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Updated: May 12, 2026
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The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
Published on: November 19, 2008
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Impaired glymphatic transport in hypoxic-ischemic encephalopathy
Jieyi Shen1, Ying Yang2, Fangfang Chen2
1Department of Radiology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China; Core Facility Center, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, 230001, China.
Neuroimage
|August 6, 2025
Summary
Hypoxic-ischemic encephalopathy (HIE) impairs the brain's waste clearance system, known as the glymphatic system. This study reveals HIE causes persistent glymphatic dysfunction and affects brain development in neonatal mice.
Area of Science:
- Neuroscience
- Medical Imaging
- Developmental Biology
Background:
- Hypoxic-ischemic encephalopathy (HIE) is a significant cause of neonatal brain injury.
- The glymphatic system is vital for brain waste clearance and function.
- Previous research links HIE to stroke and TBI, but its effect on the glymphatic system is understudied.
Purpose of the Study:
- To investigate the impact of HIE on glymphatic system function and development in a neonatal mouse model.
- To assess regional glymphatic transport dysfunction using multimodal imaging techniques.
- To explore the role of Aquaporin-4 (AQP4) in HIE-induced glymphatic impairment.
Main Methods:
- Utilized a hypoxic-ischemic encephalopathy (HIE) mouse model.
- Employed dynamic contrast-enhanced MRI (DCE-MRI) for qualitative and quantitative assessment of glymphatic transport.
- Administered fluorescent cerebrospinal fluid (CSF) tracers to evaluate glymphatic system development.
- Conducted Aquaporin-4 (AQP4) immunohistochemical staining on brain sections.
Main Results:
- HIE mice showed delayed glymphatic transport dynamics and increased tracer retention in specific brain regions.
- Quantitative analysis revealed reduced CSF-to-perivascular and perivascular-to-parenchyma transfer constants (Kf, Ks) and increased perivascular volume fractions (Vf).
- HIE impaired glymphatic system maturation in neonatal mice, leading to persistent dysfunction and AQP4 mis-polarization.
Conclusions:
- HIE causes regional glymphatic transport dysfunction in the developing brain.
- Impaired glymphatic function in HIE is linked to astrocytic AQP4 mis-polarization.
- This study highlights the adverse effects of HIE on glymphatic system integrity and brain development.
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