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New insights into salt-sensitive hypertension.

Agata Ziomber1, Kajetan Juszczak2, Piotr Thor2

  • 1Department of Pathophysiology, Jagiellonian University Medical College, Krakow, Poland. agata.ziomber@uj.edu.pl.

Folia Medica Cracoviensia
|May 24, 2014
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Summary

Salt sensitivity, linked to hypertension, may involve sodium (Na+) storage in the skin, not just kidney volume regulation. This skin Na+ accumulation causes osmotic stress, contributing to high blood pressure.

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Area of Science:

  • Cardiovascular Physiology
  • Renal Physiology
  • Dermatology

Background:

  • Salt sensitivity, the link between salt intake and blood pressure, varies individually.
  • Traditional models emphasize renal regulation and extracellular volume (ECV) expansion in blood pressure control.
  • Emerging evidence suggests non-volume-related mechanisms are crucial in salt-sensitive hypertension.

Purpose of the Study:

  • To investigate the role of non-renal mechanisms in salt-sensitive hypertension.
  • To explore the concept of osmotically inactive sodium (Na+) storage in tissues.
  • To understand the skin's role in Na+ accumulation and hypertension development.

Main Methods:

  • Analysis of existing data on salt sensitivity and blood pressure regulation.
  • Review of studies on sodium storage mechanisms beyond extracellular volume.
  • Examination of the proposed role of skin interstitial hypertonicity and associated molecular responses.

Main Results:

  • Salt-sensitive hypertension may not primarily result from ECV expansion.
  • Sodium (Na+) might be stored osmotically inactive in the skin or via Na+/K+ exchange in muscles.
  • Dietary salt loading increases skin Na+ storage, leading to interstitial hypertonicity and osmotic stress.

Conclusions:

  • Skin interstitial hypertonicity due to Na+ accumulation is a potential driver of salt-sensitive hypertension.
  • The skin's response includes lymph capillary hyperplasia and increased eNOS expression.
  • Reduced skin Na+ storage capacity or impaired Na+/K+ exchange may lead to volume retention and elevated blood pressure.