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Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression

  • Authors:
    • Fan Lin
    • Hu‑Bin Yin
    • Xin‑Yuan Li
    • Gong‑Min Zhu
    • Wei‑Yang He
    • Xin Gou
  • View Affiliations / Copyright

    Affiliations: Department of Urology, The First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, P.R. China
    Copyright: © Lin et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 151-164
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    Published online on: December 3, 2019
       https://doi.org/10.3892/ijo.2019.4933
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Abstract

Tumour‑associated macrophages (TAMs) compose a major component of the tumour microenvironment and form in this microenvironment prior to cancer metastasis. However, the detailed mechanisms of TAM remodelling in the context of bladder cancer have not been clearly defined. The present study collected exosomes from the conditioned medium of human bladder T24 cancer cells. The effects of macrophages treated with exosomes derived from T24 cells on bladder cancer cell migration and invasion were analysed by Transwell assays. The expression levels of endogenous and exosomal microRNA‑21 (miR‑21) were examined by reverse transcription‑quantitative PCR, while the expression level of the target protein was analysed by western blot analysis. Luciferase reporter plasmids and mutants were used to confirm direct targeting. The effects of miR‑21 on bladder cancer cell migration and invasion were analysed by Transwell and Matrigel assays following miR‑21 transfection. It was identified that exosomes derived from bladder cancer cells polarized THP‑1 cell‑derived macrophages into the M2 phenotype, and TAM‑mediated pro‑migratory and pro‑invasive activity was determined. Moreover, it was found that miR‑21 was highly expressed in exosomes derived from bladder cancer cells as well as in macrophages treated with exosomes. In addition, macrophages transfected with miR‑21 exhibited M2 polarization and promoted T24 cell migratory and invasive ability. Mechanistically, exosomal miR‑21 derived from bladder cancer cells inhibited phosphatase and tensin homolog activation of the PI3K/AKT signalling pathway in macrophages and enhanced STAT3 expression to promote M2 phenotypic polarization. The present results suggest that exosomal miR‑21 can promote cancer progression by polarizing TAMs.
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Copy and paste a formatted citation
Spandidos Publications style
Lin F, Yin HB, Li XY, Zhu GM, He WY and Gou X: Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression. Int J Oncol 56: 151-164, 2020.
APA
Lin, F., Yin, H., Li, X., Zhu, G., He, W., & Gou, X. (2020). Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression. International Journal of Oncology, 56, 151-164. https://doi.org/10.3892/ijo.2019.4933
MLA
Lin, F., Yin, H., Li, X., Zhu, G., He, W., Gou, X."Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression". International Journal of Oncology 56.1 (2020): 151-164.
Chicago
Lin, F., Yin, H., Li, X., Zhu, G., He, W., Gou, X."Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression". International Journal of Oncology 56, no. 1 (2020): 151-164. https://doi.org/10.3892/ijo.2019.4933
Copy and paste a formatted citation
x
Spandidos Publications style
Lin F, Yin HB, Li XY, Zhu GM, He WY and Gou X: Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression. Int J Oncol 56: 151-164, 2020.
APA
Lin, F., Yin, H., Li, X., Zhu, G., He, W., & Gou, X. (2020). Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression. International Journal of Oncology, 56, 151-164. https://doi.org/10.3892/ijo.2019.4933
MLA
Lin, F., Yin, H., Li, X., Zhu, G., He, W., Gou, X."Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression". International Journal of Oncology 56.1 (2020): 151-164.
Chicago
Lin, F., Yin, H., Li, X., Zhu, G., He, W., Gou, X."Bladder cancer cell‑secreted exosomal miR‑21 activates the PI3K/AKT pathway in macrophages to promote cancer progression". International Journal of Oncology 56, no. 1 (2020): 151-164. https://doi.org/10.3892/ijo.2019.4933
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