Skin and mucosal barrier

The skin and mucosal surface barrier refers to the body's primary structural and functional defense system, comprising the epidermis of the skin and the mucosal linings of organs such as the gut, respiratory tract, and genitourinary tract. These barriers are formed primarily by tightly joined epithelial cells and protective secretions (e.g., mucus, antimicrobial peptides, and acidic environments)[1][2][3][4]. The main biological functions are to prevent entry of pathogens, retain moisture, and mediate selective absorption and immune surveillance. Disruption of these barriers due to disease, injury, or genetic defects can lead to increased susceptibility to infection, inflammation, and various chronic diseases. Important caveat: This entry should not be considered a single therapeutic target or receptor. Instead, it describes a system composed of many cell types, proteins, junctional complexes (e.g., tight junctions, desmosomes), and secreted factors (e.g., mucus, antimicrobial peptides) that collectively provide barrier function[1][2][3][4]. For molecule-specific drug target analysis, consider focusing on well-defined components such as "Claudin-1" (a tight junction protein), "Filaggrin" (involved in skin barrier), or "Occludin" (another tight junction protein), rather than the overall "skin/mucosal surface barrier."

Other names

skin barriermucosal barrierepithelial barrierbarrier immune system