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Journal Article
Research Support, U.S. Gov't, P.H.S.
GABAergic elements in the neuronal circuits of the monkey neostriatum: a light and electron microscopic immunocytochemical study.
Journal of Comparative Neurology 1988 April 9
An antibody raised in rabbits against a GABA-BSA conjugate was used together with the PAP technique to label elements in the neostriatum of three Old World monkeys. Light microscopy revealed numerous immunoreactive medium-size neurons of various staining intensities, some of which had indented nuclei, as well as an occasional large cell. The neuropil showed a plexus of fine processes with frequent puncta. Ultrastructurally, the medium-size GABA-positive neurons were of two types: one with smooth nuclei and scanty cytoplasm, similar to spiny I cells, the other with invaginated nuclear envelopes and more abundant perikaryon, resembling the aspiny type. Correspondingly, labeled dendrites were either spiny or varicose. Some stained axons were myelinated, and the boutons had either large and ovoid, or small and pleomorphic vesicles. All of these boutons formed symmetric synapses, the former type with GABA-positive dendritic shafts but also with unlabeled dendrites; the latter type usually with GABA-negative elements, either dendrites, dendritic spines, or somata. Synapses were also observed between unreactive boutons and immunostained dendrites. Terminals with densely packed, small round vesicles that established asymmetric synapses with spines were always GABA-negative. Glial elements were consistently unlabeled, save for some astroglial endfeet. These findings provide positive evidence for the existence of two classes of GABAergic striatal neurons corresponding to a long-axoned spiny I type and an aspiny interneuron. Furthermore, the simultaneous labeling of GABA-immunoreactive presynaptic and postsynaptic profiles offers possible morphologic bases for the various kinds of intrastriatal inhibitory processes, including the feedforward, feedback, and "autaptic" types.
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