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Modulating effect of apolipoprotein E polymorphisms on secondary brain insult and outcome after childhood brain
T Y M Lo1, P A Jones, I R Chambers
1Section of Child Life & Health, University of Edinburgh, 20 Sylvan Place, Edinburgh, EH 9 1LF, UK. mils.lo@doctors.org.uk
Insights
Apolipoprotein E (APO E) alleles influence outcomes in children with brain trauma. APO E e4 carriers experienced less cerebral perfusion pressure (CPP) insult, while e3 homozygotes showed good recovery despite significant CPP insult.
Area of Science:
- Neuroscience
- Genetics
- Pediatric Critical Care
Background:
- Traumatic brain injury (TBI) in children can lead to significant morbidity and mortality.
- Cerebral perfusion pressure (CPP) is a critical indicator of brain oxygenation and outcome.
- Apolipoprotein E (APO E) gene polymorphisms are associated with various neurological conditions.
Purpose of the Study:
- To investigate the association between APO E alleles, CPP insult severity, and clinical outcomes in pediatric TBI patients.
- To determine if APO E genotype influences the brain's tolerance to ischemic insults following TBI.
Main Methods:
- Prospective case-control study involving 65 critically ill children with TBI.
- Genotyping for APO E alleles and correlation with age-related CPP insult quantification.
- Assessment of neurological status at intensive care discharge and 6-month global outcome.
Main Results:
- Children with the APO E e4 allele and poor outcomes had significantly lower CPP insult levels compared to non-e4 carriers.
- APO E e3 homozygotes with good recovery tolerated substantially higher CPP insults than non-e3 homozygotes.
- These findings suggest a differential impact of APO E alleles on cerebral ischemic tolerance.
Conclusions:
- APO E genotype may modulate the brain's response to ischemic injury in pediatric TBI.
- Understanding the role of APO E alleles could inform targeted therapeutic strategies for TBI management in children.
- Further research is warranted to elucidate the precise mechanisms underlying APO E's neuroprotective or detrimental effects in pediatric TBI.
Objective:
The aim of this study was to determine the relationship between apolipoprotein E (APO E) alleles, the amount of cerebral perfusion pressure (CPP) insult and outcome in children after brain trauma.
Materials And Methods:
In a prospective two-centre case-control study, the APO E genotypes of 65 critically ill children admitted after brain trauma were correlated with age-related CPP insult quantification, conscious state at the time of discharge from intensive care and global outcome at 6 months post-injury. One hundred sixty healthy age- and sex-matched children were genotyped as controls.
Results:
The CPP insult level among the e4 carriers with poor outcome was significantly less than the non-e4 carriers (p=0.03). Homozygotic e3 patients with good recovery did so despite having suffered nearly 26 times more CPP insult than those who were not e3 homzygous (p=0.02).
Conclusion:
Different APO E alleles may potentially affect cerebral ischaemic tolerance differently in children after brain trauma.
