Effect of didrovaltrate on l-calcium current in rabbit ventricular myocytes

Effect of didrovaltrate on l-calcium current in rabbit ventricular myocytes
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去氧戊酸对兔心室肌细胞L-钙电流的影响

DOI:
10.1016/s0254-6272(13)60052-7
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发表时间:
2012-09
影响因子:
2.6
通讯作者:
Zhang, Ziguan
Zhang, Ziguan
中科院分区:
医学4区
文献类型:
--
作者:
Xie, Qiang;Li, Weihua;Huang, ZhengRong;Zhang, Ziguan

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方法采用全细胞膜片钳记录技术。结果在30μg/L和10 0μg/L浓度下,钙通道电流(ICa-Lmax)分别由(6.0 1±0.48)pA/pF降至(3.45±0.2 7)pA/pF和(2.16±0.19)pA/pF(42.6%和6 4.1%,n=8,P<0.0 1)。Didrovaltrate使ICa-L的电流-电压曲线上移,但不改变其动作电位、峰电位和反向电位。Didrovaltrate影响ICa-L的稳态失活。半数激活电位(V1/2)由(−2 6±2)mV显著移至(−36±3)mV(n=6,P<0.0 5),斜率因子(K)由(8.8±0.8)mV降至(11.1±0.9)mV(n=6,P<0.0 5)。结论地洛戊酸以浓度依赖的方式阻断ICa-L,并可能抑制处于非活动状态的ICa-L,这可能是其心血管作用的机制之一。
OBJECTIVETo investigate the effect of didrovaltrate on L-type calcium current (Ica-L) in rabbit ventricular myocytes.METHODSWe used the whole cell patch clamp recording technique.RESULTSDidrovaltrate at concentrations of 30 μg/L and 100 μg/L significantly decreased peak ICa-L (ICa-Lmax) from (6.01 ± 0.48) pA/pF to (3.45±0.27) pA/pF and (2.16 ± 0.19) pA/pF (42.6% and 64.1%, n=8, P<0.01), respectively. Didrovaltrate shifted upwards the current-voltage curves of ICa-L without changing their active, peak and reverse potentials. Didrovaltrate affected the steady-state inactivation of ICa-L. The half activation potential (V1/2) was significantly shifted from (−26 ± 2) to (−36 ± 3) mV (n=6, P<0.05), with a significant change in the slope factor (k) (from 8.8 ± 0.8 to 11.1 ± 0.9, n=6, P<0.05). Didrovaltrate did not affect the activation curve.CONCLUSIONDidrovaltrate blocks ICa-L in a concentration-dependent manner and probably inhibits ICa-L in its inactive state, which may contribute to its cardiovascular effect.
DOI: --
发表时间: 1999-07
影响因子: 1.5
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DOI: 10.1007/s10298-008-0329-8
发表时间: 2008-08
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DOI: 10.1023/a:1022576405534
发表时间: 1999-11-01
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DOI: 10.1093/cvr/28.2.280
发表时间: 1994-02-01
影响因子: 10.8
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通讯作者: TYTGAT, J
DOI: 10.1089/107555301300004493
发表时间: 2001
影响因子: 2.6
作者:
R. Upton
通讯作者: R. Upton