Abstract
Pretreatment of rats with homotaurine (3 aminopropanesulfonic acid; 3APS), a synthetic gamma-aminobutyric acid (GABA) analog, protected from the convulsant and cytotoxic action of systemically injected kainic acid (KA). Wet dog shaking (WDS) behavior was significantly reduced. Taurine, an inhibitory non-GABA-mimetic amino acid, and muscimol (another direct GABA-agonist) reduced the number of seizures and lesions in the brain but were less effective than homotaurine. Progabide (a GABA-agonist) did not modify kainic acid effects. The neurotoxicity of kainic acid could have been due to repetitive convulsive activity. Activation of GABA-mediated inhibition is an effective, but not the determinant means of preventing KA-induced abnormalities.
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