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Activation of osmolyte efflux from cultured renal papillary epithelial cells

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Summary

The rabbit renal papillary epithelial cell line PAP-HT25 accumulates sorbitol and other organic osmolytes when cultured in hypertonic media. When returned to isotonic media, PAP-HT25 cells swell because of water influx and then shrink to their normal volume because of rapid osmolyte and water efflux (volume regulatory decrease, VRD). Sorbitol efflux from PAP-HT25 cells during VRD was reduced to 18% of control by incubation of the cells with 100 μm eicosatetraynoic acid (ETYA), indicating that an enzyme that metabolizes arachidonic acid (AA) is a key component of the efflux process. Sorbitol efflux was unaffected by incubation with cyclooxygenase and lipoxygenase inhibitors but was reduced to 9% by incubation with 100 μm ketoconazole and to 37% by incubation with 100 μm SKF-525A, indicating that the cytochrome P-450 limb of the AA cascade is involved in the efflux process. The efflux of other organic osmolytes betaine and myoinositol, but not glycerolphosphorylcholine, was also inhibited by incubation with ETYA and ketoconazole.

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Authors and Affiliations

  1. Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung and Blood Institute, National Institutes of Health, 20892, Bethesda, Maryland

    Timothy J. Furlong, Toshiki Moriyama & Kenneth R. Spring

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Furlong, T.J., Moriyama, T. & Spring, K.R. Activation of osmolyte efflux from cultured renal papillary epithelial cells. J. Membrain Biol. 123, 269–277 (1991). https://doi.org/10.1007/BF01870410

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  • DOI: https://doi.org/10.1007/BF01870410

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