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• W1481565402 abstract "The component of the venom of the Taiwanese banded krait Bungarus multicinctus, beta-bungarotoxin (beta-BuTx), acts as an extremely potent inducer of neuronal apoptosis when applied to rat hippocampal cultures. While induction of cell death is dependent on toxin binding to voltage-activated K+ channels and subsequent internalization, the pro-apoptotic signals triggered by picomolar concentrations of beta-BuTx are not understood. Following toxin binding, a dramatic increase in intracellular Ca2+ became detectable after 30 min, and in reactive oxygen species (ROS) after 3-4 h. Conversely, Ca2+ chelators, radical quenchers and antioxidants efficiently antagonized beta-BuTx induced apoptosis. As shown for the antioxidant 2,3-dihydroxybenzoic acid, analysis by matrix assisted laser desorbtion-time of flight (MALDI-TOF) mass spectrometry excluded the protective effects to be due to reductive cleavage of the toxic beta-BuTx dimer. Inhibitors of the intracellular antioxidant defence system enhanced neuronal susceptibility to beta-BuTx, supporting the essential role of ROS in beta-BuTx-initiated apoptosis. Cell damage was accompanied by an accumulation of markers of oxidative cell stress, phospholipid hydroxyperoxides and the lipid peroxidation product, malonyl dialdehyde. These observations indicate that beta-BuTx-induced cell death resulted from an intracellular signalling cascade involving subsequent stages of a dramatic rise in free Ca2+, the accumulation of ROS, membrane lipid peroxidation and, finally, apoptosis." @default.
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• W1481565402 date "2003-09-19" @default.
• W1481565402 modified "2023-10-17" @default.
• W1481565402 title "Induction by β-bungarotoxin of apoptosis in cultured hippocampal neurons is mediated by Ca2+-dependent formation of reactive oxygen species" @default.
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• W1481565402 doi "https://doi.org/10.1046/j.1471-4159.2003.02035.x" @default.
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