A new perspective on intercalated disc organization: implications for heart disease.

A new perspective on intercalated disc organization: implications for heart disease.
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DOI:
10.1155/2010/207835
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发表时间:
2010
影响因子:
1.5
通讯作者:
Radice GL
Radice GL
中科院分区:
其他
文献类型:
--
作者:
Li J;Radice GL

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粘附连接和桥粒是细胞间粘附连接,并且对于经受高机械应力的组织(包括心脏和皮肤)的形态发生、分化和维持是必需的。不同的连接复合体组织在心肌细胞的末端,称为闰盘。通过编码桥粒蛋白的基因突变破坏粘附完整性导致遗传性心脏病,即致心律失常性右心室心肌病(ARVC)。除了由粘附连接和桥粒共享的斑珠蛋白之外,其他桥粒组分桥粒芯糖蛋白-2、桥粒胶原蛋白-2、斑嗜蛋白-2和桥粒斑蛋白也存在于心肌的超微结构限定的筋膜粘附连接中,但不存在于其他组织中。这种混合型的连接结构被称为混合粘附连接或区域复合。桥粒斑嗜蛋白-2直接与粘附连接蛋白α T-连环蛋白相互作用,在钙粘蛋白-连环蛋白复合物和桥粒之间提供新的分子连接。复合区仅存在于哺乳动物心脏闰盘中,表明它在高等脊椎动物心脏中的进化是为了加强机械耦合。本文就不同连接之间的相互作用及其在ARVC发病机制中的意义作一综述。
Adherens junctions and desmosomes are intercellular adhesive junctions and essential for the morphogenesis, differentiation, and maintenance of tissues that are subjected to high mechanical stress, including heart and skin. The different junction complexes are organized at the termini of the cardiomyocyte called the intercalated disc. Disruption of adhesive integrity via mutations in genes encoding desmosomal proteins causes an inherited heart disease, arrhythmogenic right ventricular cardiomyopathy (ARVC). Besides plakoglobin, which is shared by adherens junctions and desmosomes, other desmosomal components, desmoglein-2, desmocollin-2, plakophilin-2, and desmoplakin are also present in ultrastructurally defined fascia adherens junctions of heart muscle, but not other tissues. This mixed-type of junctional structure is termed hybrid adhering junction or area composita. Desmosomal plakophilin-2 directly interacts with adherens junction protein alphaT-catenin, providing a new molecular link between the cadherin-catenin complex and desmosome. The area composita only exists in the cardiac intercalated disc of mammalian species suggesting that it evolved to strengthen mechanical coupling in the heart of higher vertebrates. The cross-talk among different junctions and their implication in the pathogenesis of ARVC are discussed in this review.
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