/10.1093/eurjhf/hfs161
Keywords Stress-induced cardiomyopathy,Takostubo cardiomyopathy, ApoB lipoprotein, Adrenergic stimulation
Subject categories Cardiovascular medicine

Abstract

AimStress-induced cardiomyopathy (SIC), also known as takotsubo cardiomyopathy, is an acute cardiac syndrome with substantial morbidity and mortality. The unique hallmark of SIC is extensive ventricular dysfunction (akinesia) involving apical segments with preserved function in basal segments. Adrenergic overstimulation plays an important role in initiating SIC, but the pathomechanisms involved are unknown. We tested the hypothesis that excessive catecholamines cause perturbation of myocardial lipid metabolism and that cardiac lipotoxicity is responsible for the pathogenesis of SIC. METHODS AND RESULTS: A single dose injection of isoprenaline (ISO; 400 mg/kg) induced SIC-like regional akinesia in mice. Oil red O staining revealed severe lipid accumulation in the heart 2 h post-ISO. Both intramyocardial lipid accumulation and cardiac function were normalized within 1 week post-ISO and no significant amount of fibrosis was detected. We found that gene expression of lipid importers and exporters (ApoB lipoprotein) was depressed 2 h post-ISO. These results were confirmed by similar findings in SIC patients and in ISO/patient serum-stressed HL-1 cardiomyocytes. Moreover, overexpression of ApoB in the heart was found to protect against the development of ISO-induced cardiac toxicity and cardiac dysfunction. We also found that ISO-induced intramyocardial lipid accumulation caused electrophysiological disturbance and stunning in ISO/patient serum-stressed HL-1 cardiomyocytes. CONCLUSIONS: The present study demonstrates that lipotoxicity is closely associated with catecholamine-induced myocardial dysfunction, including neurogenic stunning, metabolic stunning, and electrophysiological stunning. Cardiac lipotoxicity may originate from direct inhibition of myocardial ApoB lipoprotein and subsequent decreased lipid export, caused by supraphysiological levels of catecholamines.

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