Abstract
Tumour-initiating cells (TICs) are rare cancer cells isolated from tumours of different origins including high-grade tumours that sustain neoplasic progression and development of metastatic disease. They harbour deregulated stem cells pathways and exhibit an unchecked ability to self-renew, a property essential for tumour progression. Among the essential factors maintaining embryonic stem (ES) cells properties, OCT-4 (also known as POU5F1) has been detected in tumours of different origins. Although ectopic expression results in dysplasic growth restricted to epithelial tissues, overexpression expands the proportion of immature cells in teratomas. However, OCT-4-expressing cells have not been purified from spontaneously occurring tumours, thus information concerning their properties is rather scant. Here, using p53−/− mice expressing green fluorescent protein and the puromycin resistance gene under the control of the Oct-4 promoter, we show that OCT-4 is expressed in 5% onwards of the undifferentiated tumour cell populations derived from different organs. OCT-4 expression was low as compared with ES cells, but was associated with a ‘stemness’ signature and expression of the chemokine receptor CXCR4. These cells displayed cancer stem cell features, including increased self-renewal and differentiation ability in vitro and in vivo. They not only formed allografts containing immature bone regions but also disseminated into different organs, including lung, liver and bone. Experiments based on RNA interference revealed that Oct-4 expression drives both their engraftment and metastasis formation. This work points out the crucial contribution of Oct-4-expressing TICs in the hierarchical organization of the malignant potential, leading to metastasis formation. Consequently, it provides an appropriate model to develop novel therapies aiming to strike down TICs by targeting self-renewal genes, therefore efficient to reduce tumour growth and metastatic disease.
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Acknowledgements
We are grateful to Professor Austin Smith and Dr Jenny Nichols for generously providing Oct-4-GiP mice and for useful comments. The contributions of Drs Ez-Zoubir Amri and Gilles Pages for in vivo imaging analyses are appreciated. We thank our colleagues, Dr Katrina Podsypanina and Dr Alain Aurias, for helpful suggestions and discussions. We are indebted to Drs Pascal Peraldi, Nathalie Mazure, Jean-François Peyron, Marie-Christine De Vernejoul and Minoo Rassoulzadegan for a careful reading of this manuscript, and to Drs Amanda Patel and Eric Lingueglia for valuable help in editing this manuscript. We acknowledge expert technical assistance of Katia Havet with histology; Agnes Loubat with flow cytometry; Mansour Djedaini with in vivo imaging; Thibault Fabas and Annie-Claude Peyron with genetic analysis; and Franck Paput, Cendrine Dubaud and Jacky Paput with animal care. Our lab receives financial support from Association pour la Recherche contre le Cancer and Institut National du Cancer (grant numbers: CT 30008187 and PL-96-007). We thank Conseil Général des Alpes-Maritimes for financial support for the animal imaging equipment (SkyScan).
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Darini, C., Pisani, D., Hofman, P. et al. Self-renewal gene tracking to identify tumour-initiating cells associated with metastatic potential. Oncogene 31, 2438–2449 (2012). https://doi.org/10.1038/onc.2011.421
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DOI: https://doi.org/10.1038/onc.2011.421
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