Abstract
Susceptibility to audiogenic seizures can be induced in some strains of resistant mice by exposure to an initial auditory stimulus (acoustic priming). Aminooxyacetic acid, hydrazine, glutamic acid, gamma-aminobutyric acid (GABA), cycloheximide, and metyrapone antagonize the acoustic priming of audiogenic seizure susceptibility in C57BL/6Bg mice, whereas only metyrapone attenuates that of DBA/1Bg- asr mice. The strain difference in the effect of AOAA and cycloheximide is correlated with a small, transient fall in level of brain GABA in C57BL/6Bg but not DBA/1 Bg- asr mice. These findings support our hypothesis that there are at least two neural mechanisms of acoustic priming, each with its own genetic basis and that corticosteroids are required by both mechanisms for the development of primed seizures.
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