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The levels of GABA in mouse brain following tissue inactivation by microwave irradiation 1

GABA LEVELS in whole and regional brain areas increase after death. This rise can be prevented by a rapid inactivation of the enzymes involved in the metabolism of GABA (LOVELL et at., 1963; MINARD & MUSHAWAR, 1966; SHANK & APRISON, 1971; ALDERMAN & SHELLENBERGER, 1974). Until recently, the most common technique for inactivation of brain enzymes has been rapid freezing with liquid nitrogen. However, cerebral tissue is inactivated at different rates depending upon the depth of the tissue (RICHTER & DAWSON, 1948; SWAAB, 1971), removal and dissection of frozen brain can be difficult and time-consuming, and thawing of the frozen tissue results in reactivation of some enzymes. Microwave inactivation of tissue eliminates these problems by rapidly and irreversibly inactivating the enzyme systems in the brain (STAVINOHA et al., 1970). This method has been used to determine regional brain levels of acetylcholine (STAVINOHA et al., 1973), cyclic AMP (JONES et al., 1974), and labile intermediary metabolites (MEDINA et al., 1975). We have applied this method of inactivation to determine GABA levels in discrete brain areas in mice.