RESUMO
Objective To prepare a red blood cells based multifunctional nanoscaled drug delivery system,and to study its in vitro photothermal and photodynamic effects.Methods The indocyanine green (ICG)/doxorubicin (DOX) co-loaded nanoscaled red blood cells (DIRAs) were prepared using an extrusion method.The morphology,particle size,encapsulation efficiency,and stability were determined.The heating related change of particle size was studied using a size and potential tester.The in vitro photothermal effect was studied using an infrared imaging device.The uptake of DIRAs to 4T1 cells was studied using a CLSM examination.The in vitro photodynamic effect was studied using a fluorescence probe and CLSM examination.Results DIRAs were successfully prepared with a uniform and homogeneous size which was about (97.0±20.1) nm.The Zeta potential was about-21.6 mV and the encapsulation efficiency of ICG and DOX were 93.5％ and 95.2％,respectively.The DIRAs had excellent stability within 28 days.This nanoscaled drug delivery system had identical photothermal effect compared to free ICG.The cellular uptake of DOX was significantly improved after the laser irradiation and the photodynamic effect was enhanced.Conclusions The prepared DIRAs have regular shape,suitable particle size,high encapsulation efficiency and high photothermal conversion efficiency.DIRAs can improve the cellular uptake of DOX and enhance the photodynamic efficiency.This biomimetic muhifunctional nano-system could facilitate breast cancer treatment by combining PTT7PDT and chemotherapy.