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LLC-PK1 epithelia as a model for in vitro assessment of proximal tubular nephrotoxicity

  • Cellular And Molecular Toxicology
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Summary

LLC-PK1 cells, an established epithelial cell line derived from pig kidney, were used as a model system for assessment of nephrotoxic side effects of three cephalosporin antibiotics: cephaloridine, ceftazidime, and cefotaxime. Toxic effects of these xenobiotics were monitored on confluent monolayers by light and electron microscopy and by the release of cellular marker enzyme activities into the culture medium. In addition, LLC-PK1 cells were grown on microporous supports, and cephalosporin-induced alteration of epithelial functional integrity was monitored by a novel electrophysiologic approach. For this purpose, an Ussing chamberlike experimental setup was used. The dose-dependent effects on transepithelial ionic permselectivity were monitored under conditions in which defined fractions of the apical culture medium NaCl contents were replaced iso-osmotically by mannitol. This method of determining the functional intactness of the epithelial barrier by measuring dilution potentials was found to be far more sensitive than monitoring cell injury by means of morphology or measurement of enzyme release. As expected from animal experimental data, a dose-dependent disruption of monolayer integrity was detected with all three methodologies applied. Cephaloridine was found the most toxic compound followed by ceftazidime, where a 3-fold, and cefotaxime, where a 10-fold dose of that of cephaloridine was needed to produce cell injury. Measurement of transepithelial dilution potentials was more sensitive as compared to the release of the apical plasma membrane marker enzyme activities alkaline phosphatase andγ-glutamyltranspeptidase, the cytosolic lactate dehydrogenase, or the mitochondrial glutamate dehydrogenase. The data were compared to the effects of the aminoglycoside antibiotic gentamicin, which at least with respect to its effects on LLC-PK1 morphology and enzyme release, but not transepithelial electrical properties, was already investigated.

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Authors and Affiliations

  1. Institute of Physiology, University of Innsbruck, Fritz-Preglstraße 3, A-6010, Innsbruck, Austria

    Dieter Steinmassl, Walter Pfaller & Gerhard Gstraunthaler

  2. Hoechst-Roussel Vienna, Austria

    Wolfgang Hoffmann

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  1. Dieter Steinmassl
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  2. Walter Pfaller
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  3. Gerhard Gstraunthaler
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  4. Wolfgang Hoffmann
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Steinmassl, D., Pfaller, W., Gstraunthaler, G. et al. LLC-PK1 epithelia as a model for in vitro assessment of proximal tubular nephrotoxicity. In Vitro Cell Dev Biol - Animal 31, 94–106 (1995). https://doi.org/10.1007/BF02633969

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  • DOI: https://doi.org/10.1007/BF02633969

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