Na+-Dependent Transport of Carbohydrates through Intestinal Epithelium

  • Robert K. Crane
Conference paper


Several years ago, my colleagues and I presented a concept of the brush border membrane of the epithelial cell as a digestive-absorptive surface in which the elements responsible for digestion and absorption were postulated to be arranged in ordered proximity to one another (Crane, Miller and Bihlekr 1961, Crane 1962). The disaccharidases were represented as being an integral part of the outer protein coat of the membrane and the diffusion barrier to the entry of monosaccharides into the epithelial cells was assumed, in line with current concepts of membrane function, to be the lipid leaflet. As a consequence of experiments carried out under conditions of limited tissue energy supplies, we believed that the entry of sugars across the brush border membrane was identified as the primary site of Na+ involvement in the overall process of active transport, and we interpreted our experiments to have “established the existence of a substrate-specific, Na+-dependent and energy-independent process mediating the rapid equilibration of sugars between the cells and the medium” (Bihler, Hawkins and Crane 1962). Interaction of glucose and its analogs with a specific binding site on a mobile carrier was postulated to account for the specificity of the overall process (Crane 1960) and for the competitive nature of phlorizin inhibition (Alvarado and Crane 1962).


Mobile Carrier Brush Border Membrane Sugar Transport Loaded Carrier Dependent Transport 
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Copyright information

© Springer-Verlag/Wien 1967

Authors and Affiliations

  • Robert K. Crane
    • 1
  1. 1.Department of BiochemistryThe Chicago Medical SchoolChicagoUSA

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