Mesenchymal Stromal Cells Promote Tumor Growth through the Enhancement of Neovascularization

作者：Kazuhiro Suzuki, Ruowen Sun, Makoto Origuchi, Masahiko Kanehira, Takenori Takahata, Jugoh Itoh, Akihiro Umezawa, Hiroshi Kijima, Shinsaku Fukuda, Yasuo Saijo · 发表于：Molecular Medicine · 年份：2011 · DOI：10.2119/molmed.2010.00157 · 被引用次数：244 · 研究领域：Mesenchymal stem cell research、Electrospun Nanofibers in Biomedical Applications、Tissue Engineering and Regenerative Medicine

Mesenchymal stromal cells (MSCs), also called mesenchymal stem cells, migrate and function as stromal cells in tumor tissues. The effects of MSCs on tumor growth are controversial. In this study, we showed that MSCs increase proliferation of tumor cells in vitro and promote tumor growth in vivo. We also further analyzed the mechanisms that underlie these effects. For use in in vitro and in vivo experiments, we established a bone marrow-derived mesenchymal stromal cell line from cells isolated in C57BL/6 mice. Effects of murine MSCs on tumor cell proliferation in vitro were analyzed in a coculture model with B16-LacZ cells. Both coculture with MSCs and treatment with MSC-conditioned media led to enhanced growth of B16-LacZ cells, although the magnitude of growth stimulation in cocultured cells was greater than that of cells treated with conditioned media. Co-injection of B16-LacZ cells and MSCs into syngeneic mice led to increased tumor size compared with injection of B16-LacZ cells alone. Identical experiments using Lewis lung carcinoma (LLC) cells instead of B16-LacZ cells yielded similar results. Consistent with a role for neovascularization in MSC-mediated tumor growth, tumor vessel area was greater in tumors resulting from co-injection of B16-LacZ cells or LLCs with MSCs than in tumors induced by injection of cancer cells alone. Co-injected MSCs directly supported the tumor vasculature by localizing close to vascular walls and by expressing an endothelial marker. Furtherm...