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Parathyroid hormone-induced changes of the brush border topography and cytoskeleton in cultured renal proximal tubular cells

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Summary

In order to examine the possibility of parathyroid hormone-mediated ultrastructural rearrangements in target epithelium, isolated canine renal proximal tubular cells were grown on a collagen-coated semipermeable membrane in a defined medium. Scanning and transmission electron microscopy of these monolayers revealed abundant microvilli. Exposure of the proximal tubular cells to parathyroid hormone resulted in a biphasic changes involving: (1) dramatic shortening and rarefaction of microvilli within 1 min; and (2) recovery of microvillar topography after 5 min. A similar shortening of microvilli was observed following exposure to ionomycin, whereas incubation with cyclic AMP resulted in an elongation of microvilli. Parathyroid hormone stimulated cyclic AMP production and increased cytoplasmic free calcium concentration in cultured proximal tubular cells. Pretreatment of cells with a calmodulin inhibitor abolished the effect of parathyroid hormone on brush border topography. Shortening of microvilli was associated with a disappearance of microvillar core filaments. Staining of F-actin with fluoresceinphalloidin showed that parathyroid hormone resulted in fragmentation of stress fibers. It is concluded that parathyroid hormoneinduced cell activation involves cytoplasmic-free calcium, calmodulin, and the cytoskeleton.

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Authors and Affiliations

  1. Division of Nephrology, Jewish Hospital of St. Louis, 63110, St. Louis, Missouri

    Michael S. Goligorsky & Keith A. Hruska

  2. Department of Anatomy and Neurobiology, Washington University School of Medicine, 63110, St. Louis, Missouri

    David N. Menton

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  1. Michael S. Goligorsky
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  2. David N. Menton
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  3. Keith A. Hruska
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Goligorsky, M.S., Menton, D.N. & Hruska, K.A. Parathyroid hormone-induced changes of the brush border topography and cytoskeleton in cultured renal proximal tubular cells. J. Membrain Biol. 92, 151–162 (1986). https://doi.org/10.1007/BF01870704

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  • DOI: https://doi.org/10.1007/BF01870704

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