Cited by 177Blood Pressure and Hypertension StudiesRenin-Angiotensin System StudiesRenal and Vascular Pathologies

Characterization of a new model for the study of pressure-natriuresis in the rat

Roman, R. J., Cowley, A. W.·1985·American Journal of Physiology-Renal Physiology

Abstract

The acute relationships between the urinary excretion of sodium and water and renal perfusion pressure were characterized in the rat using a new in vivo model of pressure diuresis. Neural and hormonal influences on the kidney were held constant by denervating the kidney and by maintaining fixed high plasma levels of vasopressin, aldosterone, corticosterone, and norepinephrine levels by intravenous infusion. Renal perfusion pressure (RPP) was varied above and below control using specially designed aortic clamps. Increasing RPP within the autoregulatory range from 90 to 160 mmHg produced 5- to 20-fold increases in urine flow and sodium excretion with no detectable changes in glomerular filtration rate, renal blood flow, or peritubular capillary pressure. The slope of the line relating urine flow and RPP averaged 2 microliter X min-1 X kidney-1 X mmHg-1 rise in RPP. If RPP was first lowered to 90 mmHg, urine flow could be doubled by increasing RPP by as little as 5 mmHg. Uninephrectomy 7-12 days before an experiment did not alter the renal pressure diuresis relationship. The presence of intact renal nerves, however, was found to shift the relationship between urine flow and RPP to the right. The magnitude of the response produced by elevations in pressure using this new model of pressure diuresis was greater than when RPP was increased using carotid occlusion or epinephrine infusion as in previous studies. The results indicate that small changes in arterial pressure may have a greater influence on sodium and water excretion than has been previously recognized.

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Crossref · 10.1152/ajprenal.1985.248.2.f190

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  • Renal parenchymal nociceptive sensory nerves respond to a renal injury signal by projecting to the hypothalamus to increase central sympathetic outflow.

    “The first, of the renal parenchyma and bearing nociceptive receptors, respond to a renal injury signal by projecting to the hypothalamus to increase central sympathetic outflow95–99.”
  • Renal sympathetic denervation shifts the renal pressure-natriuresis curve to the left, promoting urinary sodium excretion and lowering blood pressure.

    “Renal sympathetic denervation shifts the renal pressure-natriuresis curve to the left, promoting urinary sodium excretion and lowering of blood pressure94–98.”

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Authors
Roman, R. J., & Cowley, A. W.
Venue
American Journal of Physiology-Renal Physiology
Published
1985-02-01
Volume
248
Issue
2
Pages
F190-F198
ISSN
  • 1522-1466 (ISSN-L)
  • 1931-857X
OpenAlex
W1798432044
Cited by
176
References
0
Citations by year
2024: 2 · 2023: 3 · 2022: 2 · 2021: 6 · 2020: 5 · 2019: 1 · 2017: 3 · 2016: 2 · 2015: 13 · 2014: 10 · 2013: 5 · 2012: 2
FWCI
4.19
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Renal Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL-29587-01, R37HL036279)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Renal and Vascular Pathologies
Keywords
pressure natriuresis, pressure diuresis, renal perfusion pressure, sodium excretion, water excretion, renal autoregulation, renal denervation, renal nerves, unilateral nephrectomy, urine flow, renal blood flow, glomerular filtration rate, vasopressin, aldosterone, corticosterone, norepinephrine
MeSH terms
Animals, Blood Pressure, Capillaries, Diuresis, Glomerular Filtration Rate, Homeostasis, Hormones, Kidney, Male, Natriuresis, Nephrectomy, Perfusion, Physiology, Rats, Inbred Strains, Rats

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