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- W2195685976 abstract "The peritumoural neocortex removed from epileptic patients represents an important region for research because of its possible relationship to the generation, maintenance, and propagation of seizures. The peritumoural neocortex removed from an epileptic patient showing a regrowth of an anaplastic astrocytoma was examined in detail using immunocytochemistry for γ-aminobutyric acid, glutamic acid decarboxylase, parvalbumin, nonphosphorylated neurofilament protein, glial fibrillary acidic protein, and histocompatibility antigen HLA-DR. The patterns of immunostaining were compared with the cytoarchitecture and myeloarchitecture in adjacent sections, and with the patterns of immunostaining observed in normal control neocortex. Furthermore, quantitative electron microscopy was used to compare the synaptic densities of presumptive excitatory and inhibitory synapses between regions showing different grades of cytoarchitectural and neurochemical alterations in the peritumoural neocortex, and to compare these regions with normal neocortex. A variety of changes in synaptic circuits in the peritumoural neocortex was found, but it appears that neurons within the less abnormal-looking regions were involved in altered synaptic circuits that might contribute to epileptic activity. In these regions, the most prominent change was the loss of inhibitory synapses on the soma and axon initial segment of pyramidal cells, but numerous excitatory synapses were present on their dendrites that would make these neurons hyperexcitable. However, the most abnormal regions histologically were likely a primary zone for progression of the tumour, with many surviving neurones, but which received and formed very few synapses; thus, they were probably unrelated to the initiation, maintenance, or propagation of seizures." @default.
- W2195685976 created "2016-06-24" @default.
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- W2195685976 date "1997-01-01" @default.
- W2195685976 modified "2023-09-23" @default.
- W2195685976 title "Loss of Inhibitory Synapses on the Soma and Axon Initial Segment of Pyramidal Cells in Human Epileptic Peritumoural Neocortex" @default.
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- W2195685976 doi "https://doi.org/10.1016/s0361-9230(97)00090-7" @default.
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