Challenges associated with low-drug-loading capacity, lack of active targeting of
tumor cells and unspecific drug release of nanocarriers synchronously
plague the success of
cancer therapy. Herein, we constructed active-targeting, redox-activated polymeric
micelles (HPGssML) self-assembled aptamer-decorated, amphiphilic biodegradable poly (benzyl malolactonate-co-ε-
caprolactone) copolymer with
disulfide linkage and π-conjugated moieties. HPGssML with a homogenous spherical shape and nanosized diameter (∼150 nm) formed a low critical micellar concentration (10-3 mg/mL), suggesting good stability of polymeric
micelles. The anticancer drug,
doxorubicin (DOX), can be efficiently loaded into the core of
micelles with high-drug-loading content via strong π-π interaction, which was verified by a decrease in fluorescence intensity and redshift in UV adsorption of DOX in
micelles. The redox sensitivity of polymeric
micelles was confirmed by size change and in vitro drug release in a reducing environment. Confocal microscopy and flow cytometry assay demonstrated that conjugating aptamers could enhance specific uptake of HPGssML by
cancer cells. An in vitro cytotoxicity study showed that the half-maximal inhibitory concentration (IC50) of DOX-loaded HPGssML was two times lower than that of the control group, demonstrating improved antitumor efficacy. Therefore, the multifunctional biodegradable polymeric
micelles can be exploited as a desirable
drug carrier for effective
cancer treatment.