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- W200601437 abstract "We investigated whether the type of energy metabolism directly affects cardiac gene expression. During development, the heart switches from glycolysis to fatty acid beta-oxidation in vivo, as demonstrated by the developmental switching of the major isoform of myosin heavy chain (MHC) from beta to alpha. However, the beta-MHC isoform predominates in monocrotaline-induced pulmonary hypertension, a model of right ventricular hypertrophy in vivo. Cultured cardiomyocytes showed a predominance of beta-MHC expression over that of alpha-MHC, the same pattern as in the hypertrophied heart, suggesting that the in vitro condition itself causes the energy metabolism of cardiomyocytes to be switched to glycolysis. Electrical stimulation of cultured cardiomyocytes decreased the expression of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and hypoxia-inducible factor-1 alpha (HIF-1 alpha), but not that of peroxisome-proliferator-activated receptor-gamma co-activator, suggesting that electrical stimulation suppresses the glycolytic system. Furthermore, a higher oxygen content (50%) decreased drastically the expression of GAPDH, HIF-1 alpha and endothelin-1 (ET-1), and increased [(3)H]palmitate uptake. These findings indicate that the intrinsic energy metabolic system in cultured cardiomyocytes in vitro is predominantly glycolysis, and that the gene expression of cardiac ET-1 parallels the state of the glycolytic system. An antisense oligonucleotide against HIF-1 alpha greatly decreased the gene expression of ET-1 and GAPDH, suggesting that cardiac ET-1 gene expression is regulated by cardiac energy metabolism through HIF-1 alpha. In conclusion, it is suggested that the pattern of gene expression of ET-1 reflects the level of the glycolytic system in cardiomyocytes, and that enhanced glycolysis regulates the cardiac gene expression of ET-1 via HIF-1 alpha." @default.
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- W200601437 date "2002-09-01" @default.
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- W200601437 title "Enhancement of glycolysis in cardiomyocytes elevates endothelin-1 expression through the transcriptional factor hypoxia-inducible factor-1 α" @default.
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- W200601437 doi "https://doi.org/10.1042/cs103s210s" @default.
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