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Iron involvement in neural damage and microgliosis in models of neurodegenerative diseases
1Research Department, Herzog Hospital, Jerusalem, Israel. sshoham@md2.huji.ac.il
Abstract:
In several neurodegenerative diseases, iron accumulates at sites of brain pathology. Since post-mortem examination cannot distinguish whether iron accumulation caused the damage or resulted from damage, it is necessary to manipulate iron in animal and tissue culture models to assess its causal role(s). However, only in models of Parkinson's disease and of global ischemia, iron deprivation (ID) or iron-chelators have been used to protect from damage. In these studies, documentation of microgliosis was not performed even though several lines of evidence converge to suggest that activation of microglia is an important source of oxidative stress. In the kainate model of epilepsy, we found that ID protected the olfactory cortex, thalamus and hippocampus and attenuated microgliosis, whereas iron supplementation to ID rats increased damage and microgliosis in the above regions. In the hilus of the hippocampal dentate gyrus, even though no cell loss was observed, ID attenuated microgliosis and iron-supplementation increased it. Thus there is a tight relationship between iron and microgliosis. In addition, iron+zinc supplementation dramatically increased damage to hippocampal CA1 whereas zinc supplementation alone had no effect. This study demonstrates an anatomically unique interaction of iron and zinc, which may lead to new insights to neurodegeneration in epilepsy.
Insights
Iron deprivation protects against epilepsy-related brain damage and reduces microgliosis. Iron supplementation exacerbates damage and microgliosis, highlighting a critical link between iron and neuroinflammation in epilepsy.
Area of Science:
- Neuroscience
- Neurobiology
- Pathology
Background:
- Iron accumulation is observed in various neurodegenerative diseases, but its causal role remains unclear.
- Previous studies on iron's role in neurodegeneration primarily focused on Parkinson's disease and global ischemia.
- Microgliosis, a marker of neuroinflammation, is implicated in oxidative stress but its relationship with iron in epilepsy is understudied.
Purpose of the Study:
- To investigate the causal role of iron in epilepsy-induced brain damage and microgliosis.
- To explore the interaction between iron, zinc, and neuroinflammation in an epilepsy model.
Main Methods:
- Utilized the kainate model of epilepsy in rats.
- Administered iron deprivation (ID) and iron supplementation to assess effects on brain damage and microgliosis.
- Examined the impact of combined iron and zinc supplementation.
Main Results:
- Iron deprivation (ID) protected olfactory cortex, thalamus, and hippocampus from kainate-induced damage and attenuated microgliosis.
- Iron supplementation in ID rats increased damage and microgliosis in these brain regions.
- ID attenuated microgliosis in the hippocampal dentate gyrus hilus, while iron supplementation increased it.
- Combined iron and zinc supplementation significantly increased damage to hippocampal CA1, whereas zinc alone had no effect.
Conclusions:
- Establishes a strong correlation between iron levels and microgliosis in the context of epilepsy.
- Demonstrates that iron plays a causal role in exacerbating epilepsy-related neurodegeneration and neuroinflammation.
- Reveals a unique anatomical interaction between iron and zinc, suggesting novel therapeutic targets for epilepsy.
