(Circulation. 2001;103:2387.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
Induced for Impaired Myocardial Energy Metabolism
From the Cardiovascular Division (Y.K., T.M., K.Y., N.M., I.Y.), Department of Internal Medicine, Institute of Clinical Medicine, and Department of Pharmacology (K.G.), Institute of Basic Medical Sciences, University of Tsukuba, Ibaraki, Japan.
Correspondence to Takashi Miyauchi, MD, PhD, Cardiovascular Division, Department of Internal Medicine, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan. E-mail t-miyauc{at}md.tsukuba.ac.jp
BackgroundHypoxia-inducible
factor (HIF)-1
is an important transcriptional factor that
activates the gene expression of glycolytic enzymes, which are
activated as compensation for impaired ß-oxidation of fatty
acid in the failing heart. We reported that cardiac endothelin (ET)-1
expression is markedly increased in heart failure. The mechanism,
however, is unknown. Because we found an HIF-1
binding site in the
5'-promoter region of the ET-1 gene, we hypothesized that HIF-1
is
involved in this mechanism.
Methods and ResultsIn
rat cardiomyocytes, luciferase assay and electrophoretic
mobility shift assay showed that HIF-1
transcriptionally
activates ET-1 gene expression by direct interaction with the
predicted DNA binding site in the 5'-promoter region. HIF-1
mRNA and
ET-1 mRNA in the failing heart increased during the aggravation of
heart failure in vivo in animal models, ie, rats with myocardial
infarction and hamsters with cardiomyopathy. In
cultured cardiomyocytes treated with a mitochondrial
inhibitor, HIF-1
mRNA and ET-1 mRNA were markedly
increased with activated glycolysis, and antisense
oligonucleotide for HIF-1
largely inhibited the
increased gene expression of ET-1.
ConclusionsThe
present study revealed a novel molecular mechanism of upregulation
of myocardial ET-1 in heart failure, indicating that induction of
HIF-1
to stimulate glycolysis as an adaptation in heart failure
against impaired energy metabolism alternatively causes an
elevation of cardiac ET-1 gene expression as a
maladaptation.
Key Words: endothelin heart failure metabolism genes
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