Interaction between ryanodine receptor function and sarcolemmal Ca2+ currents.

Interaction between ryanodine receptor function and sarcolemmal Ca2+ currents.
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兰尼定受体功能与肌膜 Ca2 电流之间的相互作用。

DOI:
10.1152/ajpcell.1995.269.2.c334
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发表时间:
1995
期刊:
The American journal of physiology.
影响因子:
--
通讯作者:
Sutko,JL
Sutko,JL
中科院分区:
--
文献类型:
--
作者:
Kenyon,JL;McKemy,DD;Airey,JA;Sutko,JL

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我们使用全细胞电压钳技术来研究肌浆网 (SR) 释放 Ca2+ 的破坏对培养 7 或 8 天的鸡肌管肌膜 Ca2+ 电流的影响。使用含有铯和 10 mM 乙二醇-双(β-氨基乙基醚)-N,N,N',N'-四乙酸的移液器记录 145 mM 四乙基氯化铵和 10 mM Ca2+ 中的 Ca2+ 电流。我们发现 Ca2+ 电流的两个组成部分:1) 相对较大的 T 型电流,在 -50 mV 附近激活,并在 100 ms 去极化至 -60 mV 正电势期间失活(它们在 Ba2+ 或 Ca2+ 中的强度相似,对硝苯地平不敏感)和 2) L 型电流在 0 mV 附近激活,在 100 ms 去极化期间很少或没有失活。 (当 Ba2+ 为电荷载体时,它们更大,并被 10 µM 硝苯地平阻断)。在培养基中添加 1 或 100 microM ryanodine 6-7 天会导致 L 型 Ca2+ 电流密度 (pA/pF) 适度但显着增加。 Ryanodine(1 或 100 µM)暴露 1-7 天可将 T 型 Ca2+ 电流密度降低至 < 对照的 10%。相比之下,暴露于 1 µM 兰尼碱 0.5-3 小时对 Ca2+ 电流的任一组成部分均没有显着影响。这些数据表明兰尼定对雏鸡肌管中的 Ca2+ 电流没有直接作用。然而,SR Ca2+ 释放中断> 24 小时会改变肌膜 Ca2+ 通道的表达或功能。
We used the whole cell voltage-clamp technique to investigate the effects of disruption of Ca2+ release from the sarcoplasmic reticulum (SR) on sarcolemmal Ca2+ currents of chick myotubes kept in culture for 7 or 8 days. Ca2+ currents were recorded in 145 mM tetraethylammonium chloride and 10 mM Ca2+ with pipettes containing cesium and 10 mM ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid. We found two components of Ca2+ current: 1) relatively large T-type currents that were activated near -50 mV and inactivated during 100-ms depolarizations to potentials positive to -60 mV (they were of similar magnitude in Ba2+ or Ca2+ and were insensitive to nifedipine) and 2) L-type currents that were activated near 0 mV and showed little or no inactivation during 100-ms depolarizations (they were larger when Ba2+ was the charge carrier and were blocked by 10 microM nifedipine). Addition of 1 or 100 microM ryanodine to the culture medium for 6-7 days caused a modest but significant increase in the L-type Ca2+ current density (pA/pF). Ryanodine (1 or 100 microM) exposure for 1-7 days reduced the T-type Ca2+ current density to < 10% of control. In contrast, exposure to 1 microM ryanodine for 0.5-3 h had no significant effect on either component of Ca2+ current. These data indicate that ryanodine has no direct action on Ca2+ currents in chick myotubes. However, disruption of SR Ca2+ release for > 24 h changes sarcolemmal Ca2+ channel expression or function.
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发表时间: 1994
影响因子: 3.4
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影响因子: 11.1
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发表时间: 1984
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DOI: --
发表时间: 1993
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