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Histochemistry of gamma aminobutyrate transaminase in spinal cord, spinal and sympathetic ganglia.

The enzyme gamma aminobutyrate transaminase (GABA-T) has been detected biochemically in the mammalian brain and spinal cord, where it shows substantial regional variations, and also in spinal and sympathetic ganglia (Salvador & Albers, 1959; Sheridan, Sims & Pitts, 1967; Graham & Aprison, 1969). GABA-T mediates the first step in the major degradatory pathway of gamma aminobutyric acid (GABA), an amino acid putatively accepted as an inhibitory neurotransmitter of the mammalian central nervous system (see Baxter, 1969). It has been shown that some retinal nerve and glial cells with the ability to accumulate 3H-GABA in vivo and in vitro (Ehinger, 1970; Neal & Iversen, 1972) possess substantial levels of GABA-T activity when examined histochemically (Hyde & Robinson, 1974); this technique enables enzyme activity to be localized precisely at the cellular level. In the present study the histochemistry of GABA-T activity in sympathetic and spinal ganglia, structures which take up and accumulate 3H-GABA in vitro (Bowery & Brown, 1972; Gottesfeld, Kelly & Schon, 1973), has been investigated. The spinal cord has also been investigated in order to obtain information on the localization and activity of GABA-T in its motor and sensory neurons and to correlate these findings with results from earlier studies.