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Inhibition of 3H-demethylphalloin uptake in isolated rat hepatocytes under various experimental conditions

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Summary

3H-Demethylphalloin (3H-DMP) a cyclopeptide very similar to phalloidin is taken up by isolated hepatocytes in vitro. Hepatocytes prepared from newborn animals are less sensitive to phalloidin. Their uptake of 3H-DMP is about one tenth of that of cells from adult animals. Ascites hepatoma cells, known to be insensitive to phalloidin took up negligible amounts of 3H-DMP. Cells prepared from regenerating livers took up insignificantly lower amounts of the toxin than in hepatocytes from adult animals.

Treatment of hepatocytes with low concentrations of trypsin was found to switch off the phalloidin sensitivity in a reversible manner. This inhibition is due to a reduced uptake of 3H-DMP. Pretreatment of animals with CCl4, known to reduce the sensitivity to phalloidin, also decreases the uptake of 3H-DMP in isolated hepatocytes.

Various agents, drugs and reagents were found to inhibit the response of isolated hepatocytes to phalloidin. All these compounds (bile acids, rifampicin, silybin, DIDS, glutardialdehyde, bromosulphophthalein, fusidic acid, antamanide, novobiocin) inhibit also the uptake of 3H-DMP in isolated hepatocytes. The results confirm our working hypothesis, presented in several previous papers, that decreased sensitivity to phalloidin is probably due to a reduced or blocked uptake of the toxin.

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Authors and Affiliations

  1. Institut für Pharmakologie und Toxikologie im Fachbereich 18 der Justus-Liebig-Universität Giessen, Frankfurter Strasse 107, D-6300, Giessen, Federal Republic of Germany

    E. Petzinger, K. Ziegler & M. Frimmer

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  1. E. Petzinger
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  2. K. Ziegler
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  3. M. Frimmer
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This work was supported by the Deutsche Forschungsgemeinschaft

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Petzinger, E., Ziegler, K. & Frimmer, M. Inhibition of 3H-demethylphalloin uptake in isolated rat hepatocytes under various experimental conditions. Naunyn-Schmiedeberg's Arch. Pharmacol. 307, 275–281 (1979). https://doi.org/10.1007/BF00505944

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  • DOI: https://doi.org/10.1007/BF00505944

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