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Related Experiment Videos

Intranephronic calculosis in rats: an ultrastructural study

H T Nguyen, J C Woodard

    The American Journal of Pathology
    |July 1, 1980
    PubMed
    Summary

    Hydroxyapatite intratubular lithiasis in rats begins with ultrastructural changes in proximal tubular cells, including increased calcium. These changes lead to microvesicle formation and the initiation of kidney stone development within the nephron.

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    Area of Science:

    • Nephrology
    • Cell Biology
    • Mineral Metabolism

    Background:

    • Intratubular lithiasis, or kidney stone formation within tubules, is a pathological process.
    • Understanding the early cellular events leading to stone formation is crucial for developing preventative strategies.

    Purpose of the Study:

    • To investigate the ultrastructural changes in proximal tubular cells preceding hydroxyapatite intratubular lithiasis.
    • To elucidate the initial mechanism of microurolith formation within the rat nephron.

    Main Methods:

    • Female Sprague-Dawley rats were fed a purified diet for 18 days.
    • Kidney tissues were examined using light and electron microscopy to identify early calcific lesions and cellular alterations.

    Main Results:

    • Earliest calcific lesions were observed by light microscopy on Day 12.
    • Ultrastructural changes in proximal tubular cells, including increased intracellular calcium and microvilli vesiculation, preceded intraluminal microlith formation.
    • Microvesicles, formed by shedding of vesiculated microvilli, initiated microurolith formation in Segment I of the proximal tubule.
    • Microliths grew as they traveled down the nephron, eventually impeding passage through the loop of Henle.

    Conclusions:

    • Microvesicles derived from proximal tubular cells are the primary initiators of hydroxyapatite intratubular lithiasis.
    • The process involves a sequence of cellular injury, microvesicle shedding, and subsequent aggregation leading to stone formation.
    • Early detection of cellular changes may offer therapeutic targets for preventing kidney stone disease.

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