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Related Experiment Videos

pH regulation in spread cells and round cells.

M A Schwartz1, E J Cragoe, C P Lechene

  • 1Department of Cellular and Molecular Physiology, Harvard Medical School, Boston, Massachusetts 02115.

The Journal of Biological Chemistry
|January 25, 1990
PubMed
Summary

Cell adhesion influences intracellular pH (pHi) regulation. Spread cells exhibit higher pHi due to enhanced sodium-hydrogen (Na+/H+) exchange and bicarbonate-dependent mechanisms, unlike round cells.

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Area of Science:

  • Cell Biology
  • Physiology
  • Biochemistry

Background:

  • Intracellular pH (pHi) is critical for cellular function.
  • Cell adhesion to surfaces can alter cellular behavior and physiology.
  • Understanding pHi regulation is key to cell signaling and disease research.

Purpose of the Study:

  • To investigate how cell spreading on tissue culture plastic affects intracellular pH regulation compared to non-adherent cells.
  • To elucidate the roles of sodium-bicarbonate (Na+/H+ and HCO3-/Cl-) exchange in mediating these pHi differences.
  • To identify specific pH regulatory mechanisms altered by cell morphology.

Main Methods:

  • Utilized 3T3 cells cultured on adhesive plastic versus non-adhesive surfaces.
  • Manipulated extracellular sodium and bicarbonate concentrations.
  • Employed ethylisopropyl amiloride to inhibit Na+/H+ exchange.
  • Assessed pHi recovery rates following acute acid or alkaline challenges.

Main Results:

  • Spread cells showed higher steady-state pHi than round cells, independent of bicarbonate.
  • Sodium-hydrogen (Na+/H+) exchange was enhanced in spread cells, contributing to higher pHi.
  • Bicarbonate-dependent pH regulatory mechanisms (HCO3-/Cl- exchangers) were also stimulated in spread cells.
  • Round cells exhibited inhibited bicarbonate-dependent pH regulation.

Conclusions:

  • Sodium-hydrogen (Na+/H+) exchange plays a primary role in determining steady-state pHi in 3T3 cells.
  • Cell spreading enhances both Na+/H+ exchange and bicarbonate-dependent pH regulatory pathways.
  • Morphological changes associated with cell rounding inhibit key pH regulatory mechanisms.

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