Abstract
Cancer-associated fibroblasts (CAF) are important constituents of the tumor microenvironment (TME) and are major drivers of tumorigenesis. Yet, therapies aiming at eliminating CAF have failed to cure patients. This setback has raised questions regarding whether CAF exclusively favour cancer progression, or if they may also assume tumor-suppressor functions. In the present study, we used proteomics and single cell RNA-sequencing analysis to examine the CAF landscape in hepatocellular carcinoma (HCC). We thereby unveil three major CAF populations in HCC, one of which specifically expressing the prolargin protein. This CAF subpopulation (further termed as CAF_Port) shared a strong transcriptomic signature with portal liver fibroblasts. We further show that CAF_Port deposit prolargin in the TME and that its levels are lower in tumors as compared to the peritumoral region. Mechanistically, aggressive cancer cells degraded prolargin using matrix metalloprotease activity. Survival analysis of 188 patients revealed that high prolargin protein levels correlate with good patient outcome (HR = 0.37; p = 0.01). In vivo, co-injection of cancer cells with fibroblasts silenced for prolargin, led to faster tumor development (5-fold; p = 0.01), mainly due to stronger angiogenesis. Using protein-protein interaction study and structural modelling, we further demonstrate that prolargin binds and inhibits the activity of several pro-agiogenic proteins, including hepatocyte and fibroblast growth factors. In conclusion, prolargin is angiogenesis modulator and CAF-derived tumor suppressor in HCC. Stabilizing prolargin levels in the CAF_Port subpopulation may revert their tumor-antagonizing properties, warranting exploration in further pre-clinical studies.
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Acknowledgements
The authors acknowledge the experimental support of Naima Maloujahmoum (Metastasis Research Laboratory, University of Liege), Susumu Rokudai (Department of Molecular Pharmacology and Oncology, Gunma University), and Tadashi Handa (Pathology Dept. Gunma University). The authors are particularly thankful to Arnaud Blomme (Metastasis Research Laboratory, University of Liege) and Touko Hirano (Laboratory for Analytical Instruments, Gunma University Graduate School of Medicine) for the help concerning the MS analysis of patient material. The authors thank the Small Animal Imaging Platform of Montpellier (IPAM, http://www.ipam.cnrs.fr/) for the help with animal experiments. AT is thankful to Jacques Colinge (Bioinformatics and Systems Biology group, IRCM, Montpellier) for his R teachings and to Peter Friedl (The University of Texas MD Anderson Cancer Center, Houston, Texas, USA) for the helpful discussions. This work was supported with grants from the University of Liège, National Fund for Scientific Research (FNRS), Gunma University (GIAR Research Program for Omics-Based Medical Science). BC is supported by a Fondation de France grant (No. 00078461). RR is supported by Associazione Italiana per la Ricerca sul Cancro (AIRC), grant number MFAG 18459 and IG 2019 - ID. 23151; SR is supported by Fondazione Umberto Veronesi fellowship. AT is a senior research fellow of the French National Institute of Health and Medical Research (INSERM) and is supported by LabEx MabImprove Starting Grant. OD is supported by a grant from the “Fondation Contre le Cancer”. No funding bodies had any role in study design, data collection and analysis, decision to publish, or preparation of the paper.
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Study concept and design: AT and MN; drafting of the paper: AT, MN, BC; data acquisition and evaluation: BC, RR, YO, SR, TY, PC, RS, and ET; bioinformatics analysis: AT; structure analysis and docking: RBS; statistical analysis: BC, RR, YO; provided human clinical samples: SG, OD, TO, and PD; evaluation of pathology/histology: DP, GF, LK, TO, and PD; critical revision of the paper for important intellectual content: AB, AM, VC, MN, and AT; obtained funding: VC, MN, and AT; study supervision: AT.
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Chiavarina, B., Ronca, R., Otaka, Y. et al. Fibroblast-derived prolargin is a tumor suppressor in hepatocellular carcinoma. Oncogene 41, 1410–1420 (2022). https://doi.org/10.1038/s41388-021-02171-z
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DOI: https://doi.org/10.1038/s41388-021-02171-z
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