Embryonic Stem Cells‐Derived Exosomes Endowed with Targeting Properties as Chemotherapeutics Delivery Vehicles for Glioblastoma Therapy

Exosomes are nanosized membrane vesicles (30–100 nm) that can easily penetrate the blood–brain barrier, safely deliver therapeutic drugs, and be modified with target ligands. Embryonic stem cells (ESCs) provide abundant exosome sources for clinical application due to their almost unlimited self‐renewal. Previous studies show that exosomes secreted by ESCs (ESC‐exos) have antitumor properties. However, it is not known whether ESC‐exos inhibit glioblastoma (GBM) growth. In this study, the anti‐GBM effect of ESC‐exos is confirmed and then c(RGDyK)‐modified and paclitaxel (PTX)‐loaded ESC‐exos, named cRGD‐Exo‐PTX are prepared. It is then investigated whether the engineered exosomes deliver more efficiently to GBM cells versus free drug alone and drug‐loaded ESC‐exos using an in vitro GBM model and in vivo subcutaneous and orthotopic xenografts model. The results show that cRGD‐Exo‐PTX significantly improves the curative effects of PTX in GBM via enhanced targeting. These data indicate that ESC‐exos are potentially powerful therapeutic carriers for GBM and could have utility in many other diseases.