T22‐GFP‐H6‐FdU‐induced reduction in tumor re‐initiation capacity and blockade of tumor emboli intravasation in the CXCR4+ patient‐derived M5 model T22‐GFP‐H6‐FdU‐induced.

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T22‐GFP‐H6‐FdU‐induced reduction in tumor re‐initiation capacity and blockade of tumor emboli intravasation in the CXCR4+ patient‐derived M5 model T22‐GFP‐H6‐FdU‐induced reduction in tumor re‐initiation capacity and blockade of tumor emboli intravasation in the CXCR4+ patient‐derived M5 model A, BReduction in the number of formed spheroids (white arrows, optical microscope) generated by 1 × 106 disaggregated cells (cultured in stem cell‐conditioned media and low‐adhesion plates) obtained from CXCR4+ M5 subcutaneous tumors, 24 h after 100 μg T22‐GFP‐H6‐FdU intravenous doses, for 2 consecutive days, as compared to Buffer‐treated or free oligo‐FdU‐treated mice (mean ± s.e.m., N = 8; 2 mice/group; 4 plates/mouse). Scale bar, 100 μm. Comparison of spheroid formation between groups: (B: Buffer; F: free oligo‐FdU; T‐F: T22‐GFP‐H6‐FdU). P‐values for statistical differences: T‐F vs. B, **P = 0.001 (green line, Panel B); F vs. B, *P = 0.012 (red line); T‐F vs. F, **P = 0.001 (black line). Mann–Whitney U‐test.C, DReduction in tumor re‐initiation capacity after subcutaneous inoculation of 5 × 106 cells in NSG mice (N = 4 tumors/group) derived from disaggregated tumor cells obtained from SC tumors 10 days after administration of 100 μg T22‐GFP‐H6‐FdU intravenous doses, for 2 consecutive days, as compared to free oligo‐FdU‐treated or Buffer‐treated mice. Recording of the number and size of positive tumors (black arrows, N = 4; 2 mice/group, 2 injection points/mouse).E–G(E) Representative images of tumor emboli intravasation determined by microscopic analyses of H&E‐stained tumor sections (N = 5/group). (F) T22‐GFP‐H6‐FdU‐induced reduction in the number of intravasated tumor emboli (black arrows) in peri‐tumoral vessels of the M5‐orthotopic primary tumor (E: optical images; F: emboli number quantitation) and reduction in CXCR4 expression in these emboli (G), treated 7 days after tumor cell implantation with 100 μg T22‐GFP‐H6‐FdU intravenous doses, for 2 consecutive days, as compared to Buffer‐treated or free oligo‐FdU‐treated mice. Tumor emboli counting in 10 high‐power field at 200× magnification in H&E‐stained sections from each tumor (mean ± s.e.m., N = 5/group). Comparison of tumor emboli number between groups: (B: Buffer; F: free oligo‐FdU; T‐F: T22‐GFP‐H6‐FdU). P‐values for statistical differences: T‐F vs. B, *P = 0.038 (green line), T‐F vs. F, *P = 0.016 (black line). Scale bar, 100 μm. (G) CXCR4 expression per tumor emboli determined by using anti‐CXCR4 IHC and calculating H‐score (multiplying percent of CXCR4+ cells out of total cell number in the emboli area by their staining intensity, scoring each from 0 to 3 (where 3 is the maximal intensity) per tumor emboli area (mean ± s.e.m., N = 5 mice/group). Comparison of CXCR4 H‐score between groups: (B: Buffer; T‐F: T22‐GFP‐H6‐FdU). P‐values for statistical differences: T‐F vs. B at *P = 0.027 (green line). Mann–Whitney U‐test. María Virtudes Céspedes et al. EMBO Mol Med. 2018;emmm.201708772 © as stated in the article, figure or figure legend