Abstract
We have used specific antisera against protein-conjugated γ-aminobutyric acid (GABA) and rat-brain glutamic acid decarboxylase (GAD) in immunocytochemical preparations to study the distribution of putatively GABAergic neurons in the fused thoracic ganglion of the crab Eriphia spinifrons. In the thoracic neuromeres, about 2000 neurons with somata arranged in clusters or located singly in the cell cortex exhibited both GABA-like and GAD-like immunoreactivity. In addition, more than a hundred cells showed only GABA-like immunoreactivity. Fibrous immunoreactive staining to GAD and GABA was distributed throughout the neuropil of the thoracic ganglion, and several fiber tracts contained immunoreactive processes. Sets of serially homologous neurons exhibited GABA-like and GAD-like immunoreactivity in the thoracic neuromeres. Especially prominent were one medial and four ventro-lateral clusters of somata, together with thirteen individually recognized cells in each neuromere. Six of these cells in the ventro-medial cell cortex may be the somata of inhibitory motoneurons. The leg nerves contained three immunoreactive fibers, corresponding to the previously described common inhibitory motoneuron and the two specific inhibitors. The results present further evidence for GABA being the neurotransmitter of all inhibitory leg motorneurons, and suggest its presence and role as a neurotransmitter in a considerable number of interneurons in the thoracic ganglion of the crab.
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Homberg, U., Bleick, A. & Rathmayer, W. Immunocytochemistry of GABA and glutamic acid decarboxylase in the thoracic ganglion of the crab Eriphia spinifrons . Cell Tissue Res 271, 279–288 (1993). https://doi.org/10.1007/BF00318614
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DOI: https://doi.org/10.1007/BF00318614