Journal article
Renal mechanism of action of rat atrial natriuretic factor
The Journal of clinical investigation, Vol.75(2), pp.769-773
1985
DOI: 10.1172/JCI111759
PMCID: PMC423577
PMID: 3156153
Abstract
There has been conflict as to whether crude extracts of atrial natriuretic factor increase renal solute excretion by a hemodynamic mechanism or by direct inhibition of tubular transport. To investigate this issue, seven rats were studied during a euvolemic control period and following continuous administration of pure, synthetic 24 amino acid atrial natriuretic factor. A 10-25-fold increase in urinary sodium and chloride excretion occurred with a brisk kaliuresis but little bicarbonaturia. Atrial natriuretic factor caused whole kidney glomerular filtration rate to increase from 1.17 +/- 0.04 to 1.52 +/- 0.07 ml/min (P less than 0.005). A parallel increase in single nephron glomerular filtration rate, from 34 +/- 1 to 44 +/- 2 nl/min (P less than 0.001), and from 26 +/- 1 to 37 +/- 2 nl/min (P less than 0.005) was measured at the end-proximal and early distal nephron sites, respectively. Appropriate for the higher flows were an increase in absolute proximal and loop reabsorptive rates for bicarbonate, chloride, and water, with a slight decrease in fractional solute and volume reabsorption in proximal and loop segments. To exclude the possibility that atrial natriuretic factor increased filtration rate only in anesthetized animals, eight unanesthetized rats were studied. Glomerular filtration rate increased by 45%, from 2.04 +/- 0.17 to 2.97 +/- 0.27 ml/min (P less than 0.005) without significant change in renal plasma flow, as reflected by 14C-para-aminohippurate clearance (5.4 +/- 0.5-5.6 +/- 0.9 ml/min). The clearance and micropuncture data did not preclude changes in relative blood flow distribution to or in transport by deep nephron segments. In conclusion, atrial natriuretic factor appears to increase renal solute excretion predominantly by a hemodynamic mechanism without directly inhibiting superficial tubular transport.
Details
- Title: Subtitle
- Renal mechanism of action of rat atrial natriuretic factor
- Creators
- CHOU-LONG Huang - University of California, San FranciscoJohn Lewicki - University of California, San FranciscoLorin K Johnson - University of California, San FranciscoMartin G Cogan - University of California, San Francisco
- Resource Type
- Journal article
- Publication Details
- The Journal of clinical investigation, Vol.75(2), pp.769-773
- Publisher
- American Society for Clinical Investigation
- DOI
- 10.1172/JCI111759
- PMID
- 3156153
- PMCID
- PMC423577
- ISSN
- 0021-9738
- eISSN
- 1558-8238
- Language
- English
- Date published
- 1985
- Academic Unit
- Nephrology; Internal Medicine
- Record Identifier
- 9984359896102771
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