Calcium kinetics and energetics in myocardium. Simulation study.

Calcium kinetics and energetics in myocardium. Simulation study.
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心肌中的钙动力学和能量学。

DOI:
10.1536/ihj.32.57
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发表时间:
1991
期刊:
Japanese heart journal
影响因子:
--
通讯作者:
T. Takasago
T. Takasago
中科院分区:
--
文献类型:
--
作者:
H. Suga;Y. Goto;S. Futaki;O. Kawaguchi;H. Yaku;K. Hata;T. Takasago

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我们进行了模拟研究,以获得洞察钙(Ca 2+)瞬变和能量之间的关系处理Ca 2+兴奋收缩(EC)耦合。该模拟包括肌浆网(SR)释放的总Ca 2+、肌浆游离Ca 2+离子浓度和肌钙蛋白(Tn)-Ca复合物浓度([TnCa])之间的基本Ca 2+动力学。从SR释放的总Ca 2+被任意设置为一个脉冲和三个速率常数被用于Ca 2+结合到Tn,Ca 2+从Tn解离,和Ca 2+的SR摄取。结果表明,峰值Ca 2+瞬态变化很大,作为收缩机械的Ca 2+敏感性的倒数,尽管恒定的总释放的Ca 2+,因此,一个恒定的能量为Ca 2+处理。这一结果表明,当收缩机械的Ca 2+敏感性改变时,Ca 2+瞬变的幅度与Ca 2+处理的能量之间存在不成比例的关系。
We carried out a simulation study to obtain insight into the relation between calcium (Ca2+) transients and energy for handling Ca2+ in excitation-contraction (EC) coupling. The simulation incorporated basic Ca2+ kinetics among total released Ca2+ from sarcoplasmic reticulum (SR), myoplasmic free Ca2+ ion concentration, and troponin (Tn)-Ca complex concentration ([TnCa]). The total Ca2+ released from the SR was arbitrarily set as an impulse and three rate constants were used for Ca2+ binding to Tn, Ca2+ dissociation from Tn, and Ca2+ uptake by SR. The results showed that the peak Ca2+ transient varies widely as a reciprocal of the Ca2+ sensitivity of the contractile machinery, despite constant total released Ca2+ and hence, a constant energy for Ca2+ handling. This result suggests a disproportate relationship between the magnitude of Ca2+ transients and the energy for Ca2+ handling when the Ca2+ sensitivity of contractile machinery changes.
DOI: --
发表时间: 1986-03
期刊: Circulation
影响因子: 37.8
作者:
M. Endoh;T. Yanagisawa;N. Taira;Blinks
通讯作者: M. Endoh;T. Yanagisawa;N. Taira;Blinks
DOI: 10.1016/s0021-9258(19)70187-2
发表时间: 1980-12
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: M. Holroyde;S. P. Robertson;J. Johnson;R. Solaro;J. D. Potter
DOI: 10.1161/01.res.66.5.1268
发表时间: 1990-05-01
影响因子: 20.1
作者:
KUSUOKA, H;KORETSUNE, Y;MARBAN, E
通讯作者: MARBAN, E
DOI: 10.1016/s0006-3495(81)84868-0
发表时间: 1981-01-01
影响因子: 3.4
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通讯作者: POTTER, JD
改变肌原纤维对 Ca 的反应作为正性肌力机制。
DOI: --
发表时间: 1986
期刊: Circulation
影响因子: 37.8
作者:
Blinks,JR;Endoh,M
通讯作者: Endoh,M