Enterocytes’tight junctions:From molecules to diseases  

作　　者：Stelios F Assimakopoulos Ismini Papageorgiou Aristidis Charonis 

机构地区：[1]Department of Internal Medicine,University Hospital of Patras,Patras 26504,Greece [2]Institute of Physiology and Pathophysiology,Ruprecht-Karls University of Heidelberg,69120 Heidelberg,Germany [3]Biomedical Research Foundation of the Academy of Athens,Athens 11527,Greece

出　　处：《World Journal of Gastrointestinal Pathophysiology》2011年第6期123-137,共15页世界胃肠病理生理学杂志（英文版）（电子版）

摘　　要：Tight junctions(TJs)are structures between cells where cells appear in the closest possible contact.They are responsible for sealing compartments when epithelial sheets are generated.They regulate the permeability of ions,(macro)molecules and cells via the paracellular pathway.Their structure at the electron microscopic level has been well known since the 1970s;however,only recently has their macromolecular composition been revealed.This review first examines the major macromolecular components of the TJs(occludin,claudins,junctional adhesion molecule and tricellulin)and then the associated macromolecules at the intracellular plaque[zonula occludens(ZO)-1,ZO-2,ZO-3,AF-6,cingulin,7H6].Emphasis is given to their interactions in order to begin to understand the mode of assembly of TJs.The functional significance of TJs is detailed and several mechanisms and factors involved are discussed briefly.Emphasis is given to the role of intestinal TJs and the alterations observed or speculated in diverse disease states.Specifically,intestinal TJs may exert a pathogenetic role in intestinal(inflammatory bowel disease,celiac disease)and extraintestinal diseases (diabetes type 1,food allergies,autoimmune diseases).Additionally,intestinal TJs may be secondarily disrupted during the course of diverse diseases,subsequently allowing the bacterial translocation phenomenon and promoting the systemic inflammatory response,which is often associated with clinical deterioration.The major questions in the field are highlighted.Tight junctions (TJs) are structures between cells where cells appear in the closest possible contact. They are responsible for sealing compartments when epithelial sheets are generated. They regulate the permeability of ions, (macro) molecules and cells via the paracellular pathway. Their structure at the electron microscopic level has been well known since the 1970s; however, only recently has their macromolecular composition been revealed. This review first examines the major macromolecular components of the TJs (occludin, claudins, junctional adhesion molecule and tricellulin) and then the associated macromolecules at the intracellular plaque [zonula occludens (ZO)-1, ZO-2, ZO-3, AF-6, cingulin, 7H6]. Emphasis is given to their interactions in order to begin to understand the mode of assembly of TJs. The functional significance of TJs is detailed and several mechanisms and factors involved are discussed briefly. Emphasis is given to the role of intestinal TJs and the alterations observed or speculated in diverse disease states. Specifically, intestinal TJs may exert a pathogenetic role in intestinal (inflammatory bowel disease, celiac disease) and extraintestinal diseases (diabetes type 1, food allergies, autoimmune diseases). Additionally, intestinal TJs may be secondarily disrupted during the course of diverse diseases, subsequently allowing the bacterial translocation phenomenon and promoting the systemic inflammatory response, which is often associated with clinical deterioration. The major questions in the field are highlighted.

关 键 词：TIGHT JUNCTIONS OCCLUDIN CLAUDINS Junc- tional adhesion molecule Tricellulin Intestinal permeability 

分 类 号：R346[医药卫生—基础医学]