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Antiepileptic drugs and apoptosis in the developing brain
Petra Bittigau1, Marco Sifringer, Chrysanthy Ikonomidou
1Department of Pediatric Neurology, Children's Hospital, Charite-Virchow Clinics, Humboldt University, Berlin, Germany. petra.bittigau@charite.de
Annals of the New York Academy of Sciences
|July 11, 2003
Summary
Common antiepileptic drugs (AEDs) cause brain cell death in developing rats. This neurodegeneration may explain cognitive issues and reduced brain size in children exposed to these medications.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Epilepsy is a common neurologic disorder in young individuals.
- Antiepileptic drugs (AEDs) used in children, infants, and pregnant women can cause cognitive impairment, microcephaly, and birth defects through unknown mechanisms.
Purpose of the Study:
- To investigate whether common AEDs induce neurodegeneration in the developing rat brain.
- To explore the underlying mechanisms of AED-induced neurotoxicity.
Main Methods:
- Developing rats (3-30 days old) were administered various AEDs: phenytoin, phenobarbital, diazepam, clonazepam, vigabatrin, or valproic acid.
- Histologic examination of brain tissue was performed to assess neurodegeneration.
- Analysis of neurotrophin expression and signaling pathways (ERK1/2, RAF, AKT) was conducted.
Main Results:
- Common AEDs induced widespread, dose-dependent apoptotic neurodegeneration in the developing rat brain during the critical brain growth spurt period.
- Neurodegeneration occurred at plasma drug concentrations relevant for human seizure control.
- AEDs reduced neurotrophin expression and decreased active forms of ERK1/2, RAF, and AKT signaling pathways.
- Beta-estradiol administration ameliorated AED-induced neurodegeneration.
Conclusions:
- AEDs can cause significant apoptotic neurodegeneration in the developing brain.
- The findings suggest a potential mechanism linking AED exposure to cognitive impairment and reduced brain mass in humans.
- Targeting neurotrophin pathways may offer therapeutic strategies to mitigate AED-induced neurotoxicity.