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The Journal of Membrane Biology

, Volume 59, Issue 1, pp 13–18 | Cite as

Transepithelial transport in cell culture:d-Glucose transport by a pig kidney cell line (LLC-PK1)

  • Dayton S. Misfeldt
  • Martin J. Sanders
Articles
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Summary

The pig kidney cell line LLC-PK1 cultured on a collagen coated membrane filter formed a continuous sheet of oriented asymmetrical epithelial cells joined by occluding junctions. A transepithelial electrical potential (PD) and short-circuit current (SCC) were dependent on the presence of Na and sugar in the apical bathing solution. In the presence of 5.5mm d-glucose, a PD of 2.8 mV, apical surface negative, a SCC of 13 μA cm−2 and transepithelial resistance of 211 ohm·cm2 were recorded. The SCC was promptly reduced by the addition of phlorizin to the apical bath but unaffected when placed in the basolateral bath. The effect on SCC of various sugars was compared by the concentrations required for half-maximal SCC: 0.13mm β-methyl-d-glucoside, 0.28mm d-glucose, 0.65mm α-methyl-d-glucoside, 0.77mm 6-deoxy-d-glucose, 4.8mm d-galactose, and 29mm 3-O-methyl-glucose. When [Na] was reduced, the concentration ofd-glucose required for half-maximal SCC increased. Isotopically labeled3H and14Cd-glucose were used to simultaneously determine bidirectional fluxes; a resultant net apical-to-basolateral transport was present and abolished by phlorizin. The transported isotope cochromatographed with labeledd-glucose, indicating negligible metabolism of transported glucose. The pig kidney cell line, LLC-PK1, provides a cell culture model for the investigation of mechanisms of transepithelial glucose transport.

Key words

Hexoses short-circuit current transepithelial transport phlorizin sodium dependent 
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Copyright information

© Springer-Verlag New York Inc 1981

Authors and Affiliations

  • Dayton S. Misfeldt
    • 1
    • 2
  • Martin J. Sanders
    • 1
    • 2
  1. 1.Department of Medicine (Oncology)Stanford University School of MedicineStanford
  2. 2.Palo Alto Veterans Administration Medical CenterPalo Alto

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