Cellular Responses to Mechanical Stress Selected Contribution: Mechanical strain increases force production and calcium sensitivity in cultured airway smooth muscle cells

Cellular Responses to Mechanical Stress Selected Contribution: Mechanical strain increases force production and calcium sensitivity in cultured airway smooth muscle cells
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细胞对机械应力的反应选定的贡献:机械应变增加了培养的气道平滑肌细胞的力产生和钙敏感性

DOI:
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发表时间:
2000
期刊:
影响因子:
--
通讯作者:
F. Brozovich
F. Brozovich
中科院分区:
--
文献类型:
--
作者:
Paul G. Smith;C. Roy;S. Fisher;Qi;F. Brozovich

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史密斯、保罗·G、查蒂·罗伊、史蒂文·费舍尔、黄启全和弗兰克·布罗佐维奇。选择贡献:机械应变增加培养气道平滑肌细胞的力产生和钙敏感性。中国生物医学工程学报(英文版)39(2):444 - 444。-经循环变形应变培养的气道平滑肌细胞肌球蛋白轻链激酶(MLCK)和肌球蛋白含量增加,肌动蛋白细丝形成增加。为了确定这些变化是如何增加细胞收缩力的,我们测量了渗透性细胞中细胞质钙的变化所产生的等长力。菌株细胞产生50%最大力的pCa为6.6 6 0.4,而对照细胞为5.9 6 0.3,表明菌株细胞对钙的敏感性增加。菌株细胞的最大产力也更大(8.6 6 2.9 vs. 5.7 6 3.1 mN)。肌球蛋白轻链不可逆硫代磷酸化后,菌株细胞产生最大力的增加持续存在,表明力的增加不能用肌球蛋白轻链磷酸化的差异来解释。短期张力足以增加细胞骨架组织,但不足以增加可收缩蛋白含量的细胞也会产生更多的力,这表明张力诱导的细胞骨架重组也会增加力的产生。
Smith, Paul G., Chaity Roy, Steven Fisher, Qi-Quan Huang, and Frank Brozovich. Selected Contribution: Mechanical strain increases force production and calcium sensitivity in cultured airway smooth muscle cells. J Appl Physiol 89: 2092–2098, 2000.—Cultured airway smooth muscle cells subjected to cyclic deformational strain have increased cell content of myosin light chain kinase (MLCK) and myosin and increased formation of actin filaments. To determine how these changes may increase cell contractility, we measured isometric force production with changes in cytosolic calcium in individual permeabilized cells. The pCa for 50% maximal force production was 6.6 6 0.4 in the strain cells compared with 5.9 6 0.3 in control cells, signifying increased calcium sensitivity in strain cells. Maximal force production was also greater in strain cells (8.6 6 2.9 vs. 5.7 6 3.1 mN). The increased maximal force production in strain cells persisted after irreversible thiophosphorylation of myosin light chain, signifying that increased force could not be explained by differences in myosin light chain phosphorylation. Cells strained for brief periods sufficient to increase cytoskeletal organization but insufficient to increase contractile protein content also produced more force, suggesting that straininduced cytoskeletal reorganization also increases force production.
DOI: 10.1006/excr.1997.3492
发表时间: 1997-04
影响因子: 3.7
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Endothelin-1 改变培养的胚胎平滑肌细胞的收缩表型。
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发表时间: 1999
期刊: The American journal of physiology
影响因子: --
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DOI: 10.1165/ajrcmb.10.1.8292386
发表时间: 1994
影响因子: 6.4
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通讯作者: Bruce,MC