Summary
Glucose uptake into plasma membrane vesicles from the maternal surface of the human placenta was measured with the Millipore filtration technique. Uptake ofd-glucose was dependent on the osmolarity of the incubation medium surrounding the vesicles. Uptake ofd-glucose exceeded that ofl-glucose. The uptake ofd-glucose was not enhanced by placing 100mm NaCl or NaSCN in the medium outside the vesicles (none inside) at the onset of uptake determinations.d-glucose transport was inhibited by cytochalasin B; phloretin, phlorizin, and 1-fluoro-2,4-dinitrobenzene.d-glucose uptake was inhibited by 2-deoxy-d-glucose, 3-O-methyl-d-glucose and to a lesser extent byd-galactose. It was not inhibited by α-methyl-d-glucoside. Cytochalasin B binding to the vesicles was 30% inhibited in the presence of 80mm d-glucose. The results indicate that the system for facilitated transport ofd-glucose at the maternal face of the placenta is distinctly different from that on the brush-border membrane of intestine or renal tubule and more closely resembles that of human erythrocyte.
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Bissonnette, J.M., Black, J.A., Wickham, W.K. et al. Glucose uptake into plasma membrane vesicles from the maternal surface of human placenta. J. Membrain Biol. 58, 75–80 (1981). https://doi.org/10.1007/BF01871036
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DOI: https://doi.org/10.1007/BF01871036