Force-pCa relation and troponin T isoforms of rabbit myocardium.
Force-pCa relation and troponin T isoforms of rabbit myocardium.
复制标题
兔心肌力-pCa 关系和肌钙蛋白 T 亚型。
DOI:
10.1161/01.res.69.6.1470
复制
发表时间:
1991
影响因子:
20.1
通讯作者:
Anderson,PA
中科院分区:
文献类型:
--
作者:
Nassar,R;Malouf,NN;Kelly,MB;Oakeley,AE;Anderson,PA
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.
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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:
J. Jin;J. Lin
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:
Schachat,FH;Bronson,DD;McDonald,OB
通讯作者:
McDonald,OB
影响因子:
5.6
作者:
F. Schachat;Michael S. Diamond;P. Brandt
通讯作者:
P. Brandt
影响因子:
4.8
作者:
Larry S. TobacmanS;R. Lee
通讯作者:
R. Lee