Summary
The influence of the excitotoxin kainic acid (KA) on cultivated explants of rat hippocampus was investigated. Addition of 3 μM KA to the culture medium over 24–48 h induced a destruction of the pyramidal cells in the CA3 region, whereas the CA1 pyramidal cells and the granule cells were left undamaged. Higher concentrations (10–100 μM) of KA destroyed also the latter cell groups. The selectivity of the KA lesion at 3 μM was further indicated by the fact that the acetylcholinesterase-positive neurons in the hippocampus were not destroyed through KA administration and that the stereoisomer dihydrokainic acid was ineffective in inducing lesions. Application of tetrodotoxin did not protect the CA3 pyramidal cells from KA lesion, whereas γ-glutamylaminomethylsulphonic acid (GAMS) only offered a very small, statistically not significant, protection. Baclofen protected the cultures slightly from KA lesions but not when added together with GAMS. Possible mechanisms responsible for the KA lesions in these cultures are discussed.
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Supported in part by a grant from the Swiss National Foundation for Scientific Research (No. 3.528.-0.83)
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Rimvall, K., Keller, F. & Waser, P.G. Selective kainic acid lesions in cultured explants of rat hippocampus. Acta Neuropathol 74, 183–190 (1987). https://doi.org/10.1007/BF00692850
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DOI: https://doi.org/10.1007/BF00692850