Bone marrow is a reservoir for proangiogenic myelomonocytic cells but not endothelial cells in spontaneous tumors by Andrew C. Dudley, Taturo Udagawa,

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Bone marrow is a reservoir for proangiogenic myelomonocytic cells but not endothelial cells in spontaneous tumors by Andrew C. Dudley, Taturo Udagawa, Juan M. Melero-Martin, Shou-Ching Shih, Adam Curatolo, Marsha A. Moses, and Michael Klagsbrun Blood Volume 116(17):3367-3371 October 28, 2010 ©2010 by American Society of Hematology

In vivo enumeration of bone marrow–derived endothelial cells in TRAMP prostate tumors. In vivo enumeration of bone marrow–derived endothelial cells in TRAMP prostate tumors. (A) Increasing concentrations of isolated TECs were spiked into 1 × 106 CD31− prostate cancer cells (TRAMP C1). CD31+ TECs were analyzed using FACS. The minimum number of TECs that could be detected was approximately 100 per 106 tumor cells, or approximately 0.01% of the total cellular pool. (B) FACS analysis of a well-differentiated prostate tumor in TRAMP (24 weeks of age) after bone marrow ablation/engraftment at 8 weeks of age. One-half of each tumor was used for histology and grading; the other half was used for FACS analysis. To enumerate BMDECs, live cells were selected from the forward scatter/side scatter (FSC/SSC) plot. FSC (x-axis) is in the linear scale and all fluorophores are in the log scale. CD45+ hematopoietic cells were gated out and the GFP+/CD31+ population was quantified. Resident or non–bone marrow–derived ECs were defined as CD45−/GFP−/CD31+. A third population (∼ 1%-2%) which was CD45−/GFP+/CD31− may be bone marrow mesenchymal stem cells. (C) Multiple prostates from wild-type mice and TRAMP mice were analyzed by FACS: WT, 12 to 14 weeks (n = 5); TRAMP, 12 to 14 weeks (n = 5); WT, 24 to 30 weeks (n = 4); TRAMP, 24 to 30 weeks (n = 5). Data were analyzed by analysis of variance (ANOVA) followed by Tukey multiple comparison test. There was no statistical difference in numbers of BMDECs between both groups and both time points. (D) The TRAMP C1 cell line was implanted subcutaneously in C57BL/6J mice 4 weeks after bone marrow ablation/engraftment. After 28 days, individual tumors (n = 5) were analyzed by FACS as described above. (E) Paraffin sections of either prostate tumors (i) or normal prostate (ii) were stained with GFP antibodies. GFP was detected using a horseradish peroxidase–coupled secondary antibody (brown staining). Nuclei were counterstained with hematoxylin (blue). Most GFP+ cells had a spherical appearance reminiscent of mononuclear cells, while others were larger and spindle-shaped. Scale bars represent 0.5 mm. (F) A well-differentiated prostate tumor stained with GFP antibodies in addition to antibodies for the blood vessel marker CD31 (i), the pericyte marker αSMA (ii), and the lymphatic endothelial cell marker LYVE-1 (iii). White arrows point to blood vessels. Asterisks mark perivascular GFP+ cells and the yellow asterisk marks a LYVE-1+/GFP+ perivascular cell. Note that erythrocytes autofluoresce within the lumen of some blood vessels. Nuclei were counterstained with DAPI (blue, i-iii). A perivascular positioning of GFP+ cells was also observed in a spontaneous lung metastasis in TRAMP mice (iv). The arrow points to a large, erythrocyte-filled tumor blood vessel surrounded by GFP+ marrow–derived cells (no counter stain was used). Scale bar represents 100 μm. Andrew C. Dudley et al. Blood 2010;116:3367-3371 ©2010 by American Society of Hematology

In vivo and in vitro characterization of bone marrow–derived cells in TRAMP prostate tumors. In vivo and in vitro characterization of bone marrow–derived cells in TRAMP prostate tumors. (A) FACS analysis of spontaneous prostate tumors in TRAMP mice (24-30 weeks of age). Representative plots of GFP+ cells retrieved from tumors costained with the indicated antibodies is shown. (B) Quantitative analysis of hematopoietic/myeloid cells in TRAMP prostate tumors (n = 3). Approximately 99% of all BMDC are CD45+ hematopoietic cells. (C) Sections of well-differentiated prostate tumors were stained with GFP and CD11b antibodies (i). Yellow cells indicate the merged coexpression. Nuclei were counterstained with DAPI (blue). Scale bar represents 100 μm. (D) After bone marrow ablation/engraftment, collagenase-digested prostate tumors were plated into tissue-culture dishes. Numerous GFP+ colonies appeared after approximately 1 week in culture from which spindle-shaped GFP+ cells emerged (i). Scale bar represents 0.5 mm. After 2 weeks, cells were treated with trypsin, and tightly adhered, trypsin-resistant cells TD-CFUs were analyzed by qRT-PCR. Similar to PBM cells, TD-CFUs were enriched in expression of CD45, CD11b, F4-80, and GR-1 but not VE-Cadherin (ii). Also by qRT-PCR, MMP2 is predominately expressed by TECs, while PBM cells and TD-CFUs express both MMP9 and MMP2 (iii). (E) TECs formed branching, cord-like structures when plated at low densities and admixed with freshly isolated PBM cells on thin matrigel layers. PBM cells, which appear as small, refractive cells in the high-powered magnification, closely aligned with these branching structures along the TEC surface (i). At right, the same field is shown where TECs fluoresce in red and PBM cells from GFP+ donor mice fluoresce in green (ii). Scale bars represent 50 μm. (F) PBM cells addition increased TEC branching when cells were plated in low serum and at low density on matrigel. The addition of TECs only resulted in few branching structures (i) while TECs cocultured with PBM cells resulted in TEC branching and tube formation (ii). PBM cells addition increased TEC branching 10-fold when averaged from 3 independent observations (iii). Data were evaluated by Student t test and the P value is indicated on the graph. Scale bars represent 0.5 mm. Andrew C. Dudley et al. Blood 2010;116:3367-3371 ©2010 by American Society of Hematology