Abstract
We previously identified a distinct population of human circulating hematopoietic stem and progenitor cells (CHSPCs; CD14−glyA−CD34+AC133+/−CD45dimCD31+ cells) in the peripheral blood (PB) and bone marrow, and their frequency in the PB can correlate with disease state. The proangiogenic subset (pCHSPC) play a role in regulating tumor progression, for we previously demonstrated a statistically significant increase in C32 melanoma growth in NOD.Cg-Prkdcscid (NOD/SCID) injected with human pCHSPCs (p < 0.001). We now provide further evidence that pCHSPCs possess proangiogenic properties. In vitro bio-plex cytokine analyses and tube forming assays indicate that pCHSPCs secrete a proangiogenic profile and promote vessel formation respectively. We also developed a humanized bone marrow-melanoma orthotopic model to explore in vivo the biological significance of the pCHSPC population. Growth of melanoma xenografts increased more rapidly at 3–4 weeks post-tumor implantation in mice previously transplanted with human CD34+ cells compared to control mice. Increases in pCHSPCs in PB correlated with increases in tumor growth. Additionally, to determine if we could prevent the appearance of pCHSPCs in the PB, mice with humanized bone marrow-melanoma xenografts were administered Interferon α-2b, which is used clinically for treatment of melanoma. The mobilization of the pCHSPCs was decreased in the mice with the humanized bone marrow-melanoma xenografts. Taken together, these data indicate that pCHSPCs play a functional role in tumor growth. The novel in vivo model described here can be utilized to further validate pCHSPCs as a biomarker of tumor progression. The model can also be used to screen and optimize anticancer/anti-angiogenic therapies in a humanized system.
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Acknowledgments
We acknowledge the assistance and state-of-the-art facilities of the Flow Cytometry Resource Facility at the Indiana University Simon Cancer Center. We also acknowledge Barbara Bailey of the In Vivo Therapeutics Core of the Indiana University Simon Cancer Center, as well as the nursing staff and Dr. Arthur Baluyut at the St. Vincent Hospital (Indianapolis, IN) for providing some of the UCB samples used for this study. We acknowledge Hui Lin Chau and Artur Plett of the Bio-Plex Core of the Indiana University Simon Cancer Center. Finally, we acknowledge the Angiogenesis, Endothelial and Pro-Angiogenic Cell Core of the Indiana University Simon Cancer Center for providing some of the CD34+ cells and ECFCs used for this study. We acknowledge the continuing support of the Riley Children’s Foundation and the Indiana University Simon Cancer Center. This work was supported by the American Cancer Society IRG-84-002-25 (J.C.), Showalter Trust Fund ERA 31948 (J.C.), NIH/NIDDK P30DK090948 CEMH (J.C., J.A.M and K.E.P.), RO1 CA138798 (H.W., S.C., and K.E.P.) and the Jeff Gordon Research Foundation (H.W. and K.E.P.).
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Mund, J.A., Shannon, H., Sinn, A.L. et al. Human proangiogenic circulating hematopoietic stem and progenitor cells promote tumor growth in an orthotopic melanoma xenograft model. Angiogenesis 16, 953–962 (2013). https://doi.org/10.1007/s10456-013-9368-3
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DOI: https://doi.org/10.1007/s10456-013-9368-3