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VEGFR affects miR-3200-3p-mediated regulatory T cell senescence in tumour-derived exosomes in non-small cell lung cancer

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Abstract

Numerous studies have demonstrated that regulatory T (Treg) cells play an important role in the tumour microenvironment (TME). The aim of this study was to investigate whether VEGFR2 affects the expression of miR-3200-3p in exosomes secreted by tumour cells, thereby influencing Treg senescence in the TME. The results showed that VEGFR2 expression level was the highest in Calu-1 cells, and after transfection with si-VEGFR2, the exosomes secreted from Calu-1 cells were extracted and characterised with no significant difference from the exosomes of the untransfected group, but the expression of miR-3200-3p in the exosomes of the transfected si-VEGFR2 group was elevated. The Cell Counting Kit-8 (CCK-8) and flow cytometry (FCM) results suggested that exosomes highly expressing miR-3200-3p could inhibit Treg cell viability and promote apoptosis levels when treated with Treg cells. Detection of the senescence-associated proteins p16 INK4A and MMP3 by western blot (WB) revealed that exosomes highly expressing miR-3200-3p were able to elevate their protein expression levels. Tumour xenograft experiments demonstrated that exosomes with high miR-3200-3p expression promoted Treg cell senescence and inhibited subcutaneous tumour growth in nude mice. Dual-luciferase reporter assays and RNA pull-down assays showed that miR-3200-3p could be linked with DDB1. Overexpression of DDB1 reverses changes in DCAF1/GSTP1/ROS protein expression caused by exosomes with high miR-3200-3p expression. In conclusion, inhibition of VEGFR2 expression in tumour cells promotes the expression of miR-3200-3p in exosomes secreted by tumour cells. miR-3200-3p enters the TME through exosomes and acts on DDB1 in Treg cells to promote senescence of Treg cells to inhibit tumour progression.

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Data availability

The dataset used and/or analysed in this study is available from the corresponding author on reasonable request.

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Funding

This work was supported by Xuzhou Medical University Affiliated Hospital Science and Technology Development Fund (XYFM2021047).

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Contributions

XJ designed the study. KH, CD, and CH carried out the experiment and wrote the paper. KH and DY analysed the data and discussed the result. JL, KH, and XJ revised the manuscript.

Corresponding author

Correspondence to Xiaodong Jiang.

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Ethics Approval and Consent to participate

The study protocol was proved by the Animal Ethics Committee of The Affiliated Lianyungang Hospital of Xuzhou Medical University. No patients were involved in this study.

Animal ethics

The experimental procedure followed the United States National Institutes of Health Guide for the Care and Use of Laboratory Animals (NIH Publication No. 85-23, revised 1985). The study protocol was approved by the Animal Ethics Committee of The Affiliated Lianyungang Hospital of Xuzhou Medical University

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The authors declare no competing interests.

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Hui, K., Dong, C., Hu, C. et al. VEGFR affects miR-3200-3p-mediated regulatory T cell senescence in tumour-derived exosomes in non-small cell lung cancer. Funct Integr Genomics 24, 31 (2024). https://doi.org/10.1007/s10142-024-01305-2

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  • DOI: https://doi.org/10.1007/s10142-024-01305-2

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