Innovative applications of natural polysaccharide polymers in intravesical therapy of bladder diseases.

Natural polysaccharide polymers, characterized by their remarkable biocompatibility, biodegradability, and structural versatility, hold great promise for intravesical therapy in treating of bladder diseases. Conditions such as bladder cancer and interstitial cystitis compromise drug efficacy by affecting the permeability of the bladder wall. Traditional therapeutic approaches are often hindered by physiological challenges, including rapid drug clearance and the intrinsic permeability barrier of the bladder. Polysaccharides like hyaluronic acid (HA) and chitosan (CS) have emerged as promising materials for intravesical drug delivery systems (IDDS), owing to their ability to repair tight junctions in the bladder wall, mitigate inflammation, and enhance permeability. This review provides a comprehensive overview of the mechanisms through which polysaccharide-based natural polymers regulate bladder wall permeability and highlights their advancements in delivery platforms, including nanoparticles, hydrogels, floating systems, and composite materials. By improving drug retention, enhancing bioavailability, and promoting patient adherence, these materials offer a solid foundation for the development of innovative therapeutic strategies for bladder diseases.