Related Experiment Video
Updated: Aug 17, 2026
A Ferret Model of Inflammation-sensitized Late Preterm Hypoxic-ischemic Brain Injury
Published on: November 19, 2019
Selective vulnerability of preterm white matter to oxidative damage defined by F2-isoprostanes
Stephen A Back1, Ning Ling Luo, Rebecca A Mallinson
1Department of Pediatrics, Oregon Health and Science University, Portland OR 97239-3098, USA. backs@ohsu.edu
Insights
Periventricular white matter injury (PWMI) in preterm infants stems from oxidative damage targeting oligodendrocyte progenitors. This selective lipid peroxidation causes cerebral white matter injury and neurological disability.
Area of Science:
- Neuroscience
- Developmental Biology
- Pathology
Background:
- Periventricular white matter injury (PWMI) is a primary cause of cerebral palsy in premature infants.
- The exact mechanisms driving PWMI remain incompletely understood.
- Understanding PWMI pathogenesis is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the pathogenetic mechanisms underlying early periventricular white matter injury (PWMI).
- To identify the specific cellular targets and molecular pathways involved in PWMI.
- To elucidate the reasons for the vulnerability of preterm infants to PWMI.
Main Methods:
- Analysis of 33 human autopsy brains with varying degrees of PWMI.
- Measurement of F(2)-isoprostanes and F(4)-neuroprostanes as markers of oxidative damage.
- Assessment of oligodendrocyte progenitor cell depletion using TUNEL assay and cell counting.
- Immunohistochemical staining for 3-nitrotyrosine to detect protein nitration.
Main Results:
- Early PWMI lesions showed significantly increased F(2)-isoprostanes, indicating lipid peroxidation.
- Oligodendrocyte progenitor cells were selectively targeted and depleted by 71% +/- 8% in PWMI lesions.
- Neuronal and glial cells, as well as neuroaxonal elements, demonstrated resistance to oxidative damage.
- Protein nitration was not significantly detected in PWMI lesions.
Conclusions:
- PWMI in preterm infants is primarily caused by selective lipid peroxidation-mediated injury to cerebral white matter.
- The oligodendrocyte lineage is particularly vulnerable to this oxidative damage.
- Targeted death of oligodendrocyte progenitors contributes significantly to the neurological deficits observed in survivors of prematurity.
Abstract:
Periventricular white matter injury (PWMI) is the leading cause of cerebral palsy and chronic neurological disability in survivors of prematurity. Despite the large number of affected children, the pathogenetic mechanisms related to PWMI remain controversial. Through studies of 33 human autopsy brains, we determined that early PWMI was related to oxidative damage that particularly targeted the oligodendrocyte lineage, whereas other neuronal and glial cell types were markedly more resistant. F(2)-isoprostanes, an arachidinate metabolite/lipid peroxidation marker of oxidative damage, were significantly increased in early PWMI lesions but not in cerebral cortex. That deleterious lipid peroxidation accompanied early PWMI was supported by similar increases in F(2)-isoprostanes levels in the cerebral cortex from term infants with hypoxic-ischemic cortical injury. Detection of F(4)-neuroprostanes, a neuronal-specific oxidative damage marker, confirmed that neuroaxonal elements were resistant to injury in cerebral cortex and white matter. Significant protein nitration was not detected in PWMI lesions by 3-nitrotyrosine staining. Significant cellular degeneration was confirmed in early PWMI lesions by terminal deoxynucleotidyltransferase-mediated dUTP nick end labeling and a marked depletion of oligodendrocyte progenitors of 71 +/- 8%. Hence, the predilection of preterm infants for PWMI is related to selective lipid peroxidation-mediated injury of cerebral white matter and targeted death of oligodendrocyte progenitors.
