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miR-21a in exosomes from Lewis lung carcinoma cells accelerates tumor growth through targeting PDCD4 to enhance expansion of myeloid-derived suppressor cells

Oncogene volume 39, pages 6354–6369 (2020)Cite this article

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Abstract

In patients with lung cancer, myeloid-derived suppressor cells (MDSCs) have been reported to be significantly increased. Tumor-derived exosomes (TDEs) from various cancers played a critical role in MDSC induction. However, studies on the molecular mechanism underlying MDSC expansion induced by exosomes from lung cancer cells are still limited. In this study, we demonstrated that LLC-Exo accelerated tumor growth along with a significant accumulation of MDSCs in mouse tumor model. miRNA profiling showed that miR-21a was enriched in LLC-Exo. The depletion of miR-21a in LLC-Exo leads to the loss of their ability to induce MDSC expansion. Further results showed that miR-21a of LLC-Exo induced MDSC expansion via downregulation of the programmed cell death protein 4 (PDCD4) protein. The results of gain-and loss-of-function experiments validated that PDCD4 function as a critical inhibitor to negatively regulate expansion of MDSCs via inhibition Il-6 production in bone marrow cells. In addition, our data showed that exosomes derived from human lung cancer cell lines expressing miR-21a, also induced expansion of MDSCs in human CD14+ monocytes in vitro. Overall, our results demonstrated that miR-21a enriched in lung carcinoma cell-derived exosomes could promote functional expansion of MDSCs through targeting PDCD4.

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Fig. 1: LLC-Exo promote tumor growth in mice.
Fig. 2: LLC-Exo promote expansion and activation of MDSCs.
Fig. 3: MiRNA-21a from LLC-Exo enhanced the expansion of MDSCs.
Fig. 4: MiR-21a down-regulates PDCD4 protein via binding to the 3′-UTR of PDCD4 mRNA.
Fig. 5: LLC-Exo promote expansion of MDSCs by targeting PDCD4.
Fig. 6: LLC-Exo promote MDSC expansion via activation of IL-6/pSTAT3 pathway.
Fig. 7: PDCD4 inhibits MDSCs expansion through down-regulating IL-6/pSTAT3 pathway activation.
Fig. 8: Exosomes derived from human lung cancer cell lines trigger expansion of human MDSCs.

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Acknowledgements

This work was supported by grants from the Natural Science Foundation of Shenzhen (KQJSCX20180328094239048) of Shan Jiang, National Key Research and Development Program of China (2016YFA0502201) of Ying, Wan and Scientific Research Foundation for Introduced High-level Personnel in Chongqing Medical University of Bin Xiao (41021300160256).

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  1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Xingju Zhang & Ying Tang

  2. Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, China

    Xingju Zhang, Ying Tang & Shan Jiang

  3. Biomedical Analysis Center, Army Medical University, Chongqing, 400038, China

    Fei Li & Ying Wan

  4. Department of Oncology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China

    Qinglan Ren

  5. College of Pharmacy, Chongqing Medical University, Chongqing, 400016, China

    Bin Xiao

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Zhang, X., Li, F., Tang, Y. et al. miR-21a in exosomes from Lewis lung carcinoma cells accelerates tumor growth through targeting PDCD4 to enhance expansion of myeloid-derived suppressor cells. Oncogene 39, 6354–6369 (2020). https://doi.org/10.1038/s41388-020-01406-9

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