Interaction between ryanodine receptor function and sarcolemmal Ca2+ currents.
Interaction between ryanodine receptor function and sarcolemmal Ca2+ currents.
复制标题
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:
影响因子:
--
通讯作者:
Sutko,JL
中科院分区:
文献类型:
--
作者:
Kenyon,JL;McKemy,DD;Airey,JA;Sutko,JL
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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影响因子:
3.4
作者:
Percival,AL;Williams,AJ;Kenyon,JL;Grinsell,MM;Airey,JA;Sutko,JL
通讯作者:
Sutko,JL
影响因子:
3.5
作者:
D. McGehee;G. Oxford
通讯作者:
G. Oxford
DOI:
10.1073/pnas.82.20.7121
发表时间:
1985
影响因子:
11.1
作者:
L. Rubin
通讯作者:
L. Rubin
DOI:
10.1073/pnas.81.1.262
发表时间:
1984
影响因子:
11.1
作者:
Sherman,SJ;Catterall,WA
通讯作者:
Catterall,WA
影响因子:
6.1
作者:
Pessah,IN;Nieberg,PS;Wilson,BW
通讯作者:
Wilson,BW