Pflügers Archiv

, Volume 410, Issue 1–2, pp 192–197 | Cite as

Effects of dipyridamole on adenosine concentration, insulin sensitivity and glucose utilisation in soleus muscle of the rat

  • Fred J. Lozeman
  • R. A. John Challiss
  • Brendan Leighton
  • Eric A. Newsholme
Heart, Circulation, Respiration and Blood; Environmental and Exercise Physiology

Abstract

Adenosine has been shown to modulate the sensitivity of skeletal muscle to insulin (Budohoski et al. 1984). In an attempt to further characterize the modulatory action of adenosine on insulin sensitivity inskeletal muscle we have investigated the effect of the nucleoside transport inhibitor dipyridamole in isolated incubated soleus muscle strips. At a concentration of 50 μM, dipyridamole increased the concentration of adenosine in the soleus muscle by 36% and in the incubation medium by 32%. At this concentration of dipyridamole, the basal rates (in the presence of 1 μunit of insulin/ml) of lactate formation, 2-deoxy [2,6-3H]glucose phosphorylation and glucose oxidation were decreased by 48%, 43% and 47% respectively, whilst the rate of glycogen synthesis was unaffected. Insulin-stimulated rates (in the presence of 10000 μunit of insulin/ml) of lactate formation, 2-deoxy [2,6-3H] glucose phosphorylation, glycogen synthesis and glucose oxidation were decreased by 70%, 30%, 26% and 20% respectively in the presence of 50 μM dipyridamole. Although 50 μM dipyridamole was required to exert a significant effect on medium and soleus muscle adenosine concentrations, statistically significant effects on glycolytic rate were observed at concentrations as low as 2 μM dipyridamole.

It is concluded that the results are not consistent with dipyridamole exerting an effect on skeletal muscle carbohydrate metabolism solely through elevation of the intracellular or interstial adenosine concentration, but strongly suggest that dipyridamole inhibits glucose transport and/or phosphorylation in skeletal muscle.

Key words

Dipyridamole Insulin sensitivity Adenosine Glucose transport Skeletal muscle 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Fred J. Lozeman
    • 1
  • R. A. John Challiss
    • 1
  • Brendan Leighton
    • 1
  • Eric A. Newsholme
    • 1
  1. 1.Department of BiochemistryUniversity of OxfordOxfordUK

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