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• W1552804407 abstract "Summary: In order to investigate the K+ channels and their effects on resting membrane potential(Em) and excitability in rat bronchial smooth muscle cells (BSMCs), the components of outward K+channel currents and the effects of K+ channels on Em and tension in rat bronchial smooth musclewere observed by using standard whole-cell recording of patch clamp and isometric tension recordingtechniques. The results showed that under resting conditions, total outward K+ channel currents infreshly isolated BSMCs were unaffected by ATP-sensitive K+ channel blocker. There were two typesof K+ currents: voltage-dependent delayed rectifier K+ channel (Ky) and large conductance calcium-activated K+ channel (BKca) currents. 1 mmol/L 4-aminopyridine (4-AP, an inhibitor of Ky)caused a significant depolarization (from - 8.7 ± 5.9 mV to - 25. 4± 3.1 mV, n = 18, P＜0. 001 ).In contrast, 1 mmol/L tetraethylammonium (TEA, an inhibitor of BKca) had no significant effect onEm (from -37. 6±4.8 mV to -36. 8±4.1 mV, n=12, P＞0. 05). 4-AP caused a concentration-dependent contraction in resting bronchial strips. TEA had no effect on resting tension, but applica-tion of 5 mmol/L TEA resulted in a left shift with bigger pD2(the negative logarithm of the drug con-centration causing 50 % of maximal effect) (from 6. 27±0. 38 to 6.89±0. 54, n=10, P＜0. 05) inthe concentration-effect curve of endothine-1, and a right shift with smaller pD2 (from 8. 10± 0. 23 to7. 69±0. 08, n= 10, P＜0. 05) in the concentration-effect curve of isoprenaline. It was suggestedthat in rat BSMCs there may be two types of K+ channels, Kv and BKca, which serve distinct roles.Kv participates in the control of resting Em and tension. BKca is involved in the regulation of relax-ation or contraction associated with excitation." @default.
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• W1552804407 date "2003-01-01" @default.
• W1552804407 modified "2023-09-28" @default.
• W1552804407 title "K^＋ Channels and Their Effects on Membrane Potential in Rat Bronchial Smooth Muscle Cells" @default.
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