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• W2006959042 abstract "Single high-voltage-activated (HVA) Ca2+ channel activity was recorded in rat insulinoma RINm5F cells using cell-attached and outside-out configurations. Single-channel recordings revealed three distinct Ca2+ channel subtypes: one sensitive to dihydropyridines (DHPs)-(L-type), another sensitive to omega -conotoxin (CTx)-GVIA (N-type) and a third type insensitive to DHPs and omega -CTx-GVIA (non-L-, non-N-type). The L-type channel was recorded in most patches between -30 and +30 mV. The channel had pharmacological and biophysical features similar to the L-type channels described in other insulin-secreting cells (mean conductance 21 pS in control conditions and 24 pS in the presence of 5 microM Bay K 8644). The non-L-, non-N-type channel was recorded in cells chronically treated with omega -CTx-GVIA in the presence of nifedipine to avoid the contribution of N- and L-type channels. Channel activity was hardly detectable below -10 mV and was recruited by negative holding potentials (< -90 mV). The channel open probability increased steeply from -10 to + 40 mV. Different unitary current sublevels could be detected and the current voltage relationship was calculated from the higher amplitude level with a slope conductance of 21 pS. Channel activity lasted throughout depolarizations of 300-800ms with little sign of inactivation. Above 0 mV the channel showed a persistent flickering kinetics with brief openings (tau o 0.6 ms) and long bursts (tau burst 60 ms) interrupted by short interburst intervals. The third HVA Ca2+ channel subtype, the N-type, had biophysical properties similar to the non-L-, non-N-type and was best identified in outside-out patches by its sensitivity to omega -CTx-GVIA. The channel was detectable only above -10 mV from a -90 mV holding potential, exhibited a fast flickering behaviour, persisted during prolonged depolarizations and had a slope conductance of about 19 pS. The present data provide direct evidence for a slowly inactivating non-L-, non-N-type channel in insulin-secreting RINm5F cells that activates at more positive voltages than the L-type channel and indicate the possibility of identifying unequivocally single HVA Ca2+ channels in cell-attached and excised membrane patches under controlled pharmacological conditions." @default.
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• W2006959042 date "1996-01-01" @default.
• W2006959042 modified "2023-09-27" @default.
• W2006959042 title "A single non-L-, non-N-type Ca2+ channel in rat insulin-secreting RINm5F cells" @default.
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• W2006959042 doi "https://doi.org/10.1007/bf02207271" @default.
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