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EMBO Mol Med. 2015 Sep;7(9):1229-43. doi: 10.15252/emmm.201404669.

Cardiac LXRα protects against pathological cardiac hypertrophy and dysfunction by enhancing glucose uptake and utilization.

Author information

1
Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
2
Department of Nuclear Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
3
Department Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
4
Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
5
Department of Biochemistry & Molecular Biology, Mayo Clinic, Rochester, MN, USA.
6
Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands.
7
Department of Biology and Biochemistry, University of Houston, Houston, TX, USA Department of Biosciences and Nutrition, Novum, Karolinska Institutet, Huddinge, Sweden.
8
Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands r.a.de.boer@umcg.nl.

Abstract

Pathological cardiac hypertrophy is characterized by a shift in metabolic substrate utilization from fatty acids to glucose, but the molecular events underlying the metabolic remodeling remain poorly understood. Here, we investigated the role of liver X receptors (LXRs), which are key regulators of glucose and lipid metabolism, in cardiac hypertrophic pathogenesis. Using a transgenic approach in mice, we show that overexpression of LXRα acts to protect the heart against hypertrophy, fibrosis, and dysfunction. Gene expression profiling studies revealed that genes regulating metabolic pathways were differentially expressed in hearts with elevated LXRα. Functionally, LXRα overexpression in isolated cardiomyocytes and murine hearts markedly enhanced the capacity for myocardial glucose uptake following hypertrophic stress. Conversely, this adaptive response was diminished in LXRα-deficient mice. Transcriptional changes induced by LXRα overexpression promoted energy-independent utilization of glucose via the hexosamine biosynthesis pathway, resulting in O-GlcNAc modification of GATA4 and Mef2c and the induction of cytoprotective natriuretic peptide expression. Our results identify LXRα as a key cardiac transcriptional regulator that helps orchestrate an adaptive metabolic response to chronic cardiac stress, and suggest that modulating LXRα may provide a unique opportunity for intervening in myocyte metabolism.

KEYWORDS:

O‐GlcNAcylation; glucose metabolism; left ventricular hypertrophy; liver X receptor; nuclear receptor

PMID:
26160456
PMCID:
PMC4568954
DOI:
10.15252/emmm.201404669
[Indexed for MEDLINE]
Free PMC Article

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