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• W2128491503 startingPage "6650" @default.
• W2128491503 abstract "The most common type of epilepsy in adults is temporal lobe epilepsy. After epileptogenic injuries, dentate granule cell axons (mossy fibers) sprout and form new synaptic connections. Whether this synaptic reorganization strengthens recurrent inhibitory circuits or forms a novel recurrent excitatory circuit is unresolved. We labeled individual granule cells <i>in vivo</i>, reconstructed sprouted mossy fibers at the EM level, and identified postsynaptic targets with GABA immunocytochemistry in the pilocarpine model of temporal lobe epilepsy. Granule cells projected an average of 1.0 and 1.1 mm of axon into the granule cell and molecular layers, respectively. Axons formed an average of one synapse every 7 μm in the granule cell layer and every 3 μm in the molecular layer. Most synapses were with spines (76 and 98% in the granule cell and molecular layers, respectively). Almost all of the synapses were with GABA-negative structures (93 and 96% in the granule cell and molecular layers, respectively). By integrating light microscopic and EM data, we estimate that sprouted mossy fibers form an average of over 500 new synapses per granule cell, but <25 of the new synapses are with GABAergic interneurons. These findings suggest that almost all of the synapses formed by mossy fibers in the granule cell and molecular layers are with other granule cells. Therefore, after epileptogenic treatments that kill hilar mossy cells, mossy fiber sprouting does not simply replace one recurrent excitatory circuit with another. Rather, it replaces a distally distributed and disynaptic excitatory feedback circuit with one that is local and monosynaptic." @default.
• W2128491503 created "2016-06-24" @default.
• W2128491503 creator A5017440715 @default.
• W2128491503 creator A5067133398 @default.
• W2128491503 creator A5072882623 @default.
• W2128491503 date "2002-08-01" @default.
• W2128491503 modified "2023-10-18" @default.
• W2128491503 title "Axon Sprouting in a Model of Temporal Lobe Epilepsy Creates a Predominantly Excitatory Feedback Circuit" @default.
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• W2128491503 doi "https://doi.org/10.1523/jneurosci.22-15-06650.2002" @default.
• W2128491503 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6758164" @default.
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• W2128491503 hasPublicationYear "2002" @default.
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