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Ion transport in ‘tight’ epithelial monolayers of MDCK cells

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Summary

Cultured monolayers of MDCK cells grown upon filter supports display many features ofin vivo epithelia. Previously reported values of transmonolayer resistance of 100 Ωcm−2 (Misfeldt, Hamamoto & Pitelka, 1976; Cereijido, Robbins, Dolan, Rotunno & Sabatini, 1978) indicate a leaky epithelium. This paper describes the properties of a strain of MDCK cells which displays entirely different electrophysiological properties. The results show that (i) the mean transmonolayer resistance is 4.16 kΩ cm−2, (ii) transmonolayer ion transport is of small magnitude since the mean spontaneous open circuit PD is only 2.17 mV basal surface positive and isotopic Na and Cl flux measurements fail to demonstrate a significant net flux, (iii) the action of ouabain, amiloride and ion substitutions are consistent with transmonolayer net Na movement being largely responsible for the spontaneous PD, and (iv) asymmetry in the localization of the Na-K ATPase is evident on the basis of3H-ouabain binding to cell monolayer.

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Simmons, N.L. Ion transport in ‘tight’ epithelial monolayers of MDCK cells. J. Membrain Biol. 59, 105–114 (1981). https://doi.org/10.1007/BF01875708

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  • DOI: https://doi.org/10.1007/BF01875708

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