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Updated: Jun 22, 2026
Assessing Iron Deposition in the Brains of 5xFAD Mice by Perls'/DAB Staining
Published on: May 23, 2025
Minocycline attenuates iron neurotoxicity in cortical cell cultures
Jing Chen-Roetling1, Lifen Chen, Raymond F Regan
1Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Abstract:
Iron neurotoxicity may contribute to the pathogenesis of intracerebral hemorrhage (ICH). The tetracycline derivative minocycline is protective in ICH models, due putatively to inhibition of microglial activation. Although minocycline also chelates iron, its effect on iron neurotoxicity has not been reported, and was examined in this study. Cortical cultures treated with 10 microM ferrous sulfate for 24h sustained loss of most neurons and an increase in malondialdehyde. Minocycline prevented this injury, with near-complete protection at 30 microM. Two other inhibitors of microglial activation, doxycycline and macrophage/microglia inhibitory factor, were ineffective. Oxidation of isolated culture membranes by iron was also inhibited by minocycline. Consistent with prior observations, minocycline chelated iron in a siderophore colorometric assay; at concentrations less than 100 microM, its activity exceeded that of deferoxamine. These results suggest that attenuation of iron neurotoxicity may contribute to the beneficial effect of minocycline in hemorrhagic stroke and other CNS injury models.
Insights
Minocycline protects neurons from iron toxicity, a key factor in brain hemorrhage. This study shows minocycline
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- Iron neurotoxicity is implicated in intracerebral hemorrhage (ICH) pathogenesis.
- Minocycline, a tetracycline derivative, shows protective effects in ICH models, potentially via microglial inhibition.
Purpose of the Study:
- To investigate the effect of minocycline on iron-induced neurotoxicity.
- To determine if minocycline's iron-chelating properties contribute to its neuroprotective effects.
Main Methods:
- Primary cortical cultures were exposed to ferrous sulfate to induce iron neurotoxicity.
- Minocycline's protective effects were assessed by measuring neuronal survival and malondialdehyde levels.
- Iron-chelating activity of minocycline was compared to deferoxamine.
Main Results:
- Ferrous sulfate caused significant neuronal loss and increased malondialdehyde.
- Minocycline demonstrated dose-dependent neuroprotection, with near-complete protection at 30 microM.
- Minocycline effectively inhibited iron-induced oxidation of isolated membranes and chelated iron, outperforming deferoxamine at lower concentrations.
Conclusions:
- Minocycline attenuates iron neurotoxicity, suggesting this mechanism contributes to its beneficial effects in ICH and other central nervous system injuries.
- The iron-chelating capacity of minocycline is a significant factor in its neuroprotective action.
