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Bathophenanthrolene disulfonic acid and sodium dithionite effectively remove surface-bound iron from Caco-2 cell
R P Glahn1, M B Gangloff, D R Van Campen
1U.S. Plant, Soil and Nutrition Laboratory, USDA/ARS, Cornell University, Ithaca, NY 14853, USA.
The Journal of Nutrition
|July 1, 1995
Summary
Accurately measure iron uptake in Caco-2 cells with a new method. This technique effectively removes surface-bound iron, ensuring precise quantification of intracellular iron transport and improving the reliability of cell culture studies.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Iron uptake studies in Caco-2 cell monolayers typically involve radiolabeled iron.
- Distinguishing surface-bound iron from intracellular iron is crucial for accurate uptake measurements.
- Existing methods may not effectively differentiate between these two forms of iron.
Purpose of the Study:
- To develop and validate a method for removing surface-bound iron from Caco-2 cell monolayers.
- To improve the accuracy of intracellular iron uptake measurements in cell culture models.
- To provide a reliable tool for researchers studying intestinal iron absorption.
Main Methods:
- A novel solution containing sodium dithionite and bathophenanthroline disulfonic acid was used to reduce, remove, and chelate surface-bound iron.
- The solution's efficacy was validated by measuring the removal of an insoluble iron complex from the apical surface.
- The method's impact on cell membrane integrity and intracellular access was assessed.
Main Results:
- The developed method successfully removed 97% of an insoluble iron complex from the apical surface of Caco-2 cells.
- The removal solution did not damage the apical membrane or access intracellular iron.
- Iron uptake measurements using this method aligned better with established principles of intestinal iron transport.
Conclusions:
- A validated method for removing surface-bound iron from Caco-2 cells has been established.
- This technique accurately quantifies intracellular iron, enhancing the reliability of cell-based iron uptake studies.
- The method offers a valuable tool for researchers investigating epithelial iron transport mechanisms.