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Prostate cancer (PCa) poses a serious burden to men. Interferon-β (IFN-β) is implicated in cancer cell growth. This study hence explored the regulation of IFN-β-modified human umbilical cord mesenchymal stem cell-derived exosomes (hUCMSC-Exos) in PCa cells.  In vitro- cultured hUCMSCs were transfected with pcDNA3.1-IFN-β plasmid or IFN-β siRNA. hUCMSC-Exos were extracted by ultracentrifugation and identified. PCa cells (PC3 and LNCap) were treated with Exos. Cellular internalization of Exos by cells was detected by uptake assay. Cell proliferation, cycle, and apoptosis were evaluated by CCK-8, EdU staining, and flow cytometry. Levels of cell cycle-related proteins (cyclin D/cyclin E) were determined by Western blot. The effect of IFN-β-modified hUCMSC-Exos  in vivo  was analyzed. IFN-β-modified hUCMSC-Exos (Exo oe-IFN−β  or Exo si-IFN−β ) were successfully isolated. IFN-β was encapsulated in Exos, and PCa cells could uptake Exos. After treating with Exo oe-IFN−β , PCa cell proliferation was impeded, the percentage of cells in the G0/G1 phase, cyclin D/cyclin E levels, and cell apoptotic rate were elevated, while cells treated with Exo oe-IFN−β  exhibited contrary trends. IFN-β-modified hUCMSC-Exos reduced PCa tumor size and weight  in vivo . Conjointly, IFN-β-modified hUCMSC-Exos suppress PCa cell proliferation and facilitate apoptosis.

organogenesis

Regulation of Interferon-β-Modified Human Umbilical Cord Mesenchymal Stem Cell-Derived Exosomes in Proliferation and Apoptosis of Prostate Cancer Cells