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4 protocols using mc38 colon carcinoma cells

1

Engineered Cell Lines for Immunotherapies

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Chinese hamster ovary (CHO) or human embryonic kidney (HEK) cells were transfected to stably express CTLA-4 and/or OX40. The following cell lines were generated and used: CHO-CTLA-4 (0.1 × 106 receptors/cell), HEK-CTLA-4 (0.8 × 106 receptors/cell), CHO-CTLA-4-OX40 (0.7 × 106 CTLA-4 receptors/cell; 4.8 × 106 OX40 receptors/cell) and CHO-OX40 (1.1 × 106 receptors/cell). Moreover, CHO-FcγRI (0.1 × 106 receptors/cell) were used for crosslinking of ATOR-1015. All cell lines were cultured in RPMI-1640 with Glutamax (Gibco) supplemented with 10% fetal bovine serum (FBS, GE Healthcare), 10 mM HEPES (Gibco), zeocin (250 μg/ml) and/or geneticin (600 μg/ml, Gibco) depending on selection pressure.
MB49 bladder cancer cells (EMD Millipore) were cultured in modified DMEM (high glucose, Glutamax and sodium pyruvate) supplemented with 10% FBS. MC38 colon carcinoma cells (Kerafast) were cultured in RPMI-1640 with Glutamax supplemented with 10% FBS, 10 mM HEPES, 1 mM sodium pyruvate and 0.05 mM 2-mercaptoethanol.
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2

Subcutaneous Tumor Implantation in Mice

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MC38 colon carcinoma cells were purchased from Kerafast. B16‐F10 melanoma cells were purchased from ATCC. Cell lines were passaged in DMEM (Invitrogen) supplemented with 10% FCS and antibiotics. 3·5 × 105 − 2 × 106 MC38 cells in 100 µl PBS or 1·25 × 105 B16‐F10 cells in 100 µl PBS were injected subcutaneously into the right flanks of mice, and tumours were measured with digital callipers at serial time‐points after implantation as previously described [37 ].
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3

Cell Line Maintenance for Tumor Studies

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The HEK293T cell line (female) was mycoplasma tested before the lentiviral viral production. Cells were maintained in a 5% CO2, 95% air, humidified incubator at 37°C, in DMEM supplemented with 1X penicillin-streptomycin and 10% FBS (Sigma, F2442). MC38 colon carcinoma cells (female) were purchased from Kerafast and maintained in a 5% CO2, 95% air, humidified incubator at 37°C in DMEM supplemented with 10% FBS, 100 U/mL penicillin, and 100 mg/mL streptomycin. MCA205 fibrosarcoma cells (unknown sex) were purchased from Millipore Sigma and maintained in a 5% CO2, 95% air, humidified incubator at 37°C in RPMI supplemented with 10% FBS, 100 U/mL penicillin, 100 mg/mL streptomycin, 1 mM sodium pyruvate, 100 μM non-essential amino acids, and 0.055 nM 2-mercaptoethanol. MC38 and MCA205 cells utilized in in vivo experiments were under 5 passages from purchase.
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4

Cell Line Characterization and Preparation for Murine Tumor Studies

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The murine MC38 colon carcinoma cells were purchased from Kerafast (Boston, MA). Murine C26 colon carcinoma cells were generously provided by the laboratory of Denis Guttridge (while at The Ohio State University) who obtained the cells through a Material Transfer Agreement with the NCI (Bethesda, MD) in 2001. Cultured murine C26 cells were maintained in RPMI, while LLC, and MC38 cells were maintained in Dulbecco's Modified Eagle Medium (DMEM). All media was supplemented with 10% fetal bovine serum (FBS) and 1% penicillin-streptomycin, at 37 °C in a humidified incubator with 5% CO2. For injection into mice, cells were harvested with trypsin, pelleted by centrifugation in FBS-supplemented DMEM, and then resuspended in sterile PBS at a concentration of 5 × 106 cells/mL for C26 and MC38 or 10 × 106 cells/mL for LLC. Prior to injection, all cell lines were confirmed negative for mycoplasma using the commercially available Plasmotest kit (Invivogen, San Diego, CA).
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