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Aldosterone-induced protein in toad urinary bladder.

W B Benjamin, I Singer

    Science (New York, N.Y.)
    |October 18, 1974
    PubMed
    Summary
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    Researchers found a specific protein that is produced when the hormone aldosterone is present. This protein, weighing about 12,000 Daltons, is linked to aldosterone's effect on toad urinary bladders.

    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Physiology

    Background:

    • Aldosterone is a key mineralocorticoid hormone regulating sodium and potassium balance.
    • Understanding the molecular mechanisms of aldosterone action is crucial for physiological research.

    Purpose of the Study:

    • To identify and characterize specific proteins induced by aldosterone in the toad urinary bladder.
    • To confirm the mineralocorticoid specificity of aldosterone-induced protein synthesis.

    Main Methods:

    • Simultaneous electrophysiological and biochemical experiments were performed on isolated toad (Bufo marinus) urinary hemibladders.
    • Radioactive methionine ([(35)S]) incorporation was used to measure protein synthesis.
    • Comparative studies with other hormones (dexamethasone, insulin) and inhibitory agents (spironolactone, actinomycin D) were conducted.

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    Main Results:

    • Aldosterone stimulation specifically increased the incorporation of [(35)S]methionine into a low-molecular-weight protein (approximately 12,000 Daltons).
    • This effect was observed concurrently with the stimulation of short-circuit current, indicating a functional link.
    • Dexamethasone and insulin did not induce the synthesis of this specific protein, and spironolactone and actinomycin D inhibited its production.

    Conclusions:

    • A specific aldosterone-induced protein of approximately 12,000 molecular weight was identified in the toad urinary bladder.
    • The results strongly suggest that the synthesis of this protein is specific to mineralocorticoid action.
    • This finding contributes to understanding the molecular basis of aldosterone-regulated ion transport.