Abstract
Despite their rarity, PIK3CA mutations in meningiomas have raised interest as potentially targetable, ubiquitous mutations owing to their presence in sporadic benign and malignant tumors but also in hormone-related cases. Using new genetically engineered mouse models, we here demonstrate that Pik3ca mutations in postnatal meningeal cells are sufficient to promote meningioma formation but also tumor progression in mice. Conversely, hormone impregnation, whether alone or in association with Pik3ca and Nf2 mutations, fails to induce meningioma tumorigenesis while promoting breast tumor formation. We then confirm in vitro the effect of Pik3ca mutations but not hormone impregnation on the proliferation of primary cultures of mouse meningeal cells. Finally, we show by exome analysis of breast tumors and meninges that hormone impregnation promotes breast tumor formation without additional somatic oncogenic mutation but is associated with an increased mutational burden on Pik3ca-mutant background. Taken together, these results tend to suggest a prominent role of Pik3ca mutations over hormone impregnation in meningioma tumorigenesis, the exact effect of the latter is still to be discovered.
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All data supporting the findings of this study are available within the paper and its Supplementary Information.
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Acknowledgements
We would like to thank the ICMice for their help in mouse handling and husbandry, the iGenSaq platform for exome analysis and especially Agnes Rastetter for libraries prep and sequencing, the Histomics platform, and gratefully acknowledge Gareau Thomas at ICM Data Analysis Core for the bioinformatics analysis.
Funding
This work was supported by a grant from the Fondation ARC (PJA 20171206327) to MP and a grant from Fondation de France-ANR to MK. PCC was funded by a grant from Fondation ARC (M2R20180507186). TLV was funded by a grant from Dijon University.
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MP was responsible for designing the study, conducting the experiments, interpreting results, and writing the first and final versions of the manuscript. PCC, TLV, ST, SH, SAJ, QV, PM, JB, AB, YT, and YD performed the experiments and interpreted the results. FB provided feedback and expertise on pathological analysis. MK contributed to the study design and critically reviewed the manuscript.
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Cômes, PC., Le Van, T., Tran, S. et al. Respective roles of Pik3ca mutations and cyproterone acetate impregnation in mouse meningioma tumorigenesis. Cancer Gene Ther 30, 1114–1123 (2023). https://doi.org/10.1038/s41417-023-00621-2
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DOI: https://doi.org/10.1038/s41417-023-00621-2