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Neurogenesis and epilepsy in the developing brain Porter BEEpilepsia 2008[Jun]; 49 Suppl 5 (Suppl 5): 50-4Multiple studies have highlighted how seizures induce different molecular, cellular, and physiologic consequences in an immature brain as compared to a mature brain. In keeping with these studies, seizures early in life alter dentate granule cell birth in different, and even opposing, fashion to adult seizure models (see Table 1). During the first week of rodent postnatal life, seizures decrease cell birth in the postictal period, but do not alter the maturation of newborn cells. Seizures during the second week of life have varied effects on dentate granule cell birth, either causing no change or increasing birth, and may promote a mild increase in neuronal survival. During the third and fourth weeks of life, seizures begin to increase cell birth similar to that seen in adult seizure models. Interestingly, animals that experienced seizure during the first month of life have an increase in cell birth during adulthood, opposite to the reported decrease in chronic animals experiencing a prolonged seizure as an adult. Children have more ongoing cell birth in the dentate gyrus than adults, and markers of cell division are further increased in children with refractory temporal lobe epilepsy. There are clear age-dependent differences in how seizures alter cell birth in the dentate gyrus both acutely and chronically. Future studies need to focus on how these changes in neurogenesis influence dentate gyrus function and what they imply for epileptogenesis and learning and memory impairments, so commonly found in children with temporal lobe epilepsy.|*Cell Differentiation/physiology[MESH]|Animals[MESH]|Brain/*cytology/*growth & development/pathology[MESH]|Epilepsy/*pathology[MESH]|Humans[MESH]|Neurons/*cytology/pathology/physiology[MESH] |
