Abstract
Small cell lung cancer (SCLC) is an aggressive neuroendocrine cancer characterized by loss of function TP53 and RB1 mutations in addition to mutations in other oncogenes including MYC. Overexpression of MYC together with Trp53 and Rb1 loss in pulmonary neuroendocrine cells of the mouse lung drives an aggressive neuroendocrine low variant subtype of SCLC. However, the transforming potential of MYC amplification alone on airway epithelium is unclear. Therefore, we selectively and conditionally overexpressed MYC stochastically throughout the airway or specifically in neuroendocrine, club, or alveolar type II cells in the adult mouse lung. We observed that MYC overexpression induced carcinoma in situ which did not progress to invasive disease. The formation of adenoma or SCLC carcinoma in situ was dependent on the cell of origin. In contrast, MYC overexpression combined with conditional deletion of both Trp53 and Rb1 exclusively gave rise to SCLC, irrespective of the cell lineage of origin. However, cell of origin influenced disease latency, metastatic potential, and the transcriptional profile of the SCLC phenotype. Together this reveals that MYC overexpression alone provides a proliferative advantage but when combined with deletion of Trp53 and Rb1 it facilitates the formation of aggressive SCLC from multiple cell lineages.
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Acknowledgements
The authors thank Dr. Kate Sutherland for Ad5-Cre viruses and helpful discussions. We thank the Monash Health Translational Precinct Histology Platform, Monash MicroImaging, Monash Medical Center Animal Facility, Monash Health Translational Precinct Flow Cytometry Core, Monash Biomedical Imaging, Beijing Genomics Institute (BGI) and the Monash Bioinformatics Platform for providing core and technical services.
Funding
This work was supported by the Operational Infrastructure Support Program by the Victorian Government of Australia. D.J. Gough is supported by a Victorian Cancer Agency Mid-Career Fellowship (MCRF19033) and a grant in aid from the Cancer Council of Victoria (GNT1140528).
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Study conception and design DJG. Experiments and Data Analysis: all authors, Manuscript writing DJG and JC, manuscript editing all authors.
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Chen, J., Guanizo, A., Luong, Q. et al. Lineage-restricted neoplasia driven by Myc defaults to small cell lung cancer when combined with loss of p53 and Rb in the airway epithelium. Oncogene 41, 138–145 (2022). https://doi.org/10.1038/s41388-021-02070-3
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DOI: https://doi.org/10.1038/s41388-021-02070-3
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