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"Our electrophysiological experiments suggest that GABA[gamma amino butyric acid] B receptors are present on presynaptic and postsynaptic membranes at synapses between NG [neurogliaform] cells. Therefore, we undertook an examination of the distribution of GABA B receptor subunits at symmetrical, putative GABAergic synaptic profiles in the SLM of area CA1 involving biocytin-filled NG cells. Immunoparticles for the GABA B1 protein were found on the plasma membrane of both presynaptic and postsynaptic profiles of NG cells (Fig. 9A,B)."
"Figure 9. Subcellular localization of the GABA [gamma amino butyric acid] B1 subunit in neurons of the CA1 SLM [stratum lacunosum moleculare] as revealed by the pre-embedding immunogold method. Aa-Ac, Electron micrographs of consecutive sections showing extrasynaptic localization of GABA B1 (double arrows) in an axon terminal of a biocytin-labeled (peroxidase reaction end product) NG [neurogliaform] cell (T). The bouton establishes symmetrical synaptic contact with a dendritic shaft of an unidentified neuron also labeled for GABA B1 (arrows). B, Electron micrograph showing the localization of the GABA B1 subunit at the extrasynaptic membrane (arrows) of the dendritic shaft of a biocytin-filled (peroxidase) NG [neurogliaform] cell receiving synapses from axon terminals making a symmetrical (T1,T3 )and symmetrical (T2) synapses (arrow-heads).The biocytin-filled bouton (T2) originates from a presynaptic NG cell. The inset in B demonstrates the symmetrical synaptic junction (arrowheads)."
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