Force transmission across muscle cell membranes.

Force transmission across muscle cell membranes.
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力通过肌肉细胞膜传递。

DOI:
10.1016/0021-9290(91)90376-x
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发表时间:
1991
影响因子:
2.4
通讯作者:
Tidball,JG
Tidball,JG
中科院分区:
工程技术3区
文献类型:
--
作者:
Tidball,JG

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肌腱连接(MTJs)显示从收缩性细胞骨架蛋白到细胞外结构蛋白的力传递的形态和分子特化。MTJ膜折叠可为结结构中的机械重要特征,因为其减小膜应力且使结主要在剪切下定位用于加载。力可能至少部分地通过包括粘着斑蛋白、talin、整合素、纤连蛋白和胶原蛋白的蛋白质链传递。然而,其他结构蛋白和参与细胞粘附的蛋白质在MTJ处的浓度表明,还存在另外的力传递机制。肌连接蛋白和肌营养不良蛋白是在MTJ发现的肌肉特异性蛋白质,也可能与MTJ力传递有关。在非MTJ膜上的周期性结构,称为costameres,具有与MTJ相似的分子组成,因此也可能参与跨肌肉细胞膜的力传递。肌肉撕裂发生在肌肉使用期间,随后在MTJ处或附近发生停用。废用性萎缩与MTJ折叠减少相关,因此,在加载期间MTJ应力增加。这种膜折叠的减少可能是萎缩肌肉中肌肉撕裂增加的基础。
Myotendinous junctions (MTJs) display both morphological and molecular specializations for force transmission from contractile, cytoskeletal proteins to extracellular, structural proteins. MTJ membrane folding may be a mechanically important feature in junction structure in that it reduces membrane stress and situates the junction for loading primarily under shear. Force is likely to be transmitted, at least in part, by a chain of proteins including vinculin, talin, integrin, fibronectin and collagen. However, the concentration at MTJs of other structural proteins and of proteins involved in cell adhesion indicate that additional, force transmitting mechanisms also exist. Myonexin and dystrophin, muscle-specific proteins found at MTJs, may also be associated with MTJ force transmission. Periodic structures at non-MTJ membrane, called costameres, have molecular compositions similar to MTJs and may therefore also be involved in force transmission across the muscle cell membrane. Muscle tears occurring during muscle use following periods of disuse occur at or near MTJs. Disuse atrophy is associated with decreased MTJ folding and, therefore, an increase in MTJ stress during loading. This decrease in membrane folding may be the basis of increased muscle tears in atrophied muscle.
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