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- W2010551151 abstract "(1) 4,6-O-Ethylidene-d-glucose is a good inhibitor of adipocyte sugar transport from the external surface. Using radioactively labelled 4,6-O-methylidene-d-glucose we have shown that this compound is not taken up into cells by the hexose transporter but through a route which is insulin insensitive, d-glucose insensitive, temperature sensitive and which is slightly inhibited by phloretin. When efflux of 3-O-methyl-d-glucose is studied with 4,6-O-methylidene-d-glucose only present inside the cells then no detectable inhibition is observed indicating that this compound is a good side-specific analogue with a high affinity for only the external site of the hexose transporter. (2) Radioactively labelled alkyl-β-d-glucosides have been prepared. These also penetrate the adipocyte membrane by an insulin and d-glucose insensitive route. The half-times for equilibration with methyl-, n-propyl-, and n-butyl-β-d-glucosides are 255, 9.45 and 3.3 min, respectively, indicating that the uptake rates are dependent upon the size of the alkyl group. (3) The glucosides show poor inhibition of 3-O-methyl-d-glucose transport when added to the external solution only. When cells are preincubated with n-propyl-β-d-glucoside and n-butyl-β-d-glucoside an increase in the amount of inhibition of 3-O-methyl-d-glucosez uptake is observed. This increase in inhibition correlates well with the glucoside uptake rates and indicates that availability of the glucosides at the internal surface of the transporter is required for inhibition. This has been confirmed by measuring 3-O-methyl-d-glucose exit in the presence of n-propyl-β-d-glucoside at the internal surface only. Thus, n-propyl-β-d-glucoside is a good side-specific analogue with high affinity only for the internal site of the hexose transporter. (4) n-Propyl-β-d-glucoside inhibition of d-allose transport is fully reversible. If cells are washed after a preincubation with the analogue then the inhibition is lost. The n-propyl-β-d-glucoside inhibition of d-allose transport is reduced competitively by 3-O-methyl-d-glucose. (5) 6-O-Propyl-d-galactose has low affinity for both internal and external sites." @default.
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- W2010551151 date "1982-02-01" @default.
- W2010551151 modified "2023-10-16" @default.
- W2010551151 title "Side-specific analogues for the rat adipocyte sugar transport system" @default.
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- W2010551151 doi "https://doi.org/10.1016/0005-2736(82)90037-2" @default.
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