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Published on: May 12, 2015
Imaging selective vulnerability in the developing nervous system
Donna M Ferriero1, Steven P Miller
1Departments of Neurology and Pediatrics, Newborn Brain Research Institute, University of California-San Francisco, 521 Parnassus Avenue, San Francisco, CA 94143-0663, USA. donna.ferriero@ucsf.edu
Insights
Central nervous system (CNS) injury responses in newborns are age-dependent, with specific vulnerable regions and cell types. Understanding these evolving injury patterns and repair mechanisms is crucial for neurodevelopmental outcomes.
Area of Science:
- Neuroscience
- Developmental Biology
- Neuropathology
Background:
- Developing central nervous system (CNS) exhibits age-dependent vulnerability to stressors.
- Injury patterns are region-specific and cell-population specific, affecting vulnerable cells like subplate neurons and oligodendrocyte precursors.
- Mechanisms of injury include excitotoxicity, oxidative stress, inflammation, and apoptosis.
Purpose of the Study:
- To investigate age-dependent differences in CNS injury response.
- To understand the evolution of brain injury and repair processes in newborns.
- To correlate imaging findings with neurodevelopmental outcomes.
Main Methods:
- Utilized advanced imaging techniques, including magnetic resonance imaging (MRI), to observe injury patterns.
- Tracked the temporal evolution of brain injury over days and weeks post-insult.
- Investigated endogenous repair mechanisms such as neurogenesis and angiogenesis.
Main Results:
- Observed distinct patterns of injury based on age at insult and insult severity.
- Demonstrated that newborn brain injuries evolve over time, not just hours.
- Correlated early MRI findings with long-term neurodevelopmental outcomes.
- Identified neurogenesis and angiogenesis as potential repair mechanisms in response to ischemic injury.
Conclusions:
- CNS injury response in the developing brain is complex and dynamic.
- The age of the insult significantly influences the vulnerability and pattern of CNS damage.
- Brain repair processes, including neurogenesis and angiogenesis, play a role in attenuating injury and can be enhanced.
- Early detection and understanding of injury evolution are key to improving neurodevelopmental outcomes.
Abstract:
Why do cells in the central nervous system respond differently to different stressors and why is this response so age-dependent? In the immature brain, there are regions of selective vulnerability that are predictable and depend on the age when the insult occurs and the severity of the insult. This damage is both region and cell population specific. Vulnerable cell populations include the subplate neurons and oligodendrocyte precursors early in development and the neurons closer to the end of human gestation. Mechanisms of injury include excitotoxicity, oxidative stress and inflammation as well as accelerated apoptosis. Advanced imaging techniques have shown us particular patterns of injury according to age at insult. These changes seen in the newborn at the time of injury on magnetic resonance imaging correlate well with the neurodevelopmental outcome. New questions about how the injury evolves and how the newborn brain adapts and repairs itself have emerged as we now know that injury in the newborn brain can evolve over days and weeks, rather than hours. The ability to follow these processes has allowed us to investigate the role of repair in attenuating the injury. Neurogenesis and angiogenesis exist in response to ischemic injury and can be enhanced by processes that are known to protect the brain. The injury response in the developing brain is a complex process that evolves over time and is amenable to repair.
