Force-pCa relation and troponin T isoforms of rabbit myocardium.

Force-pCa relation and troponin T isoforms of rabbit myocardium.
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兔心肌力-pCa 关系和肌钙蛋白 T 亚型。

DOI:
10.1161/01.res.69.6.1470
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发表时间:
1991
影响因子:
20.1
通讯作者:
Anderson,PA
Anderson,PA
中科院分区:
医学1区
文献类型:
--
作者:
Nassar,R;Malouf,NN;Kelly,MB;Oakeley,AE;Anderson,PA

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我们以前报道过兔心室肌中存在至少四种肌钙蛋白T亚型,并描述了它们随发育分布的变化。在本报告中,我们测试了肌钙蛋白T亚型的比例是否与肌丝对钙的敏感性有关。我们测量了新生(2-5日龄)家兔12条洗洁精皮肤心肌心室肌束的力- pca关系。我们使用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳和心脏特异性肌钙蛋白T单克隆抗体MAb 13-11探针的Western blots密度扫描,从每条链中确定每个肌钙蛋白T异构体相对于肌钙蛋白T总量的数量。为了评估这些链中不同相对量的心肌肌钙蛋白和慢骨肌钙蛋白I的存在,我们测定了心肌肌钙蛋白I相对于原肌球蛋白的量。我们确定了每条链的Hill系数和半最大力的pCa, pCa50。pCa50与肌钙蛋白T2的相对量有直接关系(pslope = 0.037)。我们的结果并没有显示希尔系数和肌钙蛋白T2之间的关系。我们也没有发现pCa50与心肌肌钙蛋白I/原肌球蛋白比值之间的关系,这表明pCa50与肌钙蛋白T2之间的相关性不是心肌和慢骨骼肌肌钙蛋白I相对量变化的结果。我们的研究结果表明,兔心肌的力- pca特征与其表达的肌钙蛋白T亚型之间存在关系。提示肌钙蛋白T在调节心肌肌丝对钙的敏感性中的作用。
We have previously reported the existence of at least four troponin T isoforms in rabbit ventricular muscle and described the changes in their distribution with development. In this report we test whether the proportions of the troponin T isoforms are related to the sensitivity of the myofilaments to calcium. We measured the force-pCa relations in 12 detergent-skinned ventricular strands of cardiac muscle from newborn (2-5-day-old) rabbits. We determined from each strand the amount of each troponin T isoform relative to the total amount of troponin T by using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and densitometric scans of Western blots probed with a cardiac-specific troponin T monoclonal antibody, MAb 13-11. To assess the presence of different relative amounts of cardiac and slow skeletal troponin I among the strands, we determined the amount of cardiac troponin I relative to tropomyosin. We determined the Hill coefficient and the pCa for half-maximal force, pCa50, for each strand. pCa50 was related directly to the relative amount of troponin T2 (pslope = 0.037). Our results do not indicate a relation between the Hill coefficient and troponin T2. We also did not find a relation between pCa50 and the cardiac troponin I/tropomyosin ratio, which suggests that the correlation between pCa50 and troponin T2 was not a result of changes in the relative amounts of cardiac and slow skeletal muscle troponin I. Our findings indicate that a relation exists between the force-pCa characteristics of rabbit myocardium and the troponin T isoforms that it expresses, suggesting a role for troponin T in modulating the sensitivity of cardiac myofilaments to calcium.
DOI: 10.1016/s0021-9258(18)63868-2
发表时间: 1989-07
期刊: The Journal of biological chemistry
影响因子: --
作者:
J. Putkey;H L Sweeney;S T Campbell
通讯作者: J. Putkey;H L Sweeney;S T Campbell
DOI: --
发表时间: 1988-05
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: J. Jin;J. Lin
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1016/0022-2836(87)90300-7
发表时间: 1987
影响因子: 5.6
作者:
F. Schachat;Michael S. Diamond;P. Brandt
通讯作者: P. Brandt
牛心肌肌钙蛋白 T 亚型的分离和功能比较。
DOI: --
发表时间: 1987
影响因子: 4.8
作者:
Larry S. TobacmanS;R. Lee
通讯作者: R. Lee