Physical barrier for tissue separation

A **physical barrier for tissue separation** refers broadly to anatomical structures (such as tightly joined epithelial or endothelial cell layers) that maintain the separation between tissues and protect underlying tissues from pathogens, toxins, and other environmental factors[1][4][5]. Typical elements forming these barriers include tight junctions, adherens junctions (E-cadherin, catenins), desmosomes (desmogleins), and gap junctions (connexins) between individual cells[1][4][7]. These barriers also dynamically regulate transport of molecules, contribute to tissue homeostasis, and participate in immune responses, but "physical barrier for tissue separation" is not a specific druggable molecular target, receptor, or protein and is therefore not considered a canonical therapeutic target[2][3].

Other names

Physical barrierTissue barrierBiological barrier