Abstract
Ovarian carcinoma inherently possesses a distinct metastatic organotropism for the adipose-rich omentum, contributing to disease progression. Although the premetastatic microenvironment (PMM) has been known to often play a prometastatic role during the process, incomplete mechanistic insight into PMM formation has prevented its therapeutic targeting. Omental fibroblasts can be activated by tumour cells to differentiate into myofibroblasts, termed the fibroblast-to-myofibroblast transition (FMT), which, in turn, enhances cancer aggressiveness. Here, we report crosstalk between cancer cells and omental fibroblasts through exosomal piR-25783, which fuels tumour metastasis. Tumour cell-secreted exosomal piR-25783 activates the TGF-β/SMAD2/SMAD3 pathway in fibroblasts and promotes the FMT in the omentum along with the secretion of various cytokines and elevation of proliferative, migratory, and invasive properties, contributing to the formation of PMMs. Furthermore, piR-25783-induced myofibroblasts promote tumour implantation and growth in the omentum. In addition, the overexpression of piR-25783 in ovarian carcinoma is associated with unfavourable clinicopathological characteristics and shorter survival. In this study, we provide molecular, functional, and translational evidence suggesting that exosomal piR-25783 plays an important role in the formation of PMMs and the development of metastatic diseases in vitro and in vivo and may serve as a potential therapeutic target for ovarian carcinoma with metastasis.
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Data availability
The datasets generated and/or analysed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 81772781, 81903012, 81902665). The authors acknowledge the use of Biorender that is used to create Graphical Abstract.
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ZW and LX conceived the project. GL and XY conducted most of the experimental work and wrote the manuscript. SD and LG performed the animal experiments. SS and LC collected the clinical samples. QW and YC analysed the clinical data. JC supervised the project. All authors read and approved the final manuscript.
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All procedures involving human specimens were approved by the Ethics Committee of Tongji Medical College, Huazhong University of Science and Technology (Wuhan, China). Written informed consent was obtained from all patients. All experimental procedures used in the animal studies were approved by the Tongji Medical College’s Animal Care and Use Committee, Huazhong University of Science and Technology.
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Li, G., Yi, X., Du, S. et al. Tumour-derived exosomal piR-25783 promotes omental metastasis of ovarian carcinoma by inducing the fibroblast to myofibroblast transition. Oncogene 42, 421–433 (2023). https://doi.org/10.1038/s41388-022-02560-y
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DOI: https://doi.org/10.1038/s41388-022-02560-y
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