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- W2023894474 abstract "1 Inside-out recordings from rat cortical fused nerve terminals indicate that the most common channel observed was a large conductance K+ (BK) channel with characteristics dissimilar to conventional cell body calcium-activated BK (BKCa) channels. 2 BK channels exhibit mode switching between low (mode 1) and high (mode 2) activity, an effect not influenced by membrane voltage. Increasing internal Ca2+ concentration increased time spent in mode 2 as did application of protein kinase A, an effect not mimicked by protein kinase C or protein kinase G. 3 Mode 1 activity was voltage independent although depolarization increased mode 2 channel activity. Global average channel activity was voltage and Ca2+ dependent. 4 Alkaline phosphatase treatment induced channel activity to reside permanently in mode 2, where activity was voltage and Ca2+ dependent but unaffected by protein kinases A, G or C. 5 Internal application of tetraethylammonium blocked BK channel activity in a manner identical to that reported for BKCa channels. 6 These results indicate that nerve terminal membranes have large conductance K+ channels with significant differences in gating kinetics and regulation of activity compared with BKCa channels of other neuronal preparations. The BK channel subtype may play a unique physiological role specific to the nerve terminal." @default.
- W2023894474 created "2016-06-24" @default.
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- W2023894474 date "1998-12-01" @default.
- W2023894474 modified "2023-09-23" @default.
- W2023894474 title "Mode switching characterizes the activity of large conductance potassium channels recorded from rat cortical fused nerve terminals" @default.
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- W2023894474 doi "https://doi.org/10.1111/j.1469-7793.1998.733ba.x" @default.
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