Abstract
Regional distributions of endogenous γ-aminobutyric acid (GABA) and ganglion cells in Auerbach's plexus were studied in the gastrointestinal tract of cats. GABA was determined by enzymatic and fluorometric assay. There was a positive correlation between the GABA content and the number of cells in this plexus. We analyzed the precise localization of GABA and glutamic acid decarboxylase (GAD) in individual layers, mucosa, circular and longitudinal muscles and Auerbach's plexus, from freeze-dried sections of cat colon by the enzymatic cycling method. Both GABA contents and GAD activity in Auerbach's plexus were highest in all 4 layers. Thus, the possibility that GABA is synthesized and localized within Auerbach's plexus has to be considered.
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