期刊
ENDOCRINE-RELATED CANCER
卷 20, 期 6, 页码 797-808出版社
BIOSCIENTIFICA LTD
DOI: 10.1530/ERC-13-0329
关键词
obesity; breast cancer; cancer stem cell; leptin receptor; NANOG
资金
- Cleveland Clinic Foundation, NCI TREC development grant [U54CA116867]
- Case Comprehensive Cancer Center Pilot grant and Special Funds in Aging Cancer Energy Balance Research [P30 CA043703]
- American Cancer Society [IRG-91-022-15]
- Cleveland Clinical Translational Sciences Collaborative [UL1RR024989]
- K99/R00 Pathway to Independence Award [CA157948]
- NIH, V Foundation for Cancer Research
- Voices Against Brain Cancer
- American Cancer Society
- Ohio Cancer Research Associates
- USMRMC FY08 Breast Cancer Research Program Postdoctoral Fellowship [W81XWH09-1-0720]
Despite new therapies, breast cancer continues to be the second leading cause of cancer mortality in women, a consequence of recurrence and metastasis. In recent years, a population of cancer cells has been identified, called cancer stem cells (CSCs) with self-renewal capacity, proposed to underlie tumor recurrence and metastasis. We previously showed that the adipose tissue cytokine LEPTIN, increased in obesity, promotes the survival of CSCs in vivo. Here, we tested the hypothesis that the leptin receptor (LEPR), expressed in mammary cancer cells, is necessary for maintaining CSC-like and metastatic properties. We silenced LEPR via shRNA lentivirus transduction and determined that the expression of stem cell self-renewal transcription factors NANOG, SOX2, and OCT4 (POU5F1) is inhibited. LEPR-NANOG signaling pathway is conserved between species because we can rescue NANOG expression in human LEPR-silenced cells with the mouse LepR. Using a NANOG promoter GFP reporter, we showed that LEPR is enriched in NANOG promoter active (GFP+) cells. In lineage tracing studies, we showed that the GFP + Ccells divide in a symmetric and asymmetric manner. LEPR-silenced MDA-MB-231 cells exhibit a mesenchymal to epithelial transition morphologically, increased E-CADHERIN and decreased VIMENTIN expression compared with control cells. Finally, LEPR-silenced cells exhibit reduced cell proliferation, self-renewal in tumor sphere assays, and tumor outgrowth in xenotransplant studies. Given the emergence of NANOG as a pro-carcinogenic protein in multiple cancers, these studies suggest that inhibition of LEPR may be a promising therapeutic approach to inhibit NANOG and thereby neutralize CSC functions.
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