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Thiazides stimulate calcium absorption in the turtle bladder.

S Sabatini1, N A Kurtzman

  • 1Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock.

Kidney International
|May 1, 1988
PubMed
Summary
This summary is machine-generated.

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Hydrochlorothiazide (HTZ), a thiazide diuretic, directly stimulates calcium absorption in the turtle bladder by increasing luminal membrane permeability. This effect on calcium transport is independent of sodium transport and proton secretion.

Area of Science:

  • Nephrology
  • Pharmacology
  • Cell Physiology

Background:

  • The precise mechanism by which thiazide diuretics influence calcium transport remains unclear.
  • Understanding this interaction is crucial for managing conditions related to calcium balance and diuretic use.

Purpose of the Study:

  • To investigate the effect of hydrochlorothiazide (HTZ) on sodium transport, proton secretion, and calcium-45 (Ca45) flux in the turtle bladder.
  • To elucidate the role of the luminal membrane in thiazide-mediated calcium absorption.

Main Methods:

  • Experiments were conducted using the turtle bladder, a high-resistance membrane model.
  • Unidirectional Ca45 fluxes and Na transport were measured following mucosal or serosal addition of HTZ.
  • The impact of ouabain, an inhibitor of active Na transport, on HTZ's effects was assessed.

Related Experiment Videos

Main Results:

  • Mucosal hydrochlorothiazide (HTZ) significantly increased mucosa-to-serosa Ca45 flux, indicating enhanced calcium absorption.
  • This stimulatory effect on calcium transport persisted even in the presence of ouabain, suggesting independence from active Na transport.
  • HTZ did not affect Na transport, proton secretion, or serosa-to-mucosa Ca45 flux, and tissue Ca45 content increased.

Conclusions:

  • Thiazide diuretics, such as HTZ, appear to directly stimulate calcium absorption at the luminal membrane.
  • The mechanism may involve an increase in mucosal calcium permeability.
  • These findings provide new insights into the luminal actions of thiazides on calcium transport.