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HepG2 cells undergo regulatory volume decrease by mechanically induced efflux of water and solutes.

Dominic J Olver1, Iqra Azam1, James D Benson2

  • 1Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK, S7N 5E2, Canada.

Biomechanics and Modeling in Mechanobiology
|July 16, 2024
PubMed
Summary
This summary is machine-generated.

Animal cell membranes maintain a hydrostatic gradient under anisotonic conditions, challenging prior beliefs. A turgor-leak model best explains cell volume regulation, surpassing the Boyle van't Hoff relation.

Keywords:
Boyle van’t Hoff relationCellular mechanicsMechano-osmoticsMechanosensitive channelsPump and leakVolume regulation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Physiology

Background:

  • Conventional understanding suggests animal cell membranes lack significant hydrostatic gradients, especially under anisotonic stress.
  • The Boyle van't Hoff relation is a standard model for cell volume equilibration but omits key cellular components.
  • Components like the cytoskeleton, actin cortex, mechanosensitive channels, and ion pumps influence cell volume dynamics.

Purpose of the Study:

  • To investigate the hydrostatic gradient in animal cell membranes under anisotonic conditions using the HepG2 cell line.
  • To develop and test alternative models for cell volume regulation that incorporate mechanical resistance, solute leakage, and ion pumping.
  • To determine the most accurate model for describing hypotonic and hypertonic volume equilibration and regulatory volume decrease.

Main Methods:

  • Utilized the human hepatoma cell line HepG2 for experiments.
  • Applied anisotonic solutions to induce volume changes and observed cellular responses.
  • Compared the predictive power of the Boyle van't Hoff relation against alternative models, including the turgor-leak model.

Main Results:

  • The Boyle van't Hoff relation accurately described hypertonic volume equilibration but failed for hypotonic conditions.
  • Cells exhibited smaller volumes than initial isotonic levels after anisotonic exposure and return to isotonicity, indicating solute leakage.
  • Regulatory volume decrease occurred at both 20°C and 4°C, suggesting it is a passive process not solely driven by ion pumps.

Conclusions:

  • The Boyle van't Hoff relation is insufficient for fully explaining cell volume regulation under hypotonic stress.
  • Solute leakage during swelling and mechanical resistance are critical factors in cell volume dynamics.
  • The turgor-leak model, incorporating mechanical resistance and solute leakage, provides the best fit for observed HepG2 cell behavior, challenging conventional hydrostatic gradient assumptions.