Journal
GENES & DEVELOPMENT
Volume 30, Issue 11, Pages 1289-1299Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.279307.116
Keywords
oncogene; progression; neuroendocrine; transcription factor; ribosome biogenesis
Categories
Funding
- University of Virginia Cancer Center (National Cancer Institute P30 Center Grant) [P30CA044579]
- Fred Hutchinson Cancer Research Center Histology Core and Genomics Core
- Uniting Against Lung Cancer Investigator grant [UALC-13-15]
- American Cancer Society [RSG-15-066-01-TBG]
- National Cancer Institute [R01CA194461, R01CA181449, R01CA148867, RO1CA20525]
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Small cell lung cancer (SCLC) is a devastating neuroendocrine carcinoma. MYCL (L-Myc) is frequently amplified in human SCLC, but its roles in SCLC progression are poorly understood. We isolated preneoplastic neuroendocrine cells from a mouse model of SCLC and found that ectopic expression of L-Myc, c-Myc, or N-Myc conferred tumor-forming capacity. We focused on L-Myc, which promoted pre-rRNA synthesis and transcriptional programs associated with ribosomal biogenesis. Deletion of Mycl in two genetically engineered models of SCLC resulted in strong suppression of SCLC. The high degree of suppression suggested that L-Myc may constitute a therapeutic target for a broad subset of SCLC. We then used an RNA polymerase I inhibitor to target rRNA synthesis in an autochthonous Rb/p53-deleted mouse SCLC model and found significant tumor inhibition. These data reveal that activation of RNA polymerase I by L-Myc and other MYC family proteins provides an axis of vulnerability for this recalcitrant cancer.
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