Abstract
Background
Exosomes (Exos) can safely and effectively deliver therapeutic substances to glioma cells; however, their blood–brain barrier (BBB) crossing capacity remains limited. Focused ultrasound (FUS) can transiently, reversibly, and locally open the BBB, while the effects of FUS combined with Exos-miRNA on the treatment of glioma have not been explored to date.
Methods
Exos were extracted by differential centrifugation and the efficacy of miR-1208-loaded Exos combined with FUS in the treatment of glioma was detected by CCK-8, colony formation, flow cytometry, transwell and tumour xenografts assays. The METTL3-mediated regulation of IGF2BP2 on mRNA stability of NUP214 was determined by MeRIP-qPCR, half-life and RIP assays.
Results
We used Exos secreted by mesenchymal stem cells as carriers for the tumour suppressor gene miR-1208, and following FUS irradiation, more Exos carrying miR-1208 were allowed to pass through the BBB, and the uptake of miR-1208 in Exos by glioma cells was promoted, thereby achieving high-efficiency tumour-suppressive effects. Furthermore, the molecular mechanism underlying this effect was elucidated that miR-1208 downregulated the m6A methylation level of NUP214 mRNA by negatively regulating the expression of METTL3, thereby NUP214 expression and TGF-β pathway activity were suppressed.
Conclusions
MiR-1208-loaded Exos combined with FUS is expected to become an effective glioma treatment and deserves further clinical evaluation.
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Data availability
The datasets used and analysed during the current study are available from the corresponding author upon reasonable request.
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Funding
This work is supported by grants from the Natural Science Foundation of China (81571686), Natural Science Foundation of Liaoning Province (2020-MS-170), Basic Scientific Research Project of Colleges and Universities of Liaoning Province (LJKMZ20221148), Science and Technology Plan of Shenyang City (22-321-33-18) and Outstanding Scientific Research Talent Plan of Shengjing hospital (No. 2020M0322).
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WR contributed to the experiment design and implementation, manuscript draft, and data analysis. YZ contributed to the experiment implementation and data analysis. YS, WQ, BY, LJ, PS and LS performed the experiments. ZL, WZ, XW, and XY analysed the data. YZ, YS and ZL conceived or designed the experiments, performed the experiments and wrote the manuscript. All authors read and approved the final manuscript.
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All clinical specimens used in this study were approved by the Ethics Committee of the Shengjing Hospital of China Medical University. All animal experiments were approved by the Laboratory Animal Management Committee of Shengjing Hospital of China Medical University.
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Zhan, Y., Song, Y., Qiao, W. et al. Focused ultrasound combined with miR-1208-equipped exosomes inhibits malignant progression of glioma. Br J Cancer 129, 1083–1094 (2023). https://doi.org/10.1038/s41416-023-02393-w
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DOI: https://doi.org/10.1038/s41416-023-02393-w
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