Efficacy of glucose, ouabain and an aldose reductase inhibitor on 2-[3H] myo-inositol uptake by human, rat and rabbit erythrocytes |
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Authors: | N Hotta H Kakuta H Fukasawa M Kimura N Koh H Matsumae M Fujimaki N Sakamoto |
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Affiliation: | Third Department of Internal Medicine, Nagoya University School of Medicine, Japan. |
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Abstract: | Myo-inositol uptake by erythrocytes from humans, rabbits and rats was studied with an isotope technique. In human erythrocytes, the inhibitory effect on myo-inositol uptake was stronger with glucose than with ouabain. However, an aldose reductase inhibitor (ONO-2235, 100 microM) or insulin (200 microU/ml) failed to correct the decrease in myo-inositol uptake in packed RBC, produced by either 10 mM glucose or 2mM ouabain. Ten mM ouabain had an inhibitory effect on myo-inositol uptake in all species, but an inhibitory effect was not observed with 20 mM glucose in rabbit erythrocytes. The results suggest that myo-inositol uptake by erythrocytes may be dependent on the active transport system via sodium-ATPase and that erythrocytes may not be a suitable model to monitor the possible effect of an aldose reductase inhibitor on myo-inositol concentrations in other tissues concerned with diabetic complications. |
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