Dynamic properties of the tight junction barrier.

Dynamic properties of the tight junction barrier.
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DOI:
10.1111/j.1749-6632.2012.06528.x
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发表时间:
2012-06
影响因子:
5.2
通讯作者:
Weber CR
Weber CR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Weber CR

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紧密连接的主要作用是密封顶端细胞间隙并限制离子和分子的细胞旁通量。尽管紧密连接形成了高度交联的结构,但功能研究提出了这样的假设:紧密连接势垒是动态的,并且由打开和关闭事件定义。然而,不可能以足够的分辨率直接测量紧密连接屏障功能来检测此类事件。然而,最近的电生理学和筛分研究对至少两种跨密封连接通量途径的存在提供了深刻的见解:高容量离子选择性“孔”途径和允许大分子通过的低容量“泄漏”途径。此外,现在已知紧密连接分子结构是高度动态的,并且动态与屏障功能相关。总而言之,这些数据支持紧密结电导的动态模型,并表明紧密结打开和关闭的调节可能提供屏障调节的敏感方法。
A principal role of tight junctions is to seal the apical intercellular space and limit paracellular flux of ions and molecules. Despite the fact that tight junctions form heavily cross-linked structures, functional studies have fostered the hypothesis that the tight junction barrier is dynamic and defined by opening and closing events. However, it has been impossible to directly measure tight junction barrier function with sufficient resolution to detect such events. Nevertheless, recent electrophysiological and sieving studies have provided tremendous insight into the presence of at least two pathways of trans-tight junction flux: a high-capacity ion-selective “pore” pathway and a low-capacity “leak” pathway that allows the passage of macromolecules. Furthermore, it is now known that the tight junction molecular structure is highly dynamic and that dynamics are correlated with barrier function. Taken together, these data support a dynamic model of tight junction conductance and suggest that regulation of tight junction openings and closings may provide sensitive means of barrier regulation.
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