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- W2012288580 abstract "High-threshold neuronal voltage-sensitive Ca2+ channels (VSCCs) have been classified into at least three subtypes, including L, N, and P, based on biophysical and pharmacological criteria. We examined K(+)-induced 45Ca2+ flux into rat neocortical mini-slices to determine which of these subtype(s) might be involved in this phenomenon. Neither the L-type Ca2+ channel antagonist isradipine at 10 microM nor the N-type antagonist omega-conotoxin GVIA at 1 microM were effective antagonists of 45Ca2+ flux in this model. However, the P-type Ca2+ channel antagonist, omega-Aga-IVA, blocked 70% of flux at 200 nM, with an IC50 of 17 nM, strongly implicating P-type Ca2+ channel involvement in K(+)-stimulated Ca2+ entry into mammalian nerve terminals. About 30% of the flux response was resistant to the action of omega-Aga-IVA, suggesting that a still uncharacterized subtype of VSCC is involved in Ca2+ entry into mammalian nerve terminals. Both the omega-Aga-IVA sensitive and insensitive components of 45Ca2+ flux were blocked by the diphenylalkylpiperazines, lidoflazine and flunarizine (IC50 = 6.4 microM and 11 microM, respectively), which have dual Na+/Ca2+ channel blocking actions." @default.
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- W2012288580 title "K+-stimulated 45Ca2+ flux into rat neocortical mini-slices is blocked by ω-Aga-IVA and the dual channel blockers lidoflazine and flunarizine" @default.
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- W2012288580 doi "https://doi.org/10.1016/0304-3940(93)90621-q" @default.
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