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Extracellular iron chelators protect kidney cells from hypoxia/reoxygenation
1Department of Medicine, University of Minnesota, Minneapolis 55409-0392.
Free Radical Biology & Medicine
|December 1, 1994
Summary
Extracellular iron contributes to cell injury during reoxygenation. Iron chelators restricted to the extracellular space effectively protected cells from hypoxia/reoxygenation damage, highlighting a potential therapeutic strategy.
Area of Science:
- Cellular Biology
- Biochemistry
- Renal Physiology
Background:
- Iron overload exacerbates reoxygenation injury by promoting hydroxyl radical formation.
- Previous in vivo studies showed glomerular-filtered iron chelators protect against postischemic renal injury.
Purpose of the Study:
- To investigate the protective effects of extracellular iron chelators against hypoxia/reoxygenation (H/R) injury in vitro.
- To determine the cellular localization and site of action of iron chelators during H/R.
Main Methods:
- Primary rat proximal tubular epithelial cells were subjected to 60 min hypoxia and 30 min reoxygenation.
- Cells were pretreated with deferoxamine (DFO) or hydroxyethyl starch-conjugated deferoxamine (HES-DFO).
- Iron distribution was quantified using 59Fe tracer studies.
Main Results:
- Hypoxia/reoxygenation increased intracellular and extracellular iron levels.
- Both DFO and HES-DFO significantly protected cells from lethal injury.
- HES-DFO remained extracellular, while minimal DFO entered cells.
Conclusions:
- Iron released during H/R contributes to cell injury.
- Extracellular iron chelation is a viable strategy for mitigating H/R-induced renal injury.
- Targeting extracellular iron offers a promising therapeutic approach for organ protection.