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Iron supplementation aggravates periventricular cystic white matter lesions in newborn mice
M A Dommergues1, J Gallego, P Evrard
1Laboratoire de Neurologie et de Physiologie du Développement (INSERM CRI 97-01), Paris, France.
Insights
Iron may worsen brain damage in premature infants. This study found iron aggravated white matter lesions in a mouse model, suggesting caution with iron supplementation in premature newborns.
Area of Science:
- Neonatal neurology
- Neuroscience
- Developmental biology
Background:
- Periventricular leukomalacia (PVL) is a leading cause of neurological deficits in premature infants.
- Its exact cause is unknown, but excitotoxicity and free radicals are implicated.
- Oxygen and iron, common in neonatal care, can increase free radicals.
Purpose of the Study:
- To investigate if iron or oxygen exacerbates excitotoxic brain lesions in a neonatal mouse model.
- To understand the role of iron and oxygen in the pathogenesis of PVL.
Main Methods:
- Utilized a previously established mouse model of excitotoxic neonatal white matter lesions.
- Administered iron pretreatment or exposed mice to 100% oxygen.
- Assessed the severity of white matter lesions.
Main Results:
- Iron pretreatment significantly worsened white matter lesions in the mouse model.
- Exposure to 100% oxygen did not significantly increase lesion severity.
- Results suggest iron, not hyperoxia, aggravates excitotoxic brain injury.
Conclusions:
- High doses of iron may worsen periventricular leukomalacia in premature infants.
- Findings indicate a potential risk associated with iron supplementation in vulnerable newborns.
- Further research is needed to clarify iron's role in PVL pathogenesis.
Abstract:
Periventricular leukomalacia (PVL) is the main cause of neurological impairment in premature newborns. The pathogenesis of PVL remains unclear but may involve glutamate excitotoxicity and free radical production. Oxygen and iron, which are widely used in premature newborns, are oxidizing agents with a potential for promoting free radical production. We previously described a mouse model of excitotoxic neonatal white matter lesions mimicking several aspects of human PVL. In the present study, we used this mouse model to investigate whether iron pretreatment or 100% oxygen exposure worsened excitotoxic lesions. We found that iron pretreatment but not hyperoxia significantly increased white matter lesions, suggesting that high doses of iron may aggravate PVL in premature newborns.