Tight junction complex (anorectal mucosa) (TJC)

The tight junction complex in the anorectal mucosa is a specialized intercellular structure that regulates the paracellular movement of ions, water, and macromolecules while maintaining a physical barrier against pathogens and toxins [1, 4]. It is composed of transmembrane proteins such as claudins and occludin, which are anchored to the actin cytoskeleton by scaffold proteins like zonula occludens (ZO-1, ZO-2, ZO-3) [2]. In the anorectal region, this barrier is critical for preventing the entry of fecal bacteria and inflammatory mediators into the systemic circulation [3]. Dysfunction of these complexes is associated with conditions such as proctitis, inflammatory bowel disease, and increased susceptibility to sexually transmitted infections [2, 4]. Therapeutic strategies often focus on either strengthening this barrier to treat inflammation or transiently opening it to facilitate the delivery of rectally administered drugs [1, 3].

Other names

Paracellular barrierZonula occludensMucosal barrierEpithelial tight junctionAnorectal mucosal barrier

Modulation of paracellular permeability through the reorganization or regulation of tight junction proteins such as claudins, occludin, and zonula occludens proteins.