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Vulnerability of premyelinating oligodendrocytes to white-matter damage in neonatal brain injury
Xiao-Bo Liu1, Yan Shen, Jennifer M Plane
1Department of Biochemistry and Molecular Medicine, Institute for Pediatric Regenerative Medicine, School of Medicine, University of California at Davis, Sacramento, CA 95817, USA.
Insights
Premature birth complications like periventricular leukomalacia (PVL) damage white matter in infants. Early damage to axon-glia synapses precedes cell loss, highlighting a critical therapeutic target for preventing long-term neurological deficits.
Area of Science:
- Neuroscience
- Developmental Biology
- Public Health
Background:
- Premature birth presents a growing public health challenge with rising incidence.
- Periventricular leukomalacia (PVL) is a primary brain injury in premature infants, leading to cerebral palsy.
- PVL involves damage to white matter and oligodendroglia, crucial for brain development.
Purpose of the Study:
- To investigate the early pathological mechanisms of periventricular leukomalacia (PVL) in premature infants.
- To understand the role of axon-glia synapses in the pathogenesis of white matter injury.
- To identify potential therapeutic targets for preventing neurological deficits associated with PVL.
Main Methods:
- Utilized mouse models to study periventricular leukomalacia (PVL) in immature white matter.
- Examined the integrity of synapses between axons and developing oligodendrocytes.
- Investigated the roles of microglial activation and astrogliosis in white matter injury.
Main Results:
- Synapses between axons and developing oligodendrocytes are rapidly and severely damaged in immature white matter.
- Loss of axon-glia synapses occurs before significant cellular loss in the developing brain.
- Microglial activation and astrogliosis are key triggers of white matter injury.
Conclusions:
- Damage to axon-glia synapses is an early and critical event in the pathogenesis of PVL.
- Preserving white matter integrity, particularly axon-glia synapses, is essential for preventing neurological consequences.
- Targeting early synaptic damage may offer a novel therapeutic strategy for PVL.
Abstract:
Premature birth is a significant economic and public health burden, and its incidence is rising. Periventricular leukomalacia (PVL) is the predominant form of brain injury in premature infants and the leading cause of cerebral palsy. PVL is characterized by selective white-matter damage with prominent oligodendroglial injury. The maturation-dependent vulnerability of developing and premyelinating oligodendrocytes to excitotoxic, oxidative, and inflammatory forms of injury is a major factor in the pathogenesis of PVL. Recent studies using mouse models of PVL reveal that synapses between axons and developing oligodendrocytes are quickly and profoundly damaged in immature white matter. Axon-glia synapses are highly vulnerable to white-matter injury in the developing brain, and the loss of synapses between axons and premyelinating oligodendrocytes occurs before any cellular loss in the immature white matter. Microglial activation and astrogliosis play important roles in triggering white-matter injury. Impairment of white-matter development and function in the neonatal period contributes critically to functional and behavioral deficits. Preservation of the integrity of the white matter is likely key in the treatment of PVL and subsequent neurological consequences and disabilities.
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