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Updated: May 24, 2026
The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
Published on: November 19, 2008
Molecular mechanisms of neonatal brain injury
Claire Thornton1, Catherine I Rousset, Anton Kichev
1Centre for the Developing Brain, Institute of Reproductive and Developmental Biology, Department of Surgery and Cancer, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK.
Insights
Fetal/neonatal brain injury causes long-term disability. Understanding delayed injury phases, like mitochondrial dysfunction, allows for new neuroprotective treatments days after the initial insult.
Area of Science:
- Neuroscience
- Pediatrics
- Pathophysiology
Background:
- Fetal/neonatal brain injury is a major cause of neurological disability.
- Hypoxia-ischemia and excitotoxicity are key insults leading to injury.
- Brain damage progresses over primary, secondary, and tertiary phases after the insult.
Purpose of the Study:
- To explore pathophysiological mechanisms during secondary and tertiary phases of brain injury.
- To identify potential therapeutic targets for neuroprotection beyond the acute phase.
- To review molecular events in secondary phase injury, including mitochondrial dysfunction and apoptosis.
Main Methods:
- Literature review of pathophysiological mechanisms in fetal/neonatal brain injury.
- Analysis of molecular events during the secondary phase of injury.
- Examination of recent evidence for delayed therapeutic interventions.
Main Results:
- Brain injury develops over a protracted period, with delayed progression.
- Mitochondrial dysfunction and apoptosis are critical in the secondary phase of injury.
- Interventions may be effective days to weeks after the initial insult.
Conclusions:
- Delayed injury progression offers a therapeutic window for neuroprotection.
- Targeting secondary phase mechanisms like mitochondrial dysfunction is crucial.
- Developing next-generation treatments requires understanding these later injury phases.
Abstract:
Fetal/neonatal brain injury is an important cause of neurological disability. Hypoxia-ischemia and excitotoxicity are considered important insults, and, in spite of their acute nature, brain injury develops over a protracted time period during the primary, secondary, and tertiary phases. The concept that most of the injury develops with a delay after the insult makes it possible to provide effective neuroprotective treatment after the insult. Indeed, hypothermia applied within 6 hours after birth in neonatal encephalopathy reduces neurological disability in clinical trials. In order to develop the next generation of treatment, we need to know more about the pathophysiological mechanism during the secondary and tertiary phases of injury. We review some of the critical molecular events related to mitochondrial dysfunction and apoptosis during the secondary phase and report some recent evidence that intervention may be feasible also days-weeks after the insult.
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