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  • 1.
    Chaudhari, Aditi
    et al.
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Krumlinde, Daniel
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Lundqvist, Annika
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Akyürek, Levent M.
    Department of Medical Chemistry and Cell biology, University of Gothenburg, Sweden.
    Bandaru, Sashidhar
    Department of Medical Chemistry and Cell biology, University of Gothenburg, Sweden.
    Skålén, Kristina
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Ståhlman, Marcus
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Borén, Jan
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, University of Gothenburg, Sweden.
    Wettergren, Yvonne
    Department of Surgery, University of Gothenburg, Sweden.
    Ejeskär, Katarina
    University of Skövde, School of Bioscience. University of Skövde, The Systems Biology Research Centre. Department of Medical and Clinical Genetics, University of Gothenburg, Sweden.
    Rotter Sopasakis, Victoria
    Wallenberg Laboratory, Department of Molecular and Clinical Medicine, Sahlgrenska Academy, University of Gothenburg, Sweden.
    p110α hot spot mutations E545K and H1047R exert metabolic reprogramming independently of p110α kinase activity2015In: Molecular and Cellular Biology, ISSN 0270-7306, E-ISSN 1098-5549, Vol. 35, no 19, p. 3258-3273Article in journal (Refereed)
    Abstract [en]

    The phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) catalytic subunit p110α is the most frequently mutated kinase in human cancer, and the hot spot mutations E542K, E545K, and H1047R are the most common mutations in p110α. Very little is known about the metabolic consequences of the hot spot mutations of p110α in vivo. In this study, we used adenoviral gene transfer in mice to investigate the effects of the E545K and H1047R mutations on hepatic and whole-body glucose metabolism. We show that hepatic expression of these hot spot mutations results in rapid hepatic steatosis, paradoxically accompanied by increased glucose tolerance, and marked glycogen accumulation. In contrast, wild-type p110α expression does not lead to hepatic accumulation of lipids or glycogen despite similar degrees of upregulated glycolysis and expression of lipogenic genes. The reprogrammed metabolism of the E545K and H1047R p110α mutants was surprisingly not dependent on altered p110α lipid kinase activity.

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