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QCM sensor provides insight into the role of pivotal ions in cellular regulatory volume decrease.

Peihui Yang1, Shan Bao2, Suting Xiao2

  • 1Department of Chemistry, College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, People's Republic of China. typh@jnu.edu.cn.

Analytical and Bioanalytical Chemistry
|November 18, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel quartz crystal microbalance (QCM) method to measure how key ions affect cellular regulatory volume decrease (RVD). The findings reveal that potassium, chloride, and calcium ions significantly influence RVD, offering new insights into cell volume regulation.

Keywords:
Cellular behaviorPivotal ionsQuartz crystal microbalance sensorRegulatory volume decrease

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomedical Engineering

Background:

  • Vertebrate cells maintain homeostasis through self-regulation, with regulatory volume decrease (RVD) being a critical mechanism.
  • Ions such as potassium (K+), chloride (Cl-), and calcium (Ca2+) are pivotal in RVD, but their precise roles under repeated stimulation require further elucidation.
  • Existing methods for assessing ion effects on RVD are limited, hindering a comprehensive understanding of cell volume regulation.

Purpose of the Study:

  • To develop and validate an effective measurement process for assessing the impact of pivotal ions on RVD.
  • To reveal acute variations in cell volume regulation induced by K+, Cl-, and Ca2+ using a novel biosensing approach.
  • To provide a comprehensive assessment of cellular behavior and gain insight into the mechanisms of RVD.

Main Methods:

  • Implementation of a quartz crystal microbalance (QCM) sensor by immobilizing MCF-7 cells on a modified gold chip.
  • Cyclic stimulation of cells with hypotonic NaCl medium to induce and measure RVD via frequency shifts (Δf).
  • Assessment of ion-specific effects by introducing NaCl-KCl and NaCl-CaCl2 solutions, and by inhibiting chloride channels.

Main Results:

  • Progressive decrease in RVD values observed with repeated hypotonic stimulation cycles (60.7% and 82.1% decline in 2nd and 3rd cycles).
  • RVD recovered with K+ supplementation and was significantly enhanced by Ca2+ (52.2% increase).
  • Inhibition of chloride channels reduced RVD by 56.2%, indicating the critical role of Cl- efflux.

Conclusions:

  • K+, Cl-, and Ca2+ ions significantly modulate RVD function in vertebrate cells.
  • Intracellular Cl- depletion impairs RVD, while K+ restores it, and Ca2+ enhances it via ion channel activation.
  • The QCM-based method offers an innovative and effective strategy for analyzing ion roles in cell volume regulation.