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Am J Physiol Endocrinol Metab 0: 1672001, 2002. doi:10.1152/ajpendo.00167.2001
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282/6/E1291
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Vol. 282, Issue 6, E1291-E1300, June 2002

Effect of fiber type and nutritional state on AICAR- and contraction-stimulated glucose transport in rat muscle

Hua Ai1,3, Jacob Ihlemann1, Ylva Hellsten2, Hans P. M. M. Lauritzen1, D. Grahame Hardie4, Henrik Galbo1, and Thorkil Ploug1

1 Copenhagen Muscle Research Centre, Department of Medical Physiology, Panum Institute, DK-2200, Copenhagen, and 2 Department of Human Physiology, August Krogh Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark; 3 Institute of Sports Medicine, Third Hospital, Beijing University, 100083 Beijing, China; and 4 Division of Molecular Physiology, School of Life Sciences, Wellcome Trust Biocentre, Dundee University, Dundee DD1 5EH, Scotland, United Kingdom

AMP-activated protein kinase (AMPK) may mediate the stimulatory effect of contraction and 5-aminoimidazole-4-carboxamide ribonucleoside (AICAR) on glucose transport in skeletal muscle. In muscles with different fiber type composition from fasted rats, AICAR increased 2-deoxyglucose transport and total AMPK activity approximately twofold in epitrochlearis (EPI), less in flexor digitorum brevis, and not at all in soleus muscles. Contraction increased both transport and AMPK activity more than AICAR did. In EPI muscles, the effects of AICAR and contractions on glucose transport were partially additive despite a lower AMPK activity with AICAR compared with contraction alone. In EPI from fed rats, glucose transport responses were smaller than what was seen in fasted rats, and AICAR did not increase transport despite an increase in AMPK activity. AICAR and contraction activated both alpha 1- and alpha 2-isoforms of AMPK. Expression of both isoforms varied with fiber types, and alpha 2 was highly expressed in nuclei. In conclusion, AICAR-stimulated glucose transport varies with muscle fiber type and nutritional state. AMPK is unlikely to be the sole mediator of contraction-stimulated glucose transport.

glycogen; diet; metabolism; signaling; GLUT4


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