Prevention of high-fat diet-induced muscular lipid accumulation in rats by alpha lipoic acid is not mediated by AMPK activation

Silvie Timmers, Johan de Vogel-van den Bosch, Mhairi C. Towler, Gert Schaart, Esther Moonen-Kornips, Ronald P. Mensink, Matthijs K. Hesselink, D. Grahame Hardie, Patrick Schrauwen

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    Abstract

    Skeletal muscle triglyceride accumulation is associated with insulin resistance in obesity. Recently, it has been suggested that alpha lipoic acid (ALA) improves insulin sensitivity by lowering triglyceride accumulation in nonadipose tissues via activation of skeletal muscle AMP-activated protein kinase (AMPK). We examined whether chronic ALA supplementation prevents muscular lipid accumulation that is associated with high-fat diets via activation of AMPK. In addition, we tested if ALA supplementation was able to improve insulin sensitivity in rats fed low-and high-fat diets (LFD, HFD). Supplementing male Wistar rats with 0.5% ALA for 8 weeks significantly reduced body weight, both on LFD and HFD (-24% LFD+ALA vs. LFD, P < 0.01, and - 29% HFD+ALA vs. HFD, P < 0.001). Oil red O lipid staining revealed a 3-fold higher lipid content in skeletal muscle after HFD compared with LFD and ALA-supplemented groups (P < 0.05). ALA improved whole body glucose tolerance (similar to 20% lower total area under the curve (AUC) in ALA supplemented groups vs. controls, P < 0.05). These effects were not mediated by increased muscular AMPK activation or ALA-induced improvement of muscular insulin sensitivity. To conclude, the prevention of HFD-induced muscular lipid accumulation and the improved whole body glucose tolerance are likely secondary effects due to the anorexic nature of ALA.-Timmers, S., J. de Vogel-van den Bosch, M. C. Towler, G. Schaart, E. Moonen-Kornips, R. P. Mensink, M. K. Hesselink, D. G. Hardie, and P. Schrauwen. Prevention of high-fat diet-induced muscular lipid accumulation in rats by alpha lipoic acid is not mediated by AMPK activation. J. Lipid Res. 2010. 51: 352-359.

    Original languageEnglish
    Pages (from-to)352-359
    Number of pages8
    JournalJournal of Lipid Research
    Volume51
    Issue number2
    DOIs
    Publication statusPublished - Feb 2010

    Keywords

    • AMP-activated protein kinase
    • intramyocellular lipid accumulation
    • glucose tolerance
    • PROTEIN-KINASE
    • SKELETAL-MUSCLE
    • DIABETES-MELLITUS
    • MITOCHONDRIAL BIOGENESIS
    • INSULIN SENSITIVITY
    • GLUCOSE-TRANSPORT
    • THIOCTIC ACID
    • FOOD-INTAKE
    • METABOLISM
    • EXPRESSION

    Cite this

    Timmers, S., de Vogel-van den Bosch, J., Towler, M. C., Schaart, G., Moonen-Kornips, E., Mensink, R. P., Hesselink, M. K., Hardie, D. G., & Schrauwen, P. (2010). Prevention of high-fat diet-induced muscular lipid accumulation in rats by alpha lipoic acid is not mediated by AMPK activation. Journal of Lipid Research, 51(2), 352-359. https://doi.org/10.1194/jlr.M000992