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Related Experiment Videos

Cilastatin-insulin interaction in the rat.

G C Tompkins1, L J Brunner, D R Luke

  • 1Department of Pharmaceutics, College of Pharmacy, University of Houston, TX 77030.

Drug Metabolism and Disposition: the Biological Fate of Chemicals
|January 1, 1989
PubMed
Summary

Cilastatin, a dehydropeptidase I inhibitor, significantly reduced insulin clearance in rats with hyperinsulinemia. This suggests cilastatin may increase hypoglycemia risk in patients with elevated insulin levels.

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Area of Science:

  • Pharmacology
  • Nephrology
  • Endocrinology

Background:

  • Insulin pharmacokinetics and pharmacodynamics are crucial for metabolic control.
  • Renal dehydropeptidase I inhibitors, like cilastatin, can impact drug metabolism.
  • The effect of cilastatin on insulin handling in vivo is not well understood.

Purpose of the Study:

  • To investigate the impact of cilastatin on insulin pharmacokinetics and pharmacodynamics in rats.
  • To determine if cilastatin affects insulin clearance and glucose homeostasis.

Main Methods:

  • Intact rat model infused with saline or insulin to steady state.
  • Administration of cilastatin (25 mg/kg, IV) or saline.
  • Collection of blood and urine samples to measure insulin, glucose, and creatinine levels.

Main Results:

  • Cilastatin did not alter insulin or glucose handling in rats without hyperinsulinemia.
  • In rats with elevated insulin levels, cilastatin decreased fractional urinary insulin clearance by 2-fold (p=0.0026).
  • No changes in renal function (creatinine clearance, sodium transport) were observed.

Conclusions:

  • Cilastatin administration can reduce the renal clearance of insulin in hyperinsulinemic states.
  • This reduction in insulin clearance may lead to profound hypoglycemia in patients with hyperinsulinemia.
  • Further clinical studies are warranted to confirm these findings in humans.

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