The PPARdelta agonist, GW501516, promotes fatty acid oxidation but has no direct effect on glucose utilisation or insulin sensitivity in rat L6 skeletal muscle cells.
Peroxisome proliferator-activated receptor-delta (PPARdelta) activation enhances skeletal muscle fatty acid oxidation and improves whole body glucose homeostasis and insulin sensitivity. Recently, GW501516, a selective PPARdelta agonist, was reported to increase glucose uptake in human skeletal myotubes by an AMPK-dependent mechanism that may contribute to the improved glucose tolerance. Here, we demonstrate that whilst GW501516 increases expression of PGC-1alpha and CPT-1 and stimulates fatty-acid oxidation in L6 myotubes, it fails to enhance insulin sensitivity, AMPK activity or glucose uptake and storage. Our findings exclude sarcolemmal glucose transport as a potential target for the therapeutic action of PPARdelta agonists in skeletal muscle.
Dimopoulos
Nikolaos
N
Division of Molecular Physiology, Sir James Black Centre, College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom.
Watson
Maria
M
Green
Charlotte
C
Hundal
Harinder S
HS
D000818:Animals; D002334:Carnitine O-Palmitoyltransferase / Q000378:metabolism; D002460:Cell Line; D005227:Fatty Acids / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism*; D006003:Glycogen / Q000096:biosynthesis; D007328:Insulin / Q000494:pharmacology*; D018485:Muscle Fibers, Skeletal / Q000187:drug effects / Q000378:metabolism; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000378:metabolism; D010084:Oxidation-Reduction / Q000187:drug effects; D047494:PPAR delta / Q000819:agonists* / Q000378:metabolism*; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D016601:RNA-Binding Proteins / Q000378:metabolism; D051381:Rats; D012680:Sensitivity and Specificity; D013844:Thiazoles / Q000494:pharmacology*; D014157:Transcription Factors / Q000378:metabolism
D005227:Fatty Acids; C425931:GW 501516; D007328:Insulin; D047494:PPAR delta; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; C501429:Ppargc1a protein, rat; D016601:RNA-Binding Proteins; D013844:Thiazoles; D014157:Transcription Factors; D006003:Glycogen; D002334:Carnitine O-Palmitoyltransferase; D005947:Glucose