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7 protocols using anti mouse ifn γ

1

Treg Cell Ablation and Depletion Protocol

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For Treg cell ablation studies, DT (Sigma-Aldrich) was injected
intraperitoneally (i.p.) at 50 µg per kg of body weight at the indicated
times. For neutralization and depletion studies, anti-mouse IFN-γ (1 mg,
clone XMG1.2, Bio X Cell) or anti-mouse CD11c (500 µg, clone N418, Bio X
Cell) or anti-mouse CD8 (250 µg, clone 53–6.72, Bio X Cell) or
anti-mouse CD4 (150 µg, clone GK1.5, Bio X Cell) or anti-mouse CD25 (500
µg, clone PC-61.5.3, Bio X Cell) were injected i.p. at the indicated
times. Isotype control antibodies used were Rat IgG1 or Armenian hamster IgG or
Rat IgG2a from Bio X Cell, respectively.
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2

Quantification of IL-12 and IFN-γ in LLC Tumors

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LLC tumor tissue sections were prepared as previously described (Oh et al., 2017 (link)). Briefly, tumor tissues were fixed in 2% paraformaldehyde overnight, followed by embedding in optimum cutting temperature (O.C.T.; Tissue-Tek) compound, and were cut into 14-μm sections. The sections were blocked with 1.0% BSA in PBST (PBS+ 0.1% Tween 20) and incubated with anti-mouse IL-12 p40 (Bio X Cell) or anti-mouse IFN-γ (Bio X Cell) at room temperature for 1 hr. After wash 3 times with PBST, the sections were stained with goat anti-rat IgG H&L (Alexa Fluor® 568) at room temperature for 1 hr. The sections were next counterstained with DAPI and mounted on glass slides. Images were acquired with a LSM880 microscope with Airyscan and FAST Airyscan High Resolution and 32-channel spectral detectors. Relative fluorescence intensity of IL-12 or IFN-γ was quantified by normalizing integrated fluorescence intensity of IL-12 or IFN-γ to the total cell numbers of macrophages, DCs, or CD8+ T cells per mg of tumor.
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3

EAE Adoptive Transfer Protocol

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Donor mice were induced with active EAE as described above, but without pertussis toxin. Eleven days after active EAE induction, dLN cells were collected, RBC lysed, and incubated in 10% RPMI containing 10% FBS (Cat#SZ-0501, Hooke Laboratories Inc., MA, USA) with 20 µg/ml MOG35–55 peptide (Mimotopes, Victoria, Australia), 10 µg/ml anti-mouse IFNγ (Cat#BE0055, Bio X Cell, NH, USA), 20 ng/ml recombinant mouse IL-23 (Cat#589004, Biolegend, CA, USA) at 3 million cells/ml for 72 h at 37 °C, 5% CO2, for in vitro reactivation. In vitro reactivated mouse CD4+ T cells were purified as above, and 20 million in vitro reactivated CD4+ T cells were transferred into recipient mice intraperitoneally. Clinical scoring of recipient mice was performed starting 5 days following adoptive/passive transfer of in vitro reactivated CD4+ T cells, every day until the completion of the experiment.
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4

Treg Cell Ablation and Depletion Protocols

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For Treg cell ablation studies, DT (Sigma-Aldrich) was injected intraperitoneally (i.p.) at 50 μg per kg of body weight at the indicated times. For neutralization and depletion studies, anti-mouse IFN-γ (1 mg, clone XMG1.2, Bio X Cell), anti-mouse CD11c (500 μg, clone N418, Bio X Cell), anti-mouse CD8 (250 μg, clone 53-6.72, Bio X Cell), anti-mouse CD4 (150 μg, clone GK1.5, Bio X Cell), or anti-mouse CD25 (500 μg, clone PC-61.5.3, Bio X Cell) was injected i.p. at the indicated times. Isotype control antibodies used were rat IgG1, Armenian hamster IgG, or rat IgG2a from Bio X Cell, respectively.
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5

T-cell Polarization Cytokine Assay

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After cell transfection and/or treatment, supernatants were replaced by mouse T-cell culture medium or AIM V medium (Gibco) for human cells containing polarization cytokines as follows: anti-mouse IFN-γ (50 μg/mL, clone XMG 1.2; BioXCell) and anti-mouse IL-4 (50 μg/mL, clone 11B11; BioXCell) for mouse TH0 cells; IL-12 (10 ng/mL, Miltenyi Biotec) and anti-mouse IL-4 for mouse TH1 cells; TGF-β (2 ng/mL, Miltenyi Biotec), IL-4 (20 ng/mL, Miltenyi Biotec), and anti-mouse IFN-γ for mouse TH9 cells; IL-6 (20 ng/mL, Miltenyi Biotec), TGF-β, anti-mouse IFN-γ, and anti-mouse IL-4 for mouse TH17, IL-12 (10 ng/mL, R&D System) and anti-human IL-4 (3.5 μg/mL, clone MP4-25D2; BioXCell) for human TH1 cells, TGF-β (5 ng/mL, Miltenyi Biotec), IL-4 (10 ng/mL, R&D System), and anti-human IFN-γ (3.5 μg/mL, clone NIB42; BioLegend) for human TH9 cells. Unless specified otherwise, cells were cultured for 3 days at 37°C under 5% CO2.
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6

Quantification of IL-12 and IFN-γ in LLC Tumors

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LLC tumor tissue sections were prepared as previously described (Oh et al., 2017 (link)). Briefly, tumor tissues were fixed in 2% paraformaldehyde overnight, followed by embedding in optimum cutting temperature (O.C.T.; Tissue-Tek) compound, and were cut into 14-μm sections. The sections were blocked with 1.0% BSA in PBST (PBS+ 0.1% Tween 20) and incubated with anti-mouse IL-12 p40 (Bio X Cell) or anti-mouse IFN-γ (Bio X Cell) at room temperature for 1 hr. After wash 3 times with PBST, the sections were stained with goat anti-rat IgG H&L (Alexa Fluor® 568) at room temperature for 1 hr. The sections were next counterstained with DAPI and mounted on glass slides. Images were acquired with a LSM880 microscope with Airyscan and FAST Airyscan High Resolution and 32-channel spectral detectors. Relative fluorescence intensity of IL-12 or IFN-γ was quantified by normalizing integrated fluorescence intensity of IL-12 or IFN-γ to the total cell numbers of macrophages, DCs, or CD8+ T cells per mg of tumor.
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7

3D Organotypic Tumor Spheroid Assays

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Murine-derived and patient-derived organotypic tumor spheroids (MDOTS/PDOTS) were prepared, cultured, and characterized as previously described (summarized in the Supplemental Material).[44 (link)] Immune cells were present from the initial tumor resection, and spheroid-collagen mixtures (10 μL, 2.5 mg/mL tumor spheroids) were injected into the center gel region of the AIM Dax-01 3D microfluidic culture device (AIM Biotech, Singapore). After incubation (30 minutes at 37°C) in sterile humidity chambers, collagen hydrogels containing MDOTS/PDOTS were hydrated with media (Dulbecco's modified Eagle's medium), with or without the indicated treatments. Treatments included the antibodies anti-human IFNγ (10 μg/mL), anti-mouse IFNγ (10 μg/mL) (both from Bio X Cell), anti-human PD-1 (pembrolizumab), and (S)-mepazine. Murine D4M.3A-derived tumor spheroids and MDOTS were cultured ex vivo with MPT-0308 (0.3-10 μM) for 4 days, and murine MC38-derived MDOTS were cultured with MPT-0308 (3 μM ± anti-mouse IFNγ) or anti-mouse IFNγ alone for 6 days. PDOTS established from patients with colorectal cancer (CRC) and melanoma were cultured ex vivo with MPT-0118 or MPT-0308 (3-5 μM [unless otherwise specified] ± anti-PD-1 [pembrolizumab]) for 5 to 7 days; one experiment additionally included each treatment plus or minus anti-human IFNγ.
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