367 research outputs found
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IMMUNOCYTOCHEMICAL LOCALIZATION OF GAD WITHIN STELLATE NEURONS OF RAT VISUAL-CORTEX
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A COMBINED GOLGI-ELECTRON MICROSCOPIC ANALYSIS OF PYRAMIDAL BASKET CELLS IN THE DENTATE GYRUS OF THE HIPPOCAMPUS
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The histochemical localization of cytochrome oxidase in the dentate gyrus of the rat hippocampus.
In the dentate gyrus of the rat's hippocampal formation, the activity of an oxidative enzyme, cytochrome oxidase, has been localized mostly to the molecular layer with histochemical methods that utilize diaminobenzidine. The electron microscopic localization of cytochrome oxidase indicated that mitochondria within granule cell dendrites were very reactive while those within the somata and mossy fiber terminals of this neuronal type were less reactive. Caution must be used when predicting the relative physiological activities of neurons with this method because differential activities of this enzyme occur within separate parts of the same neuronal population
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Aspinous and sparsely-spinous stellate neurons in the visual cortex of rats contain glutamic acid decarboxylase.
Glutamic acid decarboxylase (GAD), the enzyme that synthesizes the neurotransmitter gamma-amino-butyric acid (GABA), has been localized in the rat visual cortex by immunocytochemical methods with both light and electron microscopy. In both colchicine-injected and non-injected preparations of the visual cortex, GAD-positive reaction product was observed in somata, proximal dendrites and axon terminals of non-pyramidal neurons. The GAD-positive terminals were observed to form symmetric synaptic junctions most commonly with dendritic shafts and somata of pyramidal and stellate neurons and less frequently with initial axon segments of pyramidal neurons and dendritic spines. In colchicine-injected preparations, GAD-positive somata were located in all cortical layers including the immediately subjacent white matter. In contrast, sections from non-injected rats displayed GAD-positive somata within a superficial and a deep cortical band. The GAD-positive somata observed in both types of preparations received both symmetric and asymmetric synaptic junctions, lacked apical dendrites, and had radially oriented dendrites of small diameter. These characteristics of GAD-positive neurons indicate that they are aspinous and sparsely-spinous stellate neurons. The localization of GAD within these neurons in combination with physiological and pharmacological data indicate that these local circuit neurons mediate GABA-ergic inhibition in the neocortex
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