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Isolation of Murine Coronary Vascular Smooth Muscle Cells
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High salt-induced hypertrophy of human vascular smooth muscle cells associated with a decrease in glycocalyx.

Ghassan Bkaily1, Yanick Simon1, Istok Menkovic1

  • 1Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, Quebec J1H 5N4, Canada.

Journal of Molecular and Cellular Cardiology
|October 16, 2018
PubMed
Summary

High salt intake damages cell membranes, leading to vascular smooth muscle cell (hVSMC) hypertrophy and potentially increasing blood pressure. This study reveals how excess salt impacts hVSMCs, offering insights into salt-sensitive hypertension.

Keywords:
GlycocalyxHuman vascular smooth muscleHypertrophyIntracellular calciumIntracellular sodiumSalt-sensitive hypertension

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Area of Science:

  • Cardiovascular Research
  • Cell Biology
  • Hypertension Studies

Background:

  • Average daily salt consumption is nearly double the recommended amount, contributing to increased blood pressure and cardiovascular disease.
  • While general hypertension is well-studied, salt-sensitive hypertension and its mechanisms remain less understood.

Purpose of the Study:

  • To investigate the effects of acute and chronic high salt intake on human vascular smooth muscle cells (hVSMCs).
  • To test the hypothesis that high salt concentrations induce hVSMC hypertrophy and damage to the plasma membrane glycocalyx.

Main Methods:

  • Quantitative 3D confocal microscopy and immunofluorescence techniques were used.
  • hVSMCs were treated with normal (145 mM) or high (149 mM) extracellular sodium chloride for acute (2-4 days) and chronic (6-16 days) periods.

Main Results:

  • Acute high salt treatment reduced glycocalyx density but did not alter cell or nuclear volumes.
  • Chronic high salt treatment significantly decreased glycocalyx density, increased cell and nuclear volumes (hypertrophy), and elevated the protein/DNA ratio.
  • High salt-induced hVSMC hypertrophy was linked to sustained intracellular sodium (Na+) and calcium (Ca2+) overload.

Conclusions:

  • Even a small increase in salt concentration (4 mM) damages the cell membrane glycocalyx, causing chronic Na+ and Ca2+ overload and hVSMC hypertrophy.
  • This hypertrophy may narrow arteries, increasing blood pressure and contributing to salt-sensitive hypertension.
  • Further research into high salt-induced hVSMC remodeling could lead to new therapeutic strategies for hypertension and cardiovascular disease.