Charge-Conversional Binary Drug Delivery Polymeric Micelles for Combined Chemotherapy of Cervical Cancer

Candesartan-g-polyethyleneimine-cis-1,2-cyclohexanedicarboxylic anhydride (CD-g-PEI-HHPA, CPH) polymer-drug conjugates based on charge-conversional delivery, enhanced buffering capacity, amidase-triggered drug release, and combined cancer chemotherapy strategies were successfully synthesized for simultaneous and effective codelivery of CD and paclitaxel (PTX) to treat cervical cancer. The CPH polymer-drug conjugates could self-assemble into core-shell structure micelle of around 100 nm in diameter with negative surface charge and were employed to load PTX to formulate binary drug delivery system. The CPH polymeric micelles could mediate quick endosomal escape and amidase-responsive drug-release manners. In vitro cytotoxicity and in vivo investigations confirmed CPH binary drug delivery system exerted strong antitumor efficacy.