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Reduced neurogenesis after neonatal seizures
B K McCabe1, D C Silveira, M R Cilio
1Department of Neurology, Harvard Medical School, Children's Hospital, Boston, Massachusetts 02115, USA.
Summary
Neonatal seizures in rats significantly reduce the generation of new neurons in the brain
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Epilepsy Research
Background:
- Neonatal seizures are common but their long-term consequences remain debated.
- While less cell loss occurs in young brains compared to mature ones, seizures can still cause harm.
- Mature brain seizures are known to increase hippocampal neurogenesis.
Purpose of the Study:
- To investigate the impact of recurrent neonatal seizures on neurogenesis in the dentate gyrus.
- To compare neurogenesis in neonatal rats with seizures to control groups and adult rats with seizures.
Main Methods:
- Administered 25 flurothyl-induced seizures to rats between postnatal days 0-4.
- Used 5-bromo-2'-deoxyuridine (BrdU) to label newly formed cells.
- Analyzed BrdU-labeled cells in the dentate gyrus and hilus at various time points post-seizure.
Main Results:
- Neonatal seizures significantly reduced the number of BrdU-labeled cells (new neurons) in the dentate gyrus and hilus.
- This reduction in neurogenesis persisted for at least 6 days after the last seizure.
- Unlike neonatal rats, adult rats with similar seizure burden showed increased neurogenesis.
Conclusions:
- Recurrent seizures during the neonatal period lead to a marked reduction in the generation of new granule cells in the hippocampus.
- This finding contrasts with the known increase in neurogenesis following seizures in the adult brain.
- Neonatal seizures may have distinct and detrimental effects on brain development and neuronal plasticity.