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Fe2+ uptake by intestinal brush-border membrane vesicles from normal and hypoxic mice
Biochimica Et Biophysica Acta
|April 11, 1985
Summary
Iron (Fe2+) uptake in mouse intestines involves two processes. A rapid, high-affinity binding occurs, followed by a predominant, large-capacity transport mechanism that facilitates iron absorption.
Area of Science:
- Gastroenterology
- Cell Biology
- Biochemistry
Background:
- Intestinal absorption is crucial for maintaining iron homeostasis.
- Brush-border membranes play a key role in nutrient uptake, including iron.
Purpose of the Study:
- To characterize the mechanisms of Fe2+ uptake by mouse intestinal brush-border membrane vesicles.
- To differentiate between binding and transport components of Fe2+ uptake.
Main Methods:
- Isolation of mouse intestinal brush-border membrane vesicles.
- Measurement of Fe2+ uptake kinetics at varying substrate concentrations.
- Assessment of the effects of inhibitors and ionic strength on Fe2+ uptake.
Main Results:
- Two distinct Fe2+ uptake components were identified: high-affinity binding and a saturable, hyperbolic transport process.
- The predominant transport component was largely independent of the ascorbate:Fe2+ ratio but sensitive to Co2+, Mn2+, and high salt concentrations.
- Hypoxia did not significantly alter Fe2+ uptake in the prepared vesicles.
Conclusions:
- Mouse intestinal brush-border membranes exhibit a complex Fe2+ uptake system with both binding and transport functionalities.
- The primary Fe2+ uptake mechanism appears to be a carrier-mediated transport process.
- Further investigation is needed to elucidate the specific transporters involved.