期刊
CANCER RESEARCH
卷 73, 期 17, 页码 5556-5568出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-13-0013
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资金
- National Cancer Institute [CA87548, CA152228, P50CA116199]
- Susan G. Komen [KG100876, KG100521]
- MD Anderson's Cancer Center [CA016672]
- Department of Defense (DoD) Predoctoral Breast Cancer Traineeship Award
- American Legion Auxiliary Fellowship
- Andrew Sowell-Wade Huggins Fellowship
- DoD Breast Cancer Concept award [BC097188]
Expression of cyclin E proteolytic cleavage products, low-molecular weight cyclin E (LMW-E), is associated with poor clinical outcome in patients with breast cancer and it enhances tumorigenecity in mouse models. Here we report that LMW-E expression in human mammary epithelial cells induces an epithelial-to-mesenchymal transition phenotype, increases the CD44(hi)/CD24(lo) population, enhances mammosphere formation, and upregulates aldehyde dehydrogenase expression and activity. We also report that breast tumors expressing LMW-E have a higher proportion of CD44(hi)/CD24(lo) tumor cells as compared with tumors expressing only full-length cyclin E. In order to explore how LMW-E enriches cancer stem cells in breast tumors, we conducted a protein microarray analysis that identified the histone acetyltransferase (HAT) Hbo1 as a novel cyclin E/CDK2 substrate. The LMW-E/CDK2 complex phosphorylated Hbo1 at T88 without affecting its HAT activity. When coexpressed with LMW-E/CDK2, wild-type Hbo1 promoted enrichment of cancer stem-like cells (CSC), whereas the T88 Hbo1 mutant reversed the CSC phenotype. Finally, doxorubicin and salinomycin (a CSC-selective cytotoxic agent) synergized to kill cells expressing LMW-E, but not full-length cyclin E. Collectively, our results suggest that the heightened oncogenecity of LMW-E relates to its ability to promote CSC properties, supporting the design of therapeutic strategies to target this unique function. Cancer Res; 73(17); 5556-68. (C) 2013 AACR.
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