Glycosaminoglycan Layer of the Urothelium (GAG Layer)

The glycosaminoglycan (GAG) layer of the urothelium is a protective, mucinous coating on the inner surface of the bladder and urinary tract epithelium. It is composed of proteoglycans expressing heparan sulfate, chondroitin sulfate, and dermatan sulfate. This layer acts as a barrier against urine components, toxins, and pathogens, preventing their penetration into deeper bladder layers. Damage or deficiency of the GAG layer is implicated in conditions like interstitial cystitis/bladder pain syndrome, leading to increased permeability, inflammation, and pain. Therapies targeting the GAG layer aim to restore its integrity and function, often using exogenous GAGs like hyaluronic acid or chondroitin sulfate.

Other names

Urothelial GAG LayerBladder GAG LayerGlycosaminoglycan Coat of the BladderGAG Coat

Restoration of the GAG layer, Replenishment of GAGs on the urothelial surface, Reduction of urothelial permeability