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Related Experiment Videos

Correlation between decrease of 11beta-hydroxysteroid dehydrogenase activity and hypokalemia induced by furosemide in

B Yao1, Y D Zhang, J P Shen

  • 1Institute of Clinical Pharmacology, Nanjing Medical University, Nanjing 210029, China.

Acta Pharmacologica Sinica
|December 26, 2001
PubMed
Summary
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Furosemide (Fur) reduces 11beta-hydroxysteroid dehydrogenase (11beta-HSD) activity in rats, leading to hypokalemia. This inhibition of renal 11beta-HSD activity is a potential new mechanism for furosemide-induced hypokalemia.

Area of Science:

  • Biochemistry
  • Pharmacology
  • Renal Physiology

Background:

  • Furosemide (Fur) is a potent diuretic known to cause hypokalemia.
  • The precise biochemical mechanisms underlying furosemide-induced hypokalemia require further elucidation.
  • 11beta-hydroxysteroid dehydrogenase (11beta-HSD) plays a crucial role in regulating corticosteroid activity in the kidneys.

Purpose of the Study:

  • To investigate the correlation between decreased 11beta-hydroxysteroid dehydrogenase (11beta-HSD) activity and furosemide (Fur)-induced hypokalemia in a rat model.
  • To explore the role of renal 11beta-HSD inhibition in the development of hypokalemia.

Main Methods:

  • Sprague-Dawley (SD) rats were administered single or multiple doses of furosemide (Fur) via gavage.
  • 11beta-HSD activity was assessed by measuring the urinary ratio of 11-dehydrocorticosterone (A) to corticosterone (B).

Related Experiment Videos

  • Renal cortical microsomes were used to determine the conversion rate of corticosterone (B) to 11-dehydrocorticosterone (A) using High-Performance Liquid Chromatography (HPLC).

    • Main Results:

    • Furosemide administration significantly reduced the urinary A/B ratio and the conversion rate of B to A in renal microsomes.
    • Multiple doses of furosemide led to a significant reduction in serum potassium levels.
    • The decrease in serum potassium was positively correlated with the reduction in 11beta-HSD activity, indicated by lower A/B ratios and B to A conversion rates.

    Conclusions:

    • The inhibition of renal 11beta-HSD activity is a significant finding in this study.
    • This inhibition represents a potential novel biochemical mechanism contributing to furosemide-induced hypokalemia.
    • Further research into this mechanism could inform strategies for managing diuretic-induced electrolyte imbalances.