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Generation Of SV40- Transformed Rabbit Tracheal Epithelial Cell Derived Blastocyst By Somatic Cell Nuclear Transfer | 5230
ISSN: 2157-7013

Journal of Cell Science & Therapy
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International Conference & Exhibition on Cell Science & Stem Cell Research

De Semir D, Maurisse R, Du F, Xu J, Yang X and Gruenert DC
ScientificTracks Abstracts: J Cell Sci Ther
DOI: 10.4172/2157-7013.S1.02
Abstract
Mesenchymal stem cells (MSCs) tend to infi ltrate into tumors and form a major component of the tumor microenvironment. Yet, the mechanisms through which these tumor-resident MSCs may aff ect tumor growth are largely unknown. We found that MSCs isolated from spontaneous mouse lymphomas (L-MSCs) could strikingly enhance lymphoma growth, whereas bone marrow MSCs (BM-MSCs) did not. Surprisingly, tumor promotion by L-MSCs was not related to immunosuppression by these cells, while they recruited abundant CD11b+Gr-1+ myeloid suppressor cells and F4/80+ macrophages to the tumor. Depletion of macrophages but not myeloid suppressor cells completely abolished the tumor-promoting eff ect by L-MSCs. Furthermore, L-MSCs expressed high levels of CCR2 ligands-CCL2, CCL-7 and CCL-12, and macrophage accumulation and tumor-promotion by L-MSCs were absent in CCR2-/- mice. Interestingly, infl ammatory cytokine-treated BM-MSCs acted similarly with L-MSCs, indicating the importance of the infl ammatory cytokines in remodeling the tumor stroma. Finally, these fi ndings were found nonspecifi c to lymphomas, but also applicable to other tumor types, such as mouse melanoma. Th erefore, our fi ndings demonstrate that tumor- associated MSCs contribute to tumor development through CCR2-dependent recruitment of macrophages to the tumor, a novel mechanism through which tumor-resident MSCs function in the tumor microenvironment. Th is study also bears important information for current MSC- based therapies
Biography
Guangwen Ren completed his Ph.D from UMDNJ-Rutgers University and postdoctoral studies from Robert Wood Johnson Medical School. He is currently a research teaching specialist of Child Health Institute of New Jersey. His studies are focusing on the immunoregulation of mesenchymal stem cells, which have been published in Cell Stem Cell, Journal of Experimental Medicine, Stem Cells, Journal of Immunology and Cell Research, with him as the leading author. He served as peer-reviewers for over 25 scienti fi c journals and editorial board members of World Journal of Stem Cells, Journal of Medical Science and The Open Autoimmunity Journal.
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