Related Experiment Videos
Sodium fluorescein accumulation in cultured cells
O V Braginskaja1, V V Lazarev, I N Pershina
1Institute for Nuclear Physics, Moscow State University, Russia.
General Physiology and Biophysics
|October 1, 1993
Summary
This study reveals that fluorescein accumulation in cells is driven by pH gradients, not malignancy. This finding explains its increased presence in gastric cancer tissues compared to normal ones.
Area of Science:
- Cell Biology
- Biochemistry
- Oncology
Background:
- Intracellular accumulation of fluorescein is observed in various cell types.
- Understanding the mechanism of fluorescein uptake is crucial for its diagnostic applications, particularly in cancer research.
Purpose of the Study:
- To investigate the mechanism of intracellular fluorescein accumulation.
- To determine if fluorescein accumulation is linked to cellular malignancy.
- To elucidate the role of pH gradients in fluorescein uptake.
Main Methods:
- Studied fluorescein accumulation kinetics in K562 human erythroleukemia cells and primary human embryonic skin fibroblasts.
- Manipulated extracellular pH, ion composition, and temperature.
- Analyzed fluorescein binding to intracellular macromolecules.
Main Results:
- Fluorescein accumulation kinetics support a theoretical model based on pH gradients.
- Fluorescein molecules bind to intracellular macromolecules.
- Accumulation is independent of the malignant nature of the cells studied.
Conclusions:
- Fluorescein accumulation in cells is primarily governed by the intracellular-extracellular pH gradient.
- The greater pH gradient in tumor tissues, like gastric cancer, leads to higher fluorescein accumulation.
- This mechanism explains observed fluorescein levels in clinical cancer investigations.