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Adult interfollicular tumour-initiating cells are reprogrammed into an embryonic hair follicle progenitor-like fate during basal cell carcinoma initiation

Abstract

Basal cell carcinoma, the most frequent human skin cancer, arises from activating hedgehog (HH) pathway mutations; however, little is known about the temporal changes that occur in tumour-initiating cells from the first oncogenic hit to the development of invasive cancer. Using an inducible mouse model enabling the expression of a constitutively active Smoothened mutant (SmoM2) in the adult epidermis, we carried out transcriptional profiling of SmoM2-expressing cells at different times during cancer initiation. We found that tumour-initiating cells are massively reprogrammed into a fate resembling that of embryonic hair follicle progenitors (EHFPs). Wnt/ β-catenin signalling was very rapidly activated following SmoM2 expression in adult epidermis and coincided with the expression of EHFP markers. Deletion of β-catenin in adult SmoM2-expressing cells prevents EHFP reprogramming and tumour initiation. Finally, human basal cell carcinomas also express genes of the Wnt signalling and EHFP signatures.

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Figure 1: Transcriptional analysis of FACS-isolated SmoM2-expressing cells at different times following oncogene expression.
Figure 2: Reprogramming of adult interfollicular cells into EHFPs following SmoM2 expression.
Figure 3: Reprogramming of adult interfollicular cells into EHFPs following Ptch1 deletion from the hairless paw epidermis.
Figure 4: Wnt/ β-catenin signalling is rapidly activated in adult interfollicular cells following SmoM2 expression.
Figure 5: SmoM2 expression in embryonic epidermis accelerates BCC formation and promotes Wnt/ β-catenin signalling activation in the epidermis and its underlying dermis.
Figure 6: Cell-autonomous functions of Wnt/ β-catenin during SmoM2-induced embryonic hair follicle reprogramming.
Figure 7: Cell-autonomous role of Wnt/ β-catenin in SmoM2-induced tumorigenesis and pharmacological inhibition of tumour initiation in the adult epidermis.
Figure 8: Human BCCs express markers of the Wnt/ β-catenin and EHFP signatures.

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Acknowledgements

We would like to thank those who provided us with reagents and who are acknowledged in the text. C.B. is an investigator of WELBIO. C.B. is a chercheur qualifié, S.B. is a chargé de recherche and G.L. is a collaborateur scientifique of the FRS/FNRS; K.K.Y. is supported by TELEVIE. This work was supported by the FNRS, the program d’excellence CIBLES of the Wallonia Region, a research grant from the Fondation Contre le Cancer, the Fondation ULB, the Fond Yvonne Boël and the Fond Gaston Ithier, a starting grant of the European Research Council (ERC) and the EMBO Young Investigator Program.

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C.B. and K.K.Y. designed the experiments and carried out the data analysis; K.K.Y., G.L., K.B., O.A., J.C.L., V.S., B.V.S., S.D., S.A. and D.P. carried out most of the experiments; S.B. carried out bioinformatic analysis of the microarray; S.R. and I.S. carried out immunohistochemistry analysis on human BCCs; J.V.B. and V.D.M. provided human biopsy materials; C.B. and K.K.Y. wrote the manuscript.

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Correspondence to Cédric Blanpain.

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Youssef, K., Lapouge, G., Bouvrée, K. et al. Adult interfollicular tumour-initiating cells are reprogrammed into an embryonic hair follicle progenitor-like fate during basal cell carcinoma initiation. Nat Cell Biol 14, 1282–1294 (2012). https://doi.org/10.1038/ncb2628

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