Effects of repeated citalopram treatment on kainic acid-induced neurogenesis in adult mouse hippocampus

Previous studies have demonstrated that systemic administration of kainic acid (KA) triggers a cascade of neuroplastic changes in the hippocampus. Intensive neurodegeneration accompanied by immune response and enhanced neurogenesis following local or systemic KA administration in rats and mice has been reported. KA-induced enhancement in proliferative activity of neuronal and glial precursors results in the appearance of immature hyperactive neurons which could be regarded as evidence of dysregulated neural plasticity. In this study we attempted to investigate whether administration of selective serotonin reuptake inhibitor (SSRI) citalopram could inhibit KA-induced reactive gliosis and dysregulated neurogenesis in mice. The results of our study demonstrate that repeated administration of citalopram counteracted KA-induced reactive gliosis and reduced aberrant proliferative activity in the dentate gyrus of the mouse brain. We found that the population of BrdU-positive cells expressing markers for young neurons was decreased following repeated citalopram administration compared to KA-treated animals. These results suggest that repeated citalopram administration could prevent activation of aberrant neuroplasticity in the damaged hippocampus. (C) 2009 Elsevier B.V. All rights reserved.