Preparation and evaluation of paclitaxel-loaded reactive oxygen species and glutathione redox-responsive poly(lactic-co-glycolic acid) nanoparticles for controlled release in tumor cells

Aim: To formulate and assess the anticancer effect of the poly(lactic-co-glycolic acid) (PLGA) copolymer with the thioether groups (diethyl sulfide [Des]) and disulfide bond (cystamine containing disulfide [Cys]), which encapsulated the anticancer drug paclitaxel (PTX) and triggered PTX release in cancer cell H2O2-rich or glutathione-rich surroundings. 

Methods: PLGA-b-P (Des@Cys) and PLGA-b-P nanoparticles loaded with PTX were prepared and characterized in vitro. The delivery ability of the PLGA-b-P nanoparticles and PLGA-b-P-PTX nanoparticles was assessed on a CT26 (mouse colon cancer cell line) and mouse lung cancer LLC model. 

Results: The nanoparticles were successfully prepared. Compared with free PTX, the formulated PLGA-b-P nanoparticles loaded with PTX exhibited greater accumulation at the tumor site in the mouse model. 

Conclusion: PLGA-b-P nanoparticles promote drug accumulation at tumor sites, providing an effective strategy for an intelligent, responsive drug-delivery system.

Comments：

This study aims to develop a new drug delivery system using a copolymer of poly(lactic-co-glycolic acid) and thioether groups and disulfide bond, which can encapsulate paclitaxel and trigger its release in cancer cells with high levels of H2O2 or glutathione. The results show that the formulated PLGA-b-P nanoparticles loaded with paclitaxel exhibited better accumulation at the tumor site compared to free paclitaxel in a mouse model, providing a promising strategy for an intelligent and responsive drug delivery system.

 

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