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• W1985128045 abstract "omega-Grammotoxin SIA (omega-GsTx SIA), a peptide isolated from tarantula venom, inhibits synaptosomal Ca2+ influx and neurotransmitter release, and blocks N-, P-, and Q-type voltage-gated Ca2+ channels. The whole-cell patch-clamp was used to record glutamatergic excitatory post-synaptic currents (EPSCs) evoked by extracellular stimulation of presynaptic neurons in primary rat hippocampal cultures. EPSCs displayed rapid kinetics and were blocked by CNQX. omega-Conotoxin (1 microM) GVIA inhibited EPSCs by 46%, while 30 nM and 1 microM omega-agatoxin IVA produced 12% and 69% inhibition, respectively, consistent with coupling of N-, P- and Q-type Ca2+ channels to glutamatergic synaptic transmission. omega-GsTx SIA (1 microM) rapidly, completely, and reversibly blocked glutamatergic EPSCs, but did not affect currents evoked by bath application of kainate. Thus, omega-GsTx SIA blocks glutamatergic synaptic transmission by blocking presynaptic voltage-gated Ca2+ channels. omega-GsTx SIA is the only agent that blocks selectively and reversibly the Ca2+ channels coupled to glutamate release. omega-GsTx SIA provides a unique and powerful tool for experiments requiring recovery of function following presynaptic block of synaptic transmission." @default.
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• W1985128045 date "1995-12-01" @default.
• W1985128045 modified "2023-09-27" @default.
• W1985128045 title "Complete and reversible block by ω-grammotoxin SIA of glutamatergic synaptic transmission between cultured rat hippocampal neurons" @default.
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• W1985128045 doi "https://doi.org/10.1016/0304-3940(95)12169-2" @default.
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