Mucopolysaccharides and proteins in eccrine sweat gland ducts

Mucopolysaccharides and proteins in eccrine sweat gland ducts refer to the biochemical components that form obstructive plugs within the sweat duct lumen, a primary feature of the skin condition known as miliaria (heat rash). These plugs are characterized histologically as periodic acid-Schiff (PAS)-positive material, consisting of a complex mixture of glycoproteins, glycosaminoglycans, and cellular debris [1]. The accumulation of this material prevents the normal egress of sweat to the skin surface, leading to increased intraluminal pressure and subsequent rupture of the ductal wall [2]. When the duct ruptures, sweat leaks into the surrounding epidermis or dermis, triggering an inflammatory response that manifests as pruritic vesicles or papules [1][2]. Research indicates that Staphylococcus aureus may contribute to the formation of these plugs by secreting an extracellular polymeric substance (EPS) that acts as a biological adhesive for the mucopolysaccharides and proteins [3]. While not a specific molecular receptor, this protein-polysaccharide complex is the focus of therapeutic interventions aimed at restoring ductal patency. Treatments typically involve the use of keratolytic agents or retinoids, which promote the desquamation of the stratum corneum and the mechanical clearance of the obstructive plug [1][4].

Other names

PAS-positive ductal plugEccrine ductal obstruction materialSweat gland mucopolysaccharide-protein complexExtracellular polymeric substance (EPS) in sweat ducts

Keratolytic agents and topical retinoids facilitate the shedding of the stratum corneum and the physical expulsion of the mucopolysaccharide-protein plug from the eccrine duct, thereby resolving the obstruction and allowing normal sweat flow [1][4].