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Localization of γ‐aminobutyric acid (GABA) in type 3 cells and demonstration of their source to f2 terminals in the cat lateral geniculate nucleus: A golgi‐electron‐microscopic GABA‐immunocytochemical study
Author(s) -
Montero V. M.
Publication year - 1986
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.902540207
Subject(s) - gabaergic , biology , immunocytochemistry , golgi apparatus , lateral geniculate nucleus , horseradish peroxidase , postsynaptic potential , aminobutyric acid , synaptic vesicle , glutamate decarboxylase , electron microscope , visual cortex , neuropil , neuroscience , geniculate , gamma aminobutyric acid , nucleus , vesicle , biochemistry , central nervous system , cell , receptor , inhibitory postsynaptic potential , endocrinology , enzyme , physics , membrane , optics
Postembedding immunocytochemistry with a γ‐aminobutyric acid (GABA) antiserum was done on semithin sections of cat lateral geniculate nucleus (LGN) previously processed with the rapid‐Golgi and gold‐toning procedures, to determine which of the three main morphological types (1,2,3) of neurons in the A‐laminae show immunoreactivity and are, therefore, presumably GABAergic. Only type 3 cells were found to be GABA positive. These cells were characterized by small somata and few, scarcely branched dendrites bearing almost exclusively appendages with long slender stalks. Some of these cells have extensive filiform “axonlike” processes originating from different regions of dendrites and having appendages similar to those originating directly from dendrites. Many of these Golgi gold‐toned impregnated dendritic appendages of type 3 cells were analyzed in the electron microscope and were identified as typical F2 terminals by (1) their content of pleomorphic synaptic vesicles; (2) by being postsynaptic to retinal (RLP), cortical (RSD), and perigeniculate (F1) terminals; and (3) by being presynaptic to dendrites. In addition, since it was previously demonstrated that glutamic acid decarboxylase (GAD) and GABA‐positive cells are not retrogradely labeled with horseradish peroxidase (HRP) from the visual cortex, the present results, by showing that GABA‐positive cells have type 3 morphology, provide supporting evidence for the interneuronal nature of type 3 cells in cat LGN.