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Do thiazides reduce intestinal oxalate absorption?: a study in vitro using rabbit colon

M Hatch1, N D Vaziri

  • 1Department of Medicine, University of California at Irvine 92717.

Clinical Science (London, England : 1979)
|March 1, 1994
PubMed
Summary

Certain diuretics, like trichlormethiazide, can inhibit intestinal oxalate absorption, particularly in the colon. This suggests diuretics may not be the primary cause of reduced oxalate levels observed in patients.

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Area of Science:

  • Nephrology
  • Gastroenterology
  • Pharmacology

Background:

  • Diuretics are commonly prescribed for various conditions.
  • Some diuretics have been anecdotally linked to reduced urinary oxalate levels (hypooxaluric effects).
  • The intestinal tract plays a role in oxalate absorption and excretion.

Purpose of the Study:

  • To investigate the direct effects of different diuretics on intestinal oxalate transport.
  • To determine if diuretics impact oxalate absorption in specific segments of the intestine.
  • To clarify the mechanism behind the observed hypooxaluric effects of certain diuretics.

Main Methods:

  • Isolated rabbit intestinal tissue segments were mounted in Ussing chambers.
  • Transmural oxalate fluxes were measured under short-circuited conditions.

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  • The effects of various diuretics, including trichlormethiazide, were assessed at different concentrations.

    • Main Results:

    • Trichlormethiazide significantly reduced net oxalate absorption in the distal colon at 10(-4) mol/l.
    • Other thiazide diuretics showed inhibitory effects on colonic oxalate absorption at higher concentrations (10(-3) to 10(-2) mol/l).
    • No significant effects on oxalate transport were observed in other intestinal segments.

    Conclusions:

    • The hypooxaluric effects of hydrochlorothiazide and chlorthalidone are unlikely to be solely due to direct effects on intestinal oxalate transport.
    • Thiazide-induced reductions in colonic oxalate absorption may involve the oxalate efflux transporter on the basolateral membrane of colonocytes.
    • Further research is needed to fully elucidate the mechanisms behind diuretic-induced changes in oxalate homeostasis.