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Roles of ZO-1 and ZO-2 in establishment of the belt-like adherens and tight junctions with paracellular permselective barrier function.

Ann. N. Y. Acad. Sci.2009 May;1165:44-52
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摘要


Tight junctions (TJs) create the primary permselective barrier to diffusion of solutes and ions through the paracellular pathway. The molecular architecture of TJs has gradually been unraveled in recent years, providing the basis for "barriology" (defined by Shoichiro Tsukita as the science of the barrier in multicellular organisms). Claudins are now considered to be the essential basic components of TJ strands, with which other integral membrane proteins, such as occludin, tricellulin, JAMs, and CAR, are associated. Peripherally associated scaffolding proteins are required for the organization of the integral membrane proteins. Among these, ZO-1, -2, and -3 have attracted a great deal of attention as TJ organizers, since ZO-1 (and in some cases, also ZO-2/3) was reported to be directly associated with claudins, occludin, and JAMs, as well as with AF-6/afadin and alpha-catenin. Here we summarize recent studies on ZO-1/2/3-deficiency in mice and cells, which have provided clear and important information regarding the functions of ZO-1/2/3 in vivo. In addition to the respective suppression of ZO-1/2/3 expression, simultaneous suppression of all three proteins has revealed the essential and nonessential in vivo roles of ZO-1/2 and ZO-3, respectively. ZO-3 shows an epithelial-specific TJ localization in a ZO-1/2-dependent fashion. ZO-1 and ZO-2 play pivotal roles in the final establishment of the belt-like adherens junctions (zonula adherens), followed by the formation of the belt-like TJs (zonula occludens) with paracellular barrier function, thereby providing the general basis for selective paracellular permeability in epithelial and endothelial cells.

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