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Updated: Jun 24, 2025
The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
Published on: November 19, 2008
Regulated cell death in hypoxic-ischaemic encephalopathy: recent development and mechanistic overview
Lingzhi Wu1, Enqiang Chang1, Hailin Zhao1
1Division of Anaesthetics, Pain Medicine and Intensive Care, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, Chelsea and Westminster Hospital, London, UK.
Insights
Hypoxic-ischaemic encephalopathy (HIE) involves diverse cell death pathways beyond apoptosis. Understanding regulated cell death (RCD) crosstalk, particularly at mitochondrial hubs, offers new therapeutic targets for infant brain injury.
Area of Science:
- Neuroscience
- Neonatal Medicine
- Cell Biology
Background:
- Hypoxic-ischaemic encephalopathy (HIE) is a major cause of infant mortality and morbidity globally.
- Existing treatments like therapeutic hypothermia are insufficient due to heterogeneous cell death mechanisms in the immature brain.
- Cell death in HIE involves apoptosis, necroptosis, pyroptosis, and ferroptosis, alongside protective autophagy and mitophagy.
Purpose of the Study:
- To explore the diverse and interconnected regulated cell death (RCD) pathways in HIE.
- To investigate the role of molecular crosstalk between different RCD subtypes.
- To identify potential therapeutic targets for HIE by understanding RCD mechanisms.
Main Methods:
- Review of emerging evidence on RCD pathways in HIE.
- Analysis of molecular crosstalk between apoptosis, necroptosis, pyroptosis, ferroptosis, autophagy, and mitophagy.
- Identification of mitochondria as a central signaling hub for RCD pathways.
Main Results:
- HIE involves a spectrum of cell death, including pathological activation of necroptosis, pyroptosis, and ferroptosis.
- Autophagy and mitophagy are upregulated as intrinsic neuroprotective responses.
- Mitochondria act as a convergence point for various RCD pathways, suggesting molecular crosstalk.
Conclusions:
- The complex interplay of RCD pathways in HIE presents significant challenges but also therapeutic opportunities.
- Targeting the mitochondrial signaling hub could enable simultaneous and synergistic inhibition of cell death.
- Further understanding of RCD mechanisms and their crosstalk is crucial for developing novel HIE therapies.
Abstract:
Hypoxic-ischaemic encephalopathy (HIE) in termed infants remains a significant cause of morbidity and mortality worldwide despite the introduction of therapeutic hypothermia. Depending on the cell type, cellular context, metabolic predisposition and insult severity, cell death in the injured immature brain can be highly heterogenous. A continuum of cell death exists in the H/I-injured immature brain. Aside from apoptosis, emerging evidence supports the pathological activation of necroptosis, pyroptosis and ferroptosis as alternative regulated cell death (RCD) in HIE to trigger neuroinflammation and metabolic disturbances in addition to cell loss. Upregulation of autophagy and mitophagy in HIE represents an intrinsic neuroprotective strategy. Molecular crosstalk between RCD pathways implies one RCD mechanism may compensate for the loss of function of another. Moreover, mitochondrion was identified as the signalling "hub" where different RCD pathways converge. The highly-orchestrated nature of RCD makes them promising therapeutic targets. Better understanding of RCD mechanisms and crosstalk between RCD subtypes likely shed light on novel therapy development for HIE. The identification of a potential RCD converging node may open up the opportunity for simultaneous and synergistic inhibition of cell death in the immature brain.
