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Related Experiment Videos

High-affinity Ca-Mg-ATPase along the rabbit nephron.

A Doucet, A I Katz

    The American Journal of Physiology
    |April 1, 1982
    PubMed
    Summary

    A calcium-magnesium ATPase (Ca-Mg-ATPase) was identified in the rabbit nephron, crucial for maintaining calcium balance and transport. Its activity levels vary across nephron segments, supporting active calcium extrusion.

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    Nephrologie·2003

    Area of Science:

    • Nephrology
    • Cell Physiology
    • Biochemistry

    Background:

    • Cellular calcium homeostasis is vital for kidney function.
    • Calcium extrusion against electrochemical gradients requires active transport mechanisms.
    • A potential role for a Ca2+-activated membrane Ca-ATPase in nephron calcium transport has been proposed.

    Purpose of the Study:

    • To investigate the presence and activity of a Ca2+-activated Ca-Mg-ATPase in the rabbit nephron.
    • To determine the distribution and kinetic properties of this enzyme across different nephron segments.

    Main Methods:

    • Enzyme assays were performed on various segments of the rabbit nephron.
    • Magnesium-dependent ATPase activity was measured and characterized.
    • Inhibitor sensitivity (ouabain, vanadate, ruthenium red, sodium azide) was assessed.

    Main Results:

    • A Ca-Mg-ATPase was detected in all rabbit nephron segments, with maximal activation at 1.1–2.3 µM Ca2+.
    • Enzyme activity varied significantly, highest in the distal convoluted tubule and cortical collecting tubule.
    • The enzyme was insensitive to ouabain and vanadate but inhibited by ruthenium red, suggesting plasma membrane localization.

    Conclusions:

    • The identified Ca-Mg-ATPase is present throughout the rabbit nephron.
    • Segmental differences in enzyme activity correlate with known calcium transport functions.
    • The enzyme's activity is sufficient to account for the active component of calcium flux in the nephron.

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