Abstract
Objective
Previous studies suggest that tumor cells might be the progenitor for tumor vasculature. Whether vascular tube formation from transdifferentiation of human glioma stem/progenitor cells (hGSPCs) contribute to angiogenesis of gliomas remain largely uncertain.
Methods
hGSPCs were isolated from thirteen surgical specimens of gliomas and cultured in medium favored for stem cell growth. In vitro transdifferentiation of hGSPCs was performed under hypoxia. Expression of vascular endothelial cells (VECs) markers CD31, CD34, kinase insert domain receptor (KDR), and von Willebrand factor (vWF) were analyzed with real-time quantitative RT-PCR and immunofluorescence techniques. Vasculogenic mimicry of hGSPCs was evaluated in a tumor stem cell xenograft model in vivo. Relationships between content of hGSPCs and expression levels of both VECs markers and proangiogenic factors in large number of clinical specimens were further investigated in glioma tissue microarray.
Results
In vitro, hGSPCs can transdifferentiate into VECs under hypoxia, they manifested typical “flagstone” pattern when cultivated in medium containing VEGF for a few days; when cultivated on Matrigel they were capable of forming capillary-like structures. Expression of VECs markers including CD31, CD34, KDR, and vWF were significantly up-regulated after transdifferentiation. Human leukocyte antigen (HLA) positively stained vessels were observed inside the xenograft tumors after intracerebral transplantation of hGSPCs in athymic nude mice, implied part of tumor cells with human origin were involved in formation of tumor vessels. In surgical specimens of human glioma, tumor vascular cells coexpressing the markers of early VECs (CD34) and markers of hGSPCs (ABCG2 and nestin) suggest that these vascular cells may stemmed from hGSPCs.
Conclusions
Our observations suggest the functional role of hGSPCs as endothelial progenitors, which have properties that give rise to VECs, and have the ability to form vascular endothelial tubes. However, unspecific markers (ABCG2, nestin) that stain for both endothelial as well as glioma stem cells, were found to be expressed in tumor vasculature of human specimen, and limit further interpretation of this finding.






References
Folkman, J. (1971). Tumor angiogenesis: therapeutic implications. The New England Journal of Medicine, 285(21), 1182–1186.
Fox, S. B., Gatter, K. C., & Harris, A. L. (1996). Tumour angiogenesis. The Journal of Pathology, 179(3), 232–237.
Maniotis, A. J., Folberg, R., Hess, A., et al. (1999). Vascular channel formation by human melanoma cells in vivo and in vitro: vasculogenic mimicry. The American Journal of Pathology, 155(3), 739–752.
Reya, T., Morrison, S. J., Clarke, M. F., & Weissman, I. L. (2001). Stem cells, cancer, and cancer stem cells. Nature, 414(6859), 105–111.
Wicha, M. S., Liu, S., & Dontu, G. (2006). Cancer stem cells: an old idea-a paradigm shift. Cancer Research, 66(4), 1883–1890.
Al-Hajj, M., Wicha, M. S., Benito-Hernandez, A., Morrison, S. J., & Clarke, M. F. (2003). Prospective identification of tumorigenic breast cancer cells. Proceedings of the National Academy of Sciences of the United States of America, 100(7), 3983–3988.
Bonnet, D., & Dick, J. E. (1997). Human acute myeloid leukemia is organized as a hierarchy that originates from a primitive hematopoietic cell. Natural Medicines, 3(7), 730–737.
Lapidot, T., Sirard, C., Vormoor, J., et al. (1994). A cell initiating human acute myeloid leukemia after transplantation into SCID mice. Nature, 367(6464), 645–648.
Tang, C., Ang, B. T., & Pervaiz, S. (2007). Cancer stem cell: target for anti-cancer therapy. The FASEB Journal, 21(14), 3777–3785.
Monzani, E., & La Porta, C. A. (2008). Targeting cancer stem cells to modulate alternative vascularization mechanisms. Stem Cell Reviews, 4(1), 51–56.
Shen, R., Ye, Y., Chen, L., Yan, Q., Barsky, S. H., & Gao, J. X. (2008). Precancerous stem cells can serve as tumor vasculogenic progenitors. PLoS ONE, 3(2), e1652.
Bleau, A. M., Hambardzumyan, D., Ozawa, T., et al. (2009). PTEN/PI3K/Akt pathway regulates the side population phenotype and ABCG2 activity in glioma tumor stem-like cells. Cell Stem Cell, 4(3), 226–35.
Huang, Q., Zhang, Q. B., Dong, J., et al. (2008). Glioma stem cells are more aggressive in recurrent tumors with malignant progression than in the primary tumor, and both can be maintained long-term in vitro. BMC Cancer, 8, 304.
Ji, X. Y., Huang, Q., Dong, J., Zhu, Y. D., Wang, A. D., & Lan, Q. (2006). Characteristics of morphology, differentiation related markers, and proliferation dynamics of differentiated brain tumor stem cells in vitro[in Chinese]. Zhonghua Yi Xue Za Zhi, 86(23), 1604–1609.
Zhang, Q. B., Ji, X. Y., Huang, Q., Dong, J., Zhu, Y. D., & Lan, Q. (2006). Differentiation profile of brain tumor stem cells: a comparative study with neural stem cells. Cell Research, 16(12), 909–915.
Goldberg, M. P., & Choi, D. W. (1993). Combined oxygen and glucose deprivation in cortical cell culture: calcium-dependent and calcium-independent mechanisms of neuronal injury. The Journal of Neuroscience, 13(8), 3510–3524.
Zhai, D. Z., Huang, Q., Zhu, Q., et al. (2007). Expression of cyclin-dependent kinase CDC2 and its significance in malignant progression of gliomas[in Chinese]. Zhonghua Bing Li Xue Za Zhi, 36(3), 196–197.
Chang, Y. S., di Tomaso, E., McDonald, D. M., Jones, R., Jain, R. K., & Munn, L. L. (2000). Mosaic blood vessels in tumors: frequency of cancer cells in contact with flowing blood. Proceedings of the National Academy of Sciences of the United States of America, 97(26), 14608–14613.
Folkman, J. (2001). Can mosaic tumor vessel facilitate molecular diagnosis of cancer? Proceedings of the National Academy of Sciences of the United States of America, 98(2), 398–400.
Singh, S. K., Clarke, I. D., Terasaki, M., et al. (2003). Identification of a cancer stem cell in human brain tumors. Cancer Research, 63(18), 5821–5828.
Lin, C., McGough, R., Aswad, B., Block, J. A., & Terek, R. (2004). Hypoxia induces HIF-1alpha and VEGF expression in chondrosarcoma cells and chondrocytes. Journal of Orthopaedic Research, 22(6), 1175–1181.
Risau, W. (1997). Mechanisms of angiogenesis. Nature, 386(6626), 671–674.
Kim, M., Turnquist, H., Jackson, J., et al. (2002). The multidrug resistance transporter ABCG2 (breast cancer resistance protein 1) effluxes Hoechst 33342 and is overexpressed in hematopoietic stem cells. Clinical Cancer Research, 8(1), 22–28.
Robey, R. W., Steadman, K., Polgar, O., et al. (2004). Pheophorbide a is a specific probe for ABCG2 function and inhibition. Cancer Research, 64(4), 1242–1246.
Scharenberg, C. W., Harkey, M. A., & Torok-Storb, B. (2002). The ABCG2 transporter is an efficient Hoechst 33342 efflux pump and is preferentially expressed by immature human hematopoietic progenitors. Blood, 99(2), 507–512.
Doyle, L. A., Yang, W., Abruzzo, L. V., et al. (1998). A multidrug resistance transporter from human MCF-7 breast cancer cells. Proceedings of the National Academy of Sciences of the United States of America, 95(26), 15665–15670.
Goodell, M. A., Brose, K., Paradis, G., Conner, A. S., & Mulligan, R. C. (1996). Isolation and functional properties of murine hematopoietic stem cells that are replicating in vivo. The Journal of Experimental Medicine, 183(4), 1797–1806.
Zhou, S., Morris, J. J., Barnes, Y., Lan, L., Schuetz, J. D., & Sorrentino, B. P. (2002). Bcrp1 gene expression is required for normal numbers of side population stem cells in mice, and confers relative protection to mitoxantrone in hematopoietic cells in vivo. Proceedings of the National Academy of Sciences of the United States of America, 99(19), 12339–12344.
Zhou, S., Schuetz, J. D., Bunting, K. D., et al. (2001). The ABC transporter Bcrp1/ABCG2 is expressed in a wide variety of stem cells and is a molecular determinant of the side-population phenotype. Natural Medicines, 7(9), 1028–1034.
Kondo, T., Setoguchi, T., & Taga, T. (2004). Persistence of a small subpopulation of cancer stem-like cells in the C6 glioma cell line. Proceedings of the National Academy of Sciences of the United States of America, 101(3), 781–786.
Abbott, B. L. (2006). ABCG2 (BCRP): a cytoprotectant in normal and malignant stem cells. Clinical Advances in Hematology & Oncology, 4(1), 63–72.
Dahlstrand, J., Zimmerman, L. B., McKay, R. D., & Lendahl, U. (1992). Characterization of the human nestin gene reveals a close evolutionary relationship to neurofilaments. Journal of Cell Science, 103(Pt 2), 589–597.
Frederiksen, K., & McKay, R. D. (1988). Proliferation and differentiation of rat neuroepithelial precursor cells in vivo. The Journal of Neuroscience, 8(4), 1144–1151.
Fuchs, E. (1994). Intermediate filaments and disease: mutations that cripple cell strength. The Journal of Cell Biology, 125(3), 511–516.
Hockfield, S., & McKay, R. D. (1985). Identification of major cell classes in the developing mammalian nervous system. The Journal of Neuroscience, 5(12), 3310–3328.
Lendahl, U., Zimmerman, L. B., & Mckay, R. (1990). CNS stem cells express a new class of intermediate filament protein. Cell, 60(4), 585–595.
Dahlstrand, J., Collins, V. P., & Lendahl, U. (1992). Expression of the class VI intermediate filament nestin in human central nervous system tumors. Cancer Research, 52(19), 5334–5341.
Gehling, U. M., Ergün, S., Schumacher, U., et al. (2000). In vitro differentiation of endothelial cells from AC133-positive progenitor cells. Blood, 95(10), 3106–3112.
Hristov, M., Erl, W., & Weber, P. C. (2003). Endothelial progenitor cells: isolation and characterization. Trends in Cardiovascular Medicine, 13(5), 201–206.
Peichev, M., Naiyer, A. J., Pereira, D., et al. (2000). Expression of VEGFR-2 and AC133 by circulating human CD34(+) cells identifies a population of functional endothelial precursors. Blood, 95(3), 952–958.
Aghi, M., Cohen, K. S., Klein, R. J., Scadden, D. T., & Chiocca, E. A. (2006). Tumor stromal-derived factor-1 recruits vascular progenitors to mitotic neovasculature, where microenvironment influences their differentiated phenotypes. Cancer Research, 66(18), 9054–9064.
Alvarez-Dolado, M., Pardal, R., Garcia-Verdugo, J. M., et al. (2003). Fusion of bone-marrow-derived cells with Purkinje neurons, cardiomyocytes and hepatocytes. Nature, 425(6961), 968–973.
Chen, K. A., Laywell, E. D., Marshall, G., Walton, N., Zheng, T., & Steindler, D. A. (2006). Fusion of neural stem cells in culture. Experimental Neurology, 198(1), 129–135.
Acknowledgments
This study is supported by National Basic Research Program of China (973 program, 2010CB529403), and National Natural Science Foundation of China (No. 30872654; 30973081).
Conflicts of interest
None
Author information
Authors and Affiliations
Corresponding author
Additional information
Jun Dong and Yaodong Zhao have contributed to this paper equally.
Rights and permissions
About this article
Cite this article
Dong, J., Zhao, Y., Huang, Q. et al. Glioma Stem/Progenitor Cells Contribute to Neovascularization via Transdifferentiation. Stem Cell Rev and Rep 7, 141–152 (2011). https://doi.org/10.1007/s12015-010-9169-7
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12015-010-9169-7