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A method for studying plasma membrane transport with intact cells using computerized fluorometry

P R Wielinga1, M Heijn, H V Westerhoff

  • 1Department of Medical Oncology, Academisch Ziekenhuis Vrije Universiteit, Room BR232, Amsterdam, 1007 MB, the Netherlands.

Analytical Biochemistry
|November 4, 1998
PubMed
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This study introduces a novel method for measuring fluorescent compound efflux from cells, offering a simpler, non-radioactive alternative for studying active and passive transport kinetics.

Area of Science:

  • Cell biology
  • Biophysics
  • Pharmacology

Background:

  • Understanding cellular efflux mechanisms is crucial for drug delivery and toxicology.
  • Existing methods for measuring substrate efflux often involve radioisotopes or complex setups.

Purpose of the Study:

  • To present a new, simplified method for quantifying rapid fluorescent compound efflux from monolayer cells.
  • To validate the method by studying the kinetics of P-glycoprotein-mediated active and passive transport.

Main Methods:

  • Cells grown on coverslips were loaded with fluorescent substrates.
  • Coverslips were placed in a fluorometer cuvette to monitor extracellular fluorescence changes.
  • Kinetics of rhodamine 123 and daunorubicin transport were analyzed.

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Main Results:

  • The method allows continuous monitoring of extracellular substrate concentration, improving kinetic resolution.
  • It avoids the need for radioactively labeled substrates and is not affected by cell autofluorescence.
  • Cellular transport parameters, including passive permeation coefficients and active transport rates, were calculated.

Conclusions:

  • This novel fluorometric method provides a simple, sensitive, and efficient approach for studying cellular efflux.
  • It offers significant advantages over traditional methods for investigating active and passive membrane transport kinetics.