Pyruvate dehydrogenase activation precedes the down-regulation of fatty acid oxidation in monocrotaline-induced myocardial toxicity in mice

Gaku Nakai, Daisuke Shimura, Ken Uesugi, Ichige Kajimura, Qibin Jiao, Yoichiro Kusakari, Tomoyoshi Soga, Nobuhito Goda, Susumu Minamisawa

    Research output: Contribution to journalArticle

    Abstract

    Fatty acid (FA) oxidation is impaired and glycolysis is promoted in the damaged heart. However, the factor(s) in the early stages of myocardial metabolic impairment remain(s) unclear. C57B6 mice were subcutaneously administered monocrotaline (MCT) in doses of 0.3 mg/g body weight twice a week for 3 or 6 weeks. Right and left ventricles at 3 and 6 weeks after administration were subjected to capillary electrophoresis–mass spectrometry metabolomic analysis. We also examined mRNA and protein levels of key metabolic molecules. Although no evidence of PH and right ventricular failure was found in the MCT-administered mice by echocardiographic and histological analyzes, the expression levels of stress markers such as TNFα and IL-6 were increased in right and left ventricles even at 3 weeks, suggesting that there was myocardial damage. Metabolites in the tricarboxylic acid (TCA) cycle were decreased and those in glycolysis were increased at 6 weeks. The expression levels of FA oxidation-related factors were decreased at 6 weeks. The phosphorylation level of pyruvate dehydrogenase (PDH) was significantly decreased at 3 weeks. FA oxidation and the TCA cycle were down-regulated, whereas glycolysis was partially up-regulated by MCT-induced myocardial damage. PDH activation preceded these alterations, suggesting that PDH activation is one of the earliest events to compensate for a subtle metabolic impairment from myocardial damage.

    Original languageEnglish
    JournalHeart and Vessels
    DOIs
    Publication statusAccepted/In press - 2018 Jan 1

    Fingerprint

    Monocrotaline
    Pyruvic Acid
    Heart Ventricles
    Oxidoreductases
    Glycolysis
    Fatty Acids
    Down-Regulation
    Citric Acid Cycle
    Metabolomics
    Interleukin-6
    Spectrum Analysis
    Body Weight
    Phosphorylation
    Messenger RNA
    Proteins

    Keywords

    • Cardiac metabolism
    • Glycolysis
    • Metabolomics
    • Monocrotaline
    • Pyruvate dehydrogenase

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine

    Cite this

    Pyruvate dehydrogenase activation precedes the down-regulation of fatty acid oxidation in monocrotaline-induced myocardial toxicity in mice. / Nakai, Gaku; Shimura, Daisuke; Uesugi, Ken; Kajimura, Ichige; Jiao, Qibin; Kusakari, Yoichiro; Soga, Tomoyoshi; Goda, Nobuhito; Minamisawa, Susumu.

    In: Heart and Vessels, 01.01.2018.

    Research output: Contribution to journalArticle

    Nakai, Gaku ; Shimura, Daisuke ; Uesugi, Ken ; Kajimura, Ichige ; Jiao, Qibin ; Kusakari, Yoichiro ; Soga, Tomoyoshi ; Goda, Nobuhito ; Minamisawa, Susumu. / Pyruvate dehydrogenase activation precedes the down-regulation of fatty acid oxidation in monocrotaline-induced myocardial toxicity in mice. In: Heart and Vessels. 2018.
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