Deficiency of PDK1 in cardiac muscle results in heart failure and increased sensitivity to hypoxia

Alfonso Mora, Anthony M. Davies, Luc Bertrand, Isam Sharif, Grant R. Budas, Sofija Jovanovic, Veronique Mouton, C. Ronald Kahn, John M. Lucocq, Gillian A. Gray, Aleksandar Jovanovic, Dario R. Alessi

    Research output: Contribution to journalArticlepeer-review

    147 Citations (Scopus)

    Abstract

    We employed Cre/loxP technology to generate mPDK1-/- mice, which lack PDK1 in cardiac muscle. Insulin did not activate PKB and S6K, nor did it stimulate 6-phosphofructo-2-kinase and production of fructose 2,6-bisphosphate, in the hearts of mPDK1-/- mice, consistent with PDK1 mediating these processes. All mPDK1-/- mice died suddenly between 5 and 11 weeks of age. The mPDK1-/- animals had thinner ventricular walls, enlarged atria and right ventricles. Moreover, mPDK1-/- muscle mass was markedly reduced due to a reduction in cardiomyocyte volume rather than cardiomyocyte cell number, and markers of heart failure were elevated. These results suggested mPDK1-/- mice died of heart failure, a conclusion supported by echocardiographic analysis. By employing a single-cell assay we found that cardiomyocytes from mPDK1-/- mice are markedly more sensitive to hypoxia. These results establish that the PDK1 signalling network plays an important role in regulating cardiac viability and preventing heart failure. They also suggest that a deficiency of the PDK1 pathway might contribute to development of cardiac disease in humans.
    Original languageEnglish
    Pages (from-to)4666-4676
    Number of pages11
    JournalThe EMBO Journal
    Volume22
    Issue number18
    DOIs
    Publication statusPublished - Sep 2003

    Keywords

    • Cardiac muscle
    • Heart failure
    • Hypoxia
    • PDK1
    • PI 3-kinase
    • PKB
    • Akt
    • Protein kinase B (PKB)

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