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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >The association of caveolae, actin, and the dystrophin-glycoprotein complex: a role in smooth muscle phenotype and function?
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The association of caveolae, actin, and the dystrophin-glycoprotein complex: a role in smooth muscle phenotype and function?

机译:小窝,肌动蛋白和肌营养不良蛋白-糖蛋白复合物的关联:在平滑肌表型和功能中起作用?

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Smooth muscle cells exhibit phenotypic and mechanical plasticity. During maturation, signalling pathways controlling actin dynamics modulate contractile apparatus-associated gene transcription and contractile apparatus remodelling resulting from length change. Differentiated myocytes accumulate abundant caveolae that evolve from the structural association of lipid rafts with caveolin-1, a protein with domains that confer unique functional properties. Caveolae and caveolin-1 modulate and participate in receptor-mediated signalling, and thus contribute to functional diversity of phenotypically similar myocytes. In mature smooth muscle, caveolae are partitioned into discrete linear domains aligned with structural proteins that tether actin to the extracellular matrix. Caveolin-1 binds with beta-dystroglycan, a subunit of the dystrophin glycoprotein complex (DGC), and with filamin, an actin binding protein that organizes cortical actin, to which integrins and focal adhesion complexes are anchored. The DGC is linked to the actin cytoskeleton by a dystrophin subunit and is a receptor for extracellular laminin. Thus, caveolae and caveolin-associated signalling proteins and receptors are linked via structural proteins to a dynamic filamentous actin network. Despite development of transgenic models to investigate caveolins and membrane-associated actin-linking proteins in skeletal and cardiac muscle function, only superficial understanding of this association in smooth muscle phenotype and function has emerged.
机译:平滑肌细胞表现出表型和机械可塑性。在成熟过程中,控制肌动蛋白动力学的信号传导途径可调节与收缩装置相关的基因转录,以及由于长度变化导致的收缩装置重塑。分化的心肌细胞积聚了大量的小窝,这些小窝从脂质筏与小窝蛋白1的结构结合演变而来,小窝蛋白1具有赋予独特功能特性的结构域。小窝和小窝蛋白1调节并参与受体介导的信号传导,因此有助于表型相似的心肌细胞的功能多样性。在成熟的平滑肌中,小窝被分为与结构蛋白对齐的离散线性域,这些结构蛋白将肌动蛋白束缚在细胞外基质上。 Caveolin-1与抗肌萎缩蛋白糖蛋白复合物(DGC)的一个亚基β-dystroglycan以及与构成皮质肌动蛋白的肌动蛋白结合蛋白filamin结合,整联蛋白和粘着斑复合物锚定在其上。 DGC通过肌营养不良蛋白亚基与肌动蛋白的细胞骨架相连,并且是细胞外层粘连蛋白的受体。因此,小窝和小窝相关的信号蛋白和受体通过结构蛋白连接到动态丝状肌动蛋白网络。尽管开发了研究骨骼肌和心肌功能中的空洞蛋白和膜相关肌动蛋白连接蛋白的转基因模型,但仅出现了对这种平滑肌表型和功能相关性的肤浅理解。

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