tight junctions

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tight junctions

Junctions between cells the extracellular surface of whose cell membranes are joined. Tight junctions restrict molecular movement between cells.

zona adherens

tight junctions (continuous with basal aspect of epithelial cells) forming major attachment site of intracellular monofilaments

zona occludens

tight junctions (at apical margins of epithelial cells) forming a barrier to movement of ions/solutes across the epithelium


areas of thickened cellular membrane where filaments attach cells to the basal lamina, and transmembrane elements link the extracellular matrix to intracellular microfilaments; part of the cellular cytoskeleton


tight intercellular junctions formed by apposed areas of thickened cell membrane; intermediate filaments of one cell link with those of an adjacent cell; see cytoskeleton; intermediate filaments
References in periodicals archive ?
4, a new type of chitosan molecular, has been suggested as promising excipients for absorption enhancement based on tight junctions of GI drug in cases in which additional physicochemical properties in the polymer structure were desirable (Gao et al.
Claudin-based tight junctions are crucial for the mammalian epidermal barrier: a lesson from claudin-1deficient mice.
Tight junction (TJ) is an important mode of cell-to-cell adhesions in the epithelial and endothelial cellular sheets, which act as a primary barrier that prevents the diffusion of solutes through the intercellular space, especially in the intestine (Tsukita et al.
coli, while the blue one is the expression of Occludin intestinal tight junctions in the duodenum, jejunum and ileum with the molecular weight in range of 62-82 kDa due to the supplemented probiotics LIS 20506 on rats after induced by LPS.
Barriers and channels formed by tight junction proteins 1.
23] This is because cytokines appear to induce a marked reduction in intestinal levels of membrane-associated proteins (such as occludin and zona occludens protein-1), which are crucial regulators of intestinal tight junctions, as has been shown in shock models.
Cells have built in pathways that regulate tight junctions, in part by controlling the levels of both JAM and claudin.
Tight junctions are composed of transmembrane proteins occludin, claudins and junctional adhesion molecules which intercalate with corresponding proteins from adjacent cells to form the intercellular barrier.
The second theory holds that GERD causes acid-peptic damage to the epithelial tight junctions, which leads to increased permeability and subsequent recruitment of inflammatory cells, especially eosinophils.
However, in order to function normally, it requires not only an intact epithelium with cells joined by tight junctions but also coordinated function of a cooperative network made up of multiple cell types that occupy distinct anatomical positions [10].
signaling), cell matrix adhesions in three dimensions, cell-cell junctions, signaling to and through the endothelial adherens junction, gap junctions (connexin functions), tight junctions in simple and stratified epithelium, desmosomes in development and disease, cadherin trafficking and junction dynamics, and cross-talk in cell-cell and cell-matrix adhesions.