期刊
CANCER RESEARCH
卷 73, 期 23, 页码 7079-7089出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-13-1355
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资金
- NIH/NCI [RC1 CA146065]
- Cornell Center on the Microenvironment Metastasis [NCI U54 CA143876]
- NIH [5K08CA130985-05, T35AI007227]
- American Brain Tumor Association (ABTA)
- National Cancer Institute/Cornell Nanobiotechnology Center Young Investigator Award
- NYSTEM
Glioblastoma multiforme contains a subpopulation of cancer stem-like cells (CSC) believed to underlie tumorigenesis and therapeutic resistance. Recent studies have localized CSCs in this disease adjacent to endothelial cells (EC) in what has been termed a perivascular niche, spurring investigation into the role of EC-CSC interactions in glioblastoma multiforme pathobiology. However, these studies have been limited by a lack of in vitro models of three-dimensional disease that can recapitulate the relevant conditions of the niche. In this study, we engineered a scaffold-based culture system enabling brain endothelial cells to form vascular networks. Using this system, we showed that vascular assembly induces CSC maintenance and growth in vitro and accelerates tumor growth in vivo through paracrine interleukin (IL)-8 signaling. Relative to conventional monolayers, endothelial cells cultured in this three-dimensional system not only secreted enhanced levels of IL-8 but also induced CSCs to upregulate the IL-8 cognate receptors CXCR1 and CXCR2, which collectively enhanced CSC migration, growth, and stemness properties. CXCR2 silencing in CSCs abolished the tumor-promoting effects of endothelial cells in vivo, confirming a critical role for this signaling pathway in GMB pathogenesis. Together, our results reveal synergistic interactions between endothelial cells and CSCs that promote the malignant properties of CSCs in an IL-8-dependent manner. Furthermore, our findings underscore the relevance of tissue-engineered cell culture platforms to fully analyze signaling mechanisms in the tumor microenvironment. (C)2013 AACR.
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