Related Experiment Videos
Cerebral white matter damage in the preterm infant: pathophysiology and risk factors
1INSERM U 316, Department of Neonatology, Centre Hospitalier Universitaire, Tours, France. saliba@med.univ-tours.fr
Insights
White matter damage in preterm infants, like periventricular leukomalacia (PVL), stems from various factors including intrauterine infection. Research explores causes and an animal model for potential prevention strategies.
Area of Science:
- Neuroscience
- Neonatology
- Developmental Biology
Background:
- White matter damage, particularly periventricular leukomalacia (PVL), is a significant concern in preterm infants.
- Its etiology is multifactorial, involving genetic, hypoxic-ischemic, infectious, inflammatory, oxidative stress, excitotoxicity, and trophic factor deficiency pathways.
Purpose of the Study:
- To summarize research findings on the etiology of white matter damage and cerebral palsy in preterm infants.
- To present epidemiological and neurobiological data on specific antecedents.
- To discuss the role of fetal inflammatory response and introduce a novel animal model.
Main Methods:
- Review of clinical, epidemiological, and experimental studies.
- Analysis of prenatal and perinatal factors contributing to neonatal brain injury.
- Establishment of an animal model using intra-cortical ibotenate injections in developing mouse brains.
Main Results:
- Intrauterine infection is identified as a key prenatal factor contributing to fetal inflammatory response and subsequent neonatal brain injury.
- The animal model successfully induced white matter cysts via excitotoxic lesions on postnatal day 5.
- The model provides a platform for further investigation into PVL mechanisms.
Conclusions:
- The etiology of white matter damage in preterm infants is complex, with intrauterine infection playing a critical role.
- The developed animal model offers a valuable tool for studying PVL pathogenesis.
- Further research using this model may lead to the development of preventive strategies.
Abstract:
Based on clinical, epidemiologic, and experimental studies, the aetiology of white matter damage, specifically periventricular leukomalacia (PVL), is multifactorial and involves pre- and perinatal factors possibly including genetic factors, hypoxic-ischaemic insults, infection, excess cytokines, free radical production, increased excitatory amino acid release, and trophic factor deficiencies. The article summarizes research findings about the aetiology of white matter damage and cerebral palsy in preterm infants. The information is organized according to specific antecedents, for which we present epidemiological and neurobiological data. The most important prenatal factor appears to be intrauterine infection. We discuss the evidence supporting the hypothesis that the foetal inflammatory response contributes to neonatal brain injury and later developmental disability. We recently established an animal model of excitotoxic lesions in the developing mouse brain. Brain damage was induced by intra-cortical injections of ibotenate, a glutamatergic agonist. When administered on post-natal day 5 ibotenate induced the formation of white matter cysts. Our animal model could be used to further explore the mechanisms involved in the formation of PVL. Potentially preventive strategies will be discussed.