Background/Objectives: Extracellular vesicles (EVs) are involved in cell-to-cell communication and delivery of signaling molecules and represent an interesting approach in targeted therapy. This project focused on EV-mediated facilitation and cell-specific delivery of effector antimiR molecules carried by biologically produced gold nanoparticles (AuNPs). Methods: First, we loaded EVs derived from cancer cells 4T1 with AuNPs-antimiR. The AuNPs were also decorated with or without transferrin (Tf) molecules. We examined parental cell-specific delivery of the AuNPs-Tf-antimiR within monocultures as well as co-cultures in vitro. Subsequently, we used autologous EVs containing AuNPs-Tf-antimiR to target tumor cells in a xenograft tumor model in vivo. Efficacy of the antimir transfer was assessed by qPCR and apoptosis assessment. Results: In vitro, EVs loaded with AuNPs-antimiR were internalized only by the parental cells and the AuNPs-antimiR transfer was successful and effective only in EVs that were decorated with Tf. We achieved effective delivery of the antimiR molecule into cancer cells in vivo, which was proved by specific silencing of the target oncogenic miRNA as well as induction of cancer cells apoptosis. Conclusions: EVs represent an interesting and potent way for targeted cargo delivery and personalized medicine. On the other hand, there are various safety and efficacy challenges that remain to be addressed.

Department of Chemistry University of Wyoming 1000 E University Ave Laramie WY 82071 USA

Department of Medical Sciences Nanoparticle Research Center in Medicine Sha C Islamic Azad University Shahrood 36199 43189 Iran

Department of Medical Sciences Sha C Islamic Azad University Shahrood 36199 43189 Iran

Faculty of Health Studies Technical University of Liberec 460 01 Liberec Czech Republic

Institute of Analytical Chemistry Czech Academy of Sciences 602 00 Brno Czech Republic

Institute of Microbiology Czech Academy of Sciences 142 20 Prague Czech Republic

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