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Updated: Oct 3, 2025
Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
Published on: October 28, 2022
Dynamic Changes in Brain Iron Metabolism in Neonatal Rats after Hypoxia-Ischemia
Ding-Wang Hu1, Geng Zhang1, Ling Lin2
1Laboratory of Clinical Applied Anatomy, Department of Human Anatomy, School of Basic Medical Sciences, Fujian Medical University, No.1 Xuefu North Road, Fuzhou, Fujian 350122, China; Key Laboratory of Brain Aging and Neurodegenerative Diseases of Fujian Province, Fuzhou 350122, China.
Insights
Hypoxia-ischemia (HI) in neonatal rats causes dynamic changes in brain iron metabolism, leading to iron deposition and lipid peroxidation. This altered iron metabolism may contribute to white matter injury (WMI) pathogenesis.
Area of Science:
- Neuroscience
- Biochemistry
- Neonatal Research
Background:
- Hypoxic-ischemic white matter injury (WMI) pathogenesis in premature infants remains unclear.
- Cerebral iron metabolism imbalance is a potential key factor in WMI.
Purpose of the Study:
- Investigate iron distribution, content, and malondialdehyde (MDA) levels in neonatal rat brain regions after hypoxia-ischemia (HI).
- Clarify the role of iron metabolism in the development of WMI.
Main Methods:
- Utilized a rat model of hypoxic-ischemic WMI.
- Assessed iron metabolism via iron staining and assay kits.
- Determined brain injury severity using MDA assays.
Main Results:
- Significant brain iron deposition observed within 28 days post-HI, peaking at 3 days.
- Increased iron content noted 1-7 days post-HI, particularly at 3 days.
- Elevated iron content in parietal cortex and corpus callosum by 14 days, with MDA trends mirroring iron changes.
Conclusions:
- Neonatal rat brain iron metabolism undergoes dynamic changes following HI.
- These alterations may induce lipid peroxidation, contributing to WMI pathogenesis.
Objectives:
The pathogenesis of hypoxic-ischemic white matter injury (WMI) in premature infants is still unclear, and the imbalance of cerebral iron metabolism may play an important role. Our study set out to investigate the changes in iron distribution, iron content and malondialdehyde (MDA) in disparate brain regions (parietal cortex, corpus callosum, hippocampus) within 84 days after hypoxia-ischemia (HI) in neonatal rats and to clarify the role of iron metabolism in WMI.
Materials And Methods:
We adopted a rat model of hypoxic-ischemic WMI. Alterations in iron metabolism were detected by iron staining and iron assay kits, and the degree of brain injury was determined by MDA assays.
Results:
Our results showed that different degrees of brain iron deposition occurred within 28 days after HI, and iron staining was the most obvious 3 days after HI. The iron content increased remarkably at 1-7 d after HI in the mixed tissues, especially at 3 d after HI. While the iron content in the parietal cortex and corpus callosum elevated obviously 14 days after HI. And the change trend of MDA was almost consistent with that of the iron content.
Conclusions:
Our findings revealed that brain iron metabolism changed dynamically in 3-day-old neonatal rats suffering from HI, which may cause lipid peroxidation damage to brain tissues. This process may be one of the pathogeneses of hypoxic-ischemic WMI.
