Sweat duct luminal proteins and mucopolysaccharides

Sweat duct luminal proteins and mucopolysaccharides represent the biochemical environment within the eccrine sweat gland's distal duct, primarily consisting of glycoproteins and glycosaminoglycans (StatPearls, 2023). These substances serve as the primary substrate for the action of topical aluminum-based antiperspirants, which are the standard treatment for hyperhidrosis. When applied to the skin, aluminum salts dissolve in sweat and enter the ductal lumen, where they undergo hydrolysis and react with these luminal proteins and mucopolysaccharides to form a gel-like precipitate. This precipitate eventually hardens into a physical "plug" that obstructs the sweat duct at the level of the stratum corneum, effectively preventing the release of sweat onto the skin surface (PubMed, PMID: 1505605). This obstruction is temporary, as the plugs are naturally shed through the process of epidermal desquamation, necessitating regular reapplication of the drug. In addition to their role in hyperhidrosis therapy, these components are involved in the pathogenesis of miliaria, where ductal blockage leads to sweat leakage into the epidermis or dermis (NIH, 2022).

Other names

Luminal sweat duct proteinsSweat duct mucopolysaccharidesEccrine ductal proteinsSweat duct glycosaminoglycans

Topical aluminum salts react with luminal proteins and mucopolysaccharides to form a physical precipitate or "plug" that obstructs the distal sweat duct (PMID: 1505605).