Abstract
High mortality rate and poor survival in melanoma are associated with efficient metastatic colonization. The underlying mechanisms remain elusive. Elucidating the role of exosomes in mediating the interactions between cancer cells and the metastatic microenvironment has been focused on cancer cell derived exosomes in modulating the functions of stromal cells. Whether cancer stem cells (CSCs) can modify the metastatic properties of non-CSC cells, and whether exosomal crosstalk plays a role have not been demonstrated prior to this report. In this study, a paired M14 melanoma derivative cell line, i.e., melanoma parental cell (MPC) and its CSC derivative cell line melanoma stem cell (MSC) were employed. We demonstrated that exosomal crosstalk betwen MSCs and non-CSC MPCs is a new mechanism that underlies melanoma metastasis. Low metastatic melanoma cells (MPCs) can acquire the “metastatic power” from highly metastatic melanoma CSCs (MSCs). We illustrated an uncharacterized microRNA, miR-4535 in mediating such exosomal crosstalk. MSCs deliver its exosomal miR-4535 to the targeted MPCs. Upon entering MPCs, miR-4535 augments metastatic colonization of MPCs by inactivating the autophagy pathway.
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The data used to support the findings of this study are available from every author upon request.
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Acknowledgments
I would like to thank all the students in the lab for their help and the members of the research group for their efforts. I would also like to thank my advisors for their guidance. In addition, thanks for the funding supports of the National Natural Science Fund (Grant No. 82073277 and 82173247), the Science and Technology Project Affiliated to the Education Department of Chongqing (Grant No. KJQN202100404), Natural Science Fund of Chongqing (Grant No. cstc2019jcyj-msxmX0868) and Science and Technology Project of Chongqing Yuzhong District (Grant No. 20200110).
Funding
This work was supported by the National Natural Science Fund (Grant No. 82073277 and 82173247), the Science and Technology Project Affiliated to the Education Department of Chongqing (Grant No. KJQN202100404), Natural Science Fund of Chongqing (Grant No. cstc2019jcyj-msxmX0868) and Science and Technology Project of Chongqing Yuzhong District (Grant No. 20200110).
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Doudou Liu and Xiaoshuang Li completed the molecular experiment, Bin Zeng and Qiting Zhao completed the animal experiment, Hao Chen was responsible for exosome extraction, Yuhan Zhang and Yuting Chen completed the analysis of sequencing data. Doudou Liu wrote the article, Jianyu Wang and H. Rosie Xing were responsible for the overall design of this study and the revision and improvement of the manuscript.
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All animal work was conducted in accordance with an approved protocol and carried out in accordance with the institutional animal welfare guidelines of the Chongqing Medical University. The license number of experimental animal is SYXK2018–0003.
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Supplementary Information
Supplementary Figure 1
A. Efficiency of transfection of miR-4535 mimics into MSC exosomes by electroporation, **refers to p < 0.01. B. Expression of miR-4535 in MPC cells was increased after MPC cells co-cultured with MSC exosomes that overexpressed miR-4535, *refers to p < 0.05. C-D. Overexpression of miR-4535 in MSC exosomes promoted the migration (C) and invasion (D) of MPC cells, the bar is 210 μm, **refers to p < 0.01. E. The level of miR-4535 in MSC exosomes was increased when miR-4535 was overexpressed in MSC cells, ***refers to p < 0.001. F. After overexpression of miR-4535 in MSC cells, MSC exosomes were co-cultured with MPC, and the expression of miR-4535 in MPC was also increased, *refers to p < 0.05. G-H. After miR-4535 overexpression in MSC cells, MSC exosomes promoted the migration (G) and invasion (H) of MPC cells, the bar is 210 μm, ***refers to p < 0.001. I. After inhibiting the expression of miR-4535 in MSC cells with the inhibitor, the level of miR-4535 in exosomes was also decreased, ***refers to p < 0.001. (PNG 2269 kb)
Supplementary Figure 2
A. Predicted binding site and score of miRNA-4535 and ATG13 in TargetScan. B. Predicted binding sites and mutation sites of miRNA-4535 and ATG13. C. Relative luciferase activities were analyzed in 293 T cells co-transfected with ATG13 3 ′ -UTR (wild type or mutant) reporter plasmid, and microRNA 4535 mimic or NC mimics. (PNG 475 kb)
Supplementary Figure 3
A. Assessment of the stemness of MSC cells by the spheroid formation ability of 1000 cells in a 6-well plate. The scale bar is 300 μm. B. Assessment of the stemness of MSC cells by single cell cloning rate in 96-well plates after the expression of miRNA 4535 was inhibited in MSC cells. C. The expression of stemness genes after the expression of miRNA 4535 was inhibited in MSC cells. ***refers to P < 0.001 and **refers to p < 0.01. (PNG 1728 kb)
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Liu, D., Li, X., Zeng, B. et al. Exosomal microRNA-4535 of Melanoma Stem Cells Promotes Metastasis by Inhibiting Autophagy Pathway. Stem Cell Rev and Rep 19, 155–169 (2023). https://doi.org/10.1007/s12015-022-10358-4
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DOI: https://doi.org/10.1007/s12015-022-10358-4