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Effect of atrial peptide on collecting duct function
1Department of Physiology, University of Melbourne, Parkville, Victoria, Australia.
Clinical and Experimental Pharmacology & Physiology
|November 1, 1988
Summary
Atrial natriuretic peptides (ANP) did not directly change sodium or chloride permeability in rat kidney tubules. In rabbits, ANP caused natriuresis without altering sodium reabsorption capacity in collecting ducts.
Area of Science:
- Nephrology
- Renal Physiology
- Endocrinology
Background:
- Atrial natriuretic peptides (ANP) are implicated in regulating sodium and water balance.
- Previous studies suggest ANP influences sodium transport in the medullary collecting ducts.
Purpose of the Study:
- To investigate the direct effects of ANP on ion and water permeability in rat kidney collecting ducts.
- To examine the in vivo impact of ANP on sodium handling in rabbit nephrons.
Main Methods:
- In vitro microperfusion of rat papillary collecting ducts to assess 22Na+, 36Cl-, and THO permeability.
- In vivo administration of ANP to rabbits during water diuresis to measure stop-flow sodium concentrations and renal function.
Main Results:
- ANP did not alter the diffusional permeability of 22Na+, 36Cl-, or THO in isolated rat collecting ducts.
- In vivo, ANP induced natriuresis, increased urine flow and potassium excretion, but did not affect stop-flow sodium reabsorption or sodium permeability in rabbit collecting tubules.
- ANP did not inhibit vasopressin-stimulated water permeability in collecting ducts.
Conclusions:
- Direct effects of ANP on collecting duct permeability to sodium, chloride, and water could not be demonstrated in vitro.
- The natriuretic effect of ANP in vivo may not be mediated by direct alterations in the sodium reabsorptive capacity or permeability of the terminal collecting tubules and ducts.
- Further research may be needed to explore ANP's effects within the functional context of the renal medulla.