SPP1 and TNC promote chemoresistance

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SPP1 and TNC promote chemoresistance SPP1 and TNC promote chemoresistance AExperimental treatment schedule of mice after cancer cell implantation in the mammary gland to address the role of SPP1 in resistance to PAX.BGrowth curves of mammary tumors in vehicle‐ or PAX‐treated Spp1+/− mice implanted with the indicated cells expressing control shRNA, and Spp1−/− mice implanted with the indicated cells expressing SPP1 shRNA. MDA231‐LM2: control, PAX, and SPP1 def. + PAX n = 16 tumors per group, SPP1 def. n = 14 tumors. SUM159‐LM1: control, PAX, and SPP1 def. + PAX n = 16 tumors per group, SPP1 def. n = 15 tumors. Each value represents the mean ± SEM. ****P < 0.0001.CQuantification of lung metastasis from the animals described in panels (A and B). The number of metastatic foci per field of view (FOV) or per lung section (LS) was determined. MDA231‐LM2 tumor‐bearing mice: control, PAX, and SPP1 def. + PAX n = 8 mice per group, SPP1 def. n = 7 mice. SUM159‐LM1 tumor‐bearing mice: control, PAX, and SPP1 def. + PAX n = 8 mice per group, SPP1 def. n = 7 mice. Ten fields per lung section were quantified. Each value represents the mean ± SEM.DTumor weight in mice at day 40 after implantation of MDA231‐LM2 breast cancer cells in a control or SPP1 deficient setting undergoing combination treatment with doxorubicin (adriamycin) and cyclophosphamide (AC regimen). Control, AC, and SPP1 def. n = 16 tumors per group, SPP1 def. + AC n = 14 tumors. Boxes represent median with upper and lower quartiles. Whiskers show maximum and minimum.ELung metastasis was quantified in mice that were implanted with MDA231‐LM2 tumors and subjected to AC chemotherapy. Each value represents the mean ± SEM; n = 5 mice per group. Ten random fields per lung section were analyzed for percentage of metastatic area.FRepresentative histological images of metastatic nodules in lungs of mice from the experiment described in panel (E). Metastases were determined by expression of human vimentin (arrows). Scale bar, 100 μm.GTreatment schedule after cancer cell implantation to address the role of TNC in PAX resistance in a xenograft mouse model for breast cancer metastasis to lungs. Mice were implanted with MDA231‐LM2 cells expressing either control shRNA (control) or a TNC shRNA (shTNC), treated with paclitaxel or vehicle.HMammary tumor growth curves in PAX‐treated NSG mice bearing control or TNC‐knockdown MDA231‐LM2 tumors. Values are means ± SEM, n = 16 tumors per group. ****P < 0.0001.ILung metastases quantified in tumor‐bearing mice from panel (H). Values are means ± SEM, n = 16 tumors per group.JRepresentative histology of human vimentin‐positive lung metastases (arrows) from the experiment described in panels (G–I). Scale bar, 100 μm.Data information: P‐values in panels (B–E, H, and I) were determined by two‐tailed Mann–Whitney test. Jacob Insua‐Rodríguez et al. EMBO Mol Med. 2018;emmm.201809003 © as stated in the article, figure or figure legend