Effects of the tetronic acid derivatives AO33 (Losigamone (cas 112856-44-7)) and AO78 on epileptiform activity and on stimulus-induced calcium concentration changes in rat hippocampal slices
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Add time:08/02/2019 Source:sciencedirect.com
The effects of members of a new class anticonvulsants, the tetronic acid derivatives, were studied in 3 in vitro models of epileptogenesis in rat hippocampal slices; the picrotoxin, the low magnesium and the low calcium model. The effects of AO33 (losigamone) and AO78 on stimulus-induced decreases in extracellular calcium concentration were also investigated. In all 3 models of epileptogenesis, both drugs blocked spontaneous and reduced stimulus-induced epileptiform discharges dose dependently and reversibly. Stimulus-induced changes in [Ca2+]0 were markedly diminished by these agents. The fact that the tetronic acid derivatives block the low Ca seizure-like events which develop independently from chemical synaptic transmission suggests that these agents have non-synaptic or direct membrane actions with subsequently reduced cellular excitability.
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