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Related Experiment Videos

Renal responses to diuretics in the turtle.

G A Stephens, F M Robertson

    Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
    |January 1, 1985
    PubMed
    Summary

    Diuretics furosemide and ethacrynic acid increased urine output and electrolyte excretion in freshwater turtles without affecting blood pressure or plasma renin activity. These drugs primarily impact the turtle

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    Area of Science:

    • Comparative physiology
    • Renal physiology
    • Diuretic drug action

    Background:

    • Freshwater turtles lack a loop of Henle, a key renal structure in mammals.
    • Understanding diuretic effects in species with unique renal anatomy is crucial for comparative physiology.

    Purpose of the Study:

    • To investigate the effects of furosemide and ethacrynic acid on renal function in freshwater turtles.
    • To assess changes in plasma renin activity (PRA) in response to these diuretics.
    • To elucidate the sites of action for these diuretics in a species lacking a loop of Henle.

    Main Methods:

    • Conscious freshwater turtles were administered furosemide and ethacrynic acid at varying doses (2 and 5 mg/kg).
    • Renal function parameters including glomerular filtration rate (GFR), urine volume, and electrolyte excretion were measured.
    • Plasma electrolytes and plasma renin activity (PRA) were analyzed.

    Main Results:

    • Furosemide significantly increased urine volume and sodium, chloride, and potassium excretion, with net potassium secretion observed.
    • Ethacrynic acid dose-dependently increased GFR, urine volume, and electrolyte excretion, also resulting in net potassium secretion.
    • Neither diuretic altered blood pressure, hematocrit, plasma electrolytes, or PRA.

    Conclusions:

    • Furosemide and ethacrynic acid inhibit tubular reabsorption in turtles, acting mainly on distal nephron segments.
    • The lack of PRA alteration suggests turtles may lack a tubular mechanism for regulating renin release.
    • These findings highlight the distinct renal handling of diuretics in species with divergent nephron structures.

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