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Related Experiment Videos

Staining kinetics in single cells. Part II. Diffusion processes inside the cell.

C Winzek1, H Baumgärtel

  • 1Institut für Physikalische und Theoretische Chemie, Freie Universität Berlin, Germany.

Histochemistry
|January 1, 1988
PubMed
Summary
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This study investigated thionin dye uptake in cells and nuclei, finding that cell pretreatment and electrolyte concentration affect staining rates. A porous matrix model with adsorption explains the dye migration mechanism.

Area of Science:

  • Cell biology
  • Biophysics
  • Spectroscopy

Background:

  • Understanding dye uptake mechanisms is crucial for cell analysis.
  • Thionin is a vital stain used in cell research.
  • Previous studies have not fully elucidated the kinetics of thionin dye migration within cells.

Purpose of the Study:

  • To investigate the time-dependent uptake of thionin in lymphocytes and monkey kidney cells.
  • To determine the factors influencing the rate of thionin staining.
  • To elucidate the mechanism of dye migration within cells using a spectroscopic approach.

Main Methods:

  • Spectroscopic measurement of time-dependent thionin uptake in lymphocytes, monkey kidney cells, and their nuclei.
  • Utilizing fixed cell material to eliminate plasma membrane and cytoplasm hindrance.

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  • Applying hydrodynamic conditions to minimize convective diffusion effects.

    • Main Results:

    • Staining rate is dependent on thionin dye concentration, cell pretreatment, and electrolyte concentration.
    • Dye migration within cells follows a porous matrix model.
    • A dynamic, reversible equilibrium between migrating dye and pore wall binding sites, described by the Freundlich adsorption isotherm, was observed.

    Conclusions:

    • The proposed porous matrix model accurately explains the observed staining kinetics of thionin in cells.
    • Cellular pretreatment and solution electrolyte concentration are key modulators of thionin uptake.
    • Adsorption phenomena significantly influence dye diffusion within the cellular matrix.