Desmosomal dualism: the core is stable while plakophilin is dynamic

Desmosomal dualism: the core is stable while plakophilin is dynamic
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桥粒二元性:核心是稳定的,而亲斑蛋白是动态的

DOI:
10.1101/2021.03.02.433631
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Fülle J
Fülle J
中科院分区:
--
文献类型:
--
作者:
Fülle J

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桥粒是上皮细胞和心肌细胞之间的强细胞-细胞连接,将中间细丝连接到细胞膜上,并通过组织机械地整合细胞,消除机械应力。它们包括5种主要的蛋白质类别-桥粒素和桥粒蛋白(桥粒体钙粘蛋白),血小板红蛋白,嗜血小板蛋白和桥粒蛋白-它们对桥粒结构和周转的个体贡献知之甚少。利用活细胞成像以及FRAP和FLAP,我们发现桥粒由两种不同的蛋白质组成:一种是由桥粒钙粘蛋白和血小板红蛋白组成的非常稳定的桥粒核心,另一种是高度流动的嗜血小板蛋白。随着桥粒从钙依赖性到钙非依赖性的高黏附成熟,核稳定性增加,但Pkp2a仍保持高度流动性。Desmoplakin最初是可移动的,但随着高度粘连而稳定。我们发现在生长因子诱导的细胞散射过程中,桥粒的下调是通过整个桥粒的内化进行的,桥粒仍然保留一个稳定的核心和高度移动的Pkp2a。Pkp2a的这种分子迁移表明Pkp2a在桥粒中可能具有短暂的调节作用。
Desmosomes, strong cell-cell junctions of epithelia and cardiac muscle, link intermediate filaments to cell membranes and mechanically integrate cells across tissues, dissipating mechanical stress. They comprise 5 major protein classes - desmocollins and desmogleins (the desmosomal cadherins), plakoglobin, plakophilins and desmoplakin - whose individual contribution to the structure and turnover of desmosomes is poorly understood. Using live-cell imaging together with FRAP and FLAP we show that desmosomes consist of two contrasting protein fractions or modules: a very stable desmosomal core of desmosomal cadherins and plakoglobin, and a highly mobile plakophilin. As desmosomes mature from calcium-dependence to calciumindependent hyper-adhesion, core stability increases, but Pkp2a remains highly mobile. Desmoplakin is initially mobile but stabilises with hyper-adhesion. We show that desmosome down-regulation during growth factor-induced cell scattering proceeds by internalisation of whole desmosomes, which still retain a stable core and highly mobile Pkp2a. This molecular mobility of Pkp2a suggests a transient and probably regulatory role for Pkp2a in the desmosome.
哺乳动物表皮中的桥粒形式、命运和功能。
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