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Phosphodiesterase activator from rat kidney cortex.

G J Strewler, V C Manganiello, M Vaughan

    The Journal of Biological Chemistry
    |January 25, 1978
    PubMed
    Summary
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    A novel kidney phosphodiesterase activator was identified, distinct from calcium-dependent activators. This activator enhances cyclic AMP phosphodiesterase activity in rat renal cortex homogenates, suggesting a new regulatory mechanism.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Renal Physiology

    Background:

    • Cyclic AMP phosphodiesterase (cAMP PDE) regulates intracellular signaling pathways.
    • Understanding cAMP PDE regulation in the kidney is crucial for comprehending renal function.

    Purpose of the Study:

    • To identify and characterize novel regulators of cAMP PDE activity in rat renal cortex.
    • To investigate the mechanism of cAMP PDE activation in renal tissue.

    Main Methods:

    • Incubation of rat renal cortex homogenates and fractions under varying tonicity.
    • Extraction and characterization of a heat-labile, EGTA-insensitive phosphodiesterase activator.
    • Chromatographic separation (DEAE-Bio-Gel) and sucrose density gradient centrifugation of phosphodiesterase isoforms.

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    Main Results:

    • Hypotonic conditions released a heat-labile activator from particulate fractions, increasing supernatant cAMP PDE activity.
    • This kidney activator is distinct from known heat-stable, calcium-dependent activators.
    • A specific cAMP PDE sensitive to the kidney activator was identified and separated from other PDE forms.
    • Activation by the kidney activator resulted in a decreased sedimentation velocity of the phosphodiesterase.

    Conclusions:

    • Rat renal cortex contains a novel, heat-labile activator of cAMP phosphodiesterase.
    • This activator likely plays a role in regulating renal cAMP levels through a calcium-independent mechanism.
    • The activated phosphodiesterase exhibits altered physical properties, suggesting a conformational change upon activation.