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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Role of Sodium Depletion in Acute Antidiuretic Effect of Bendroflumethiazide in Rats with Nephrogenic Diabetes Insipidus

Nadeem R. Janjua, Thomas E. N. Jonassen, Susanna Langhoff, Klaus Thomsen and Sten Christensen
Journal of Pharmacology and Experimental Therapeutics October 2001, 299 (1) 307-313;
Nadeem R. Janjua
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Thomas E. N. Jonassen
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Susanna Langhoff
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Klaus Thomsen
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Sten Christensen
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Abstract

The mechanisms underlying the acute antidiuretic response to bendroflumethiazide (BFTZ; 0.25 mg/h for 3 h) in rats with nephrogenic diabetes insipidus (NDI) was investigated. NDI was induced in conscious chronically instrumented female Wistar rats either by chronic lithium administration (40–60 mmol Li/kg of diet for 4 weeks) or by acute infusion of V2 antagonist OPC-31260 (0.2 mg/h). Renal clearance experiments were performed in conscious rats instrumented with permanent catheters. During experiments total body water content was held constant by i.v. replacement of urine production (V) with 150 mM glucose. One group in addition received i.v. replacement of urinary sodium losses. In both models of NDI, BFTZ-induced antidiuresis was associated with a decrease in the delivery of tubular fluid to the distal nephron, as measured by lithium clearance (CLi). Both the antidiuresis and the decrease in CLi could be prevented by sodium replacement. BFTZ did not affect distal water handling as measured by V/CLi. BFTZ did not induce antidiuresis in normal rats with water diuresis. It is concluded that in rats with NDI, thiazide-induced antidiuresis can be entirely explained by a fall in distal delivery of tubular fluid related to sodium depletion. This contrasts the response in rats with central diabetes insipidus, where thiazides in addition increase distal water reabsorption.

Footnotes

  • This work received financial support from the Novo Nordisk Foundation and the Danish Medical Research Council.

  • Abbreviations:
    ADH
    antidiuretic hormone
    BFTZ
    bendroflumethiazide
    DI
    diabetes insipidus
    C
    renal clearance
    CDI
    central diabetes insipidus
    ERPF
    effective renal plasma flow
    GFR
    glomerular filtration rate
    HCTZ
    hydrochlorothiazide
    NDI
    nephrogenic diabetes insipidus
    V
    urine flow rate
    TZ
    thiazide
    AQP2
    aquaporin-2
    • Received March 2, 2001.
    • Accepted June 14, 2001.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 299 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 299, Issue 1
1 Oct 2001
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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Role of Sodium Depletion in Acute Antidiuretic Effect of Bendroflumethiazide in Rats with Nephrogenic Diabetes Insipidus

Nadeem R. Janjua, Thomas E. N. Jonassen, Susanna Langhoff, Klaus Thomsen and Sten Christensen
Journal of Pharmacology and Experimental Therapeutics October 1, 2001, 299 (1) 307-313;

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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Role of Sodium Depletion in Acute Antidiuretic Effect of Bendroflumethiazide in Rats with Nephrogenic Diabetes Insipidus

Nadeem R. Janjua, Thomas E. N. Jonassen, Susanna Langhoff, Klaus Thomsen and Sten Christensen
Journal of Pharmacology and Experimental Therapeutics October 1, 2001, 299 (1) 307-313;
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