Pores in the wall: claudins constitute tight junction strands containing aqueous pores.

Pores in the wall: claudins constitute tight junction strands containing aqueous pores.
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DOI:
10.1083/jcb.149.1.13
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发表时间:
2000-04-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Furuse M
Furuse M
中科院分区:
其他
文献类型:
--
作者:
Tsukita S;Furuse M

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在脊椎动物中,紧密连接 (TJ) 1 在密封上皮细胞和内皮细胞片的细胞间隙方面发挥着核心作用(Schneeberger 和 Lynch,1992;Gumbiner,1993;Anderson 和 van Itallie,1995)。如果没有 TJ,这些细胞片就无法充当建立成分不同的流体隔室的屏障。为了维持体内平衡,必须选择性地在这些细胞片上运输各种材料。这种运输有两种不同的途径:跨细胞途径和细胞旁途径,其中物质分别穿过质膜和 TJ(Spring,1998;图 1)。参与跨细胞途径运输的分子机制(即通道、泵、转运蛋白等)已在分子术语中得到鉴定和充分表征。与此形成鲜明对比的是,我们对旁细胞转运的了解有限,主要是因为缺乏有关 TJ 分子结构的信息。然而,最近对 TJ 特异性整合膜蛋白的鉴定促使我们考虑 TJ 屏障背后的分子机制以及跨 TJ 的运输。
In vertebrates, tight junctions (TJs) 1 play a central role in sealing the intercellular space in epithelial and endothelial cellular sheets (Schneeberger and Lynch, 1992; Gumbiner, 1993; Anderson and van Itallie, 1995). Without TJs, these cellular sheets cannot function as barriers to establish compositionally distinct fluid compartments. To maintain homeostasis, various materials must be selectively transported across these cellular sheets. Two distinct pathways are known for this transport: the transcellular and paracellular pathways in which materials move across plasma membranes and TJs, respectively (Spring, 1998; Fig. 1). The molecular machinery involved in transport through the transcellular pathway (ie, channels, pumps, transporters, etc.) has been identified and well characterized in molecular terms. In sharp contrast, our knowledge regarding paracellular transport is limited mainly because of the lack of information on the molecular architecture of TJs. However, recent identification of TJ-specific integral membrane proteins prompted us to consider the molecular mechanism behind the barrier of TJs as well as transport across TJs.
三个紧密连接相关的Maguks ZO-1,ZO-2和ZO-3与Claudins的Cooh Termini直接结合。
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发表时间: 1999-12-13
期刊: The Journal of cell biology
影响因子: --
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