R11 modified tumor cell membrane nanovesicle-camouflaged nanoparticles with enhanced targeting and mucus-penetrating efficiency for intravesical chemotherapy for bladder cancer.

Intravesical chemotherapy is generally used in the clinic for treating bladder cancer (BCa), but its efficacy is limited due to the permeation barrier and side effects caused by the off-targeting of normal urothelial cells. In this study, BCa cell-derived membrane nanovesicles were used as drug carriers, and their homologous tumor-targeting capacity was utilized. A BCa-targeting hendeca-arginine peptide was functionalized onto the nanovesicles to impart a mucus-penetrating ability and thus overcome the permeation barrier. The tumor-targeting and mucus-penetrating nanovesicles were stable in urine, were highly permeable to the glycosaminoglycan layer, and specifically targeted BCa. The vesicles were internalized through caveolin-mediated endocytosis, were transported to nonlysosome-localized intracellular regions, and efficiently infiltrated bladder tumor spheroids. In in vivo intravesical chemotherapy, the nanovesicles achieved chemo-resection in murine orthotopic BCa models. This BCa-targeting and mucus-penetrating drug delivery system may be promising for the intravesical chemotherapy of BCa.