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Salt sensitivity and cell permeability.

S M Friedman1

  • 1Department of Anatomy, University of British Columbia, Vancouver, Canada.

Journal of Hypertension
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Changes in blood sodium concentration impact blood pressure by altering intracellular sodium levels. Increased cell permeability, induced by deoxycorticosterone acetate (DOCA)-saline treatment, amplifies these effects in rats.

Area of Science:

  • Physiology
  • Nephrology
  • Cell Biology

Background:

  • Blood pressure regulation is influenced by sodium balance.
  • Previous research linked blood pressure changes to intracellular sodium and transmembrane gradients.

Purpose of the Study:

  • To investigate if the blood pressure response to salt loading is dependent on the rate of intracellular sodium accumulation.
  • To examine the role of enhanced cell permeability in this process.

Main Methods:

  • Rats were treated with deoxycorticosterone acetate (DOCA)-saline for 3 days to increase cell permeability.
  • Intraperitoneal salt loads were administered, and blood pressure, extracellular, and intracellular sodium concentrations were measured.
  • Uninephrectomy was performed in some rats to assess the impact on salt excretion.

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Main Results:

  • DOCA-saline treated rats showed significantly increased cell sodium accumulation and a greater rise in blood pressure in response to salt loading.
  • Increased intracellular sodium concentration occurred without a proportional increase in water.
  • DOCA-induced permeability was not specific to sodium, affecting non-electrolytes as well.

Conclusions:

  • The rate of intracellular sodium accumulation is a key determinant of the blood pressure response to changes in extracellular sodium.
  • DOCA enhances cell permeability, likely involving the phospholipid matrix, leading to exaggerated sodium and blood pressure changes.
  • These findings provide insights into the mechanisms of sodium-induced hypertension.