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7 protocols using fc blocking antibody

1

Isolation of Kidney Stromal Cells

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For tissue preparation, the obstructed kidney was minced and incubated with 2mg/mL collagenase II (Sigma), 1mL DMEM, and DNAse (BioRad 10ul/mL) in a shaker at 37C for 1 hour. The tissue was filtered (70 μm), centrifuged, and incubated in red blood cell lysis buffer (15.5mM NH4Cl, 1mM KHCO3, 10 μM EDTA) at 37C for 5 minutes, neutralized with PBS, centrifuged, and resuspended in PBS with 1%FBS. The tissue was passed through a 50 μM strainer, and tissue from COL-Cre mice (and controls) was passed through a 24 μM filter to remove the glomeruli. The FACSAria II from BD Biosciences in the Research Flow Cytometry Core Laboratory at the Nashville VA Medical Center was used for sorting of GFP+ cells.
For flow cytometry, samples were incubated with Fc blocking antibody (Biolegend) on ice, then incubated with APC-conjugated anti-F4/80, anti-CD140b (PDGFRβ), or the appropriate APC-conjugated isotype controls (Biolegend) for 30 minutes at room temperature. Cells were analyzed on a FACS Canto II cytometer with FACSDiVa v6.1 software for data acquisition and analysis at the Nashville VA Medical Center’s Flow Cytometry Laboratory.
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2

Lung Cell Isolation and Flow Cytometry

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BALF or lung single cell suspension was obtained after PBS, LPS or heated-P. aeruginosa i.n. instillation. Lung cells were collected by centrifugation and then incubated with Fc blocking antibody (purified anti-mouse CD16/32, BioLegend) on ice for 15 min. After the cells were stained with fluorescence-conjugated antibodies for 30 min on ice, the cells were washed and subjected to FACS (BD, FACSCelesta). The FACS data were analyzed using Flow Jo software (TreeStar,Inc). All antibodies used for flow cytometry were anti-mouse antigens.
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3

Tumor Dissociation and Flow Cytometry

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Tumor-bearing mice were euthanized, and resected tumors were shredded into small pieces and incubated in collagenase-containing buffer: collagenase type IV (100 U/ml; Invitrogen), deoxyribonuclease I (50 μg/ml; Roche), and 10% FBS in RPMI 1640 medium for 45 min. After incubation, cells were treated with RBC lysis buffer (Thermo Fisher Scientific) and passed through a 100-μm cell strainer to remove debris. The cell pellet was dissolved by 2% FBS in PBS and used for flow cytometry analysis. Isolated cells were initially stained with the LIVE/DEAD Fixable Dead Cell Stain Kit (Invitrogen). Cells were subsequently incubated with Fc-blocking antibody (BioLegend) and then stained with monoclonal antibodies for several surface and intracellular antigens as listed in Supplementary Methods. Foxp3/Transcription Factor Staining Buffer (eBioscience) was used for intracellular staining. Sample acquisition was performed on a BD FACSCanto II cytometer (BD Biosciences) equipped with Diva software and analyzed using FlowJo software (BD Biosciences). Antibody clone numbers for immune analysis are listed in the Supplementary Materials.
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4

Immunophenotyping of Cell Samples

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Cells were incubated with unlabeled isotype control antibody and Fc blocking antibody for 15 min (BioLegend, New Jersey, USA). After that, fluorescently coupled antibodies were added, and the cells were incubated on ice for 30 min. After washing with PBS, cells were analyzed on FACS Fortessa (Becton Dickinson, Franklin Lakes, New Jersey, USA) using FlowJo V.10.1 software (Tree Star, California, USA). Cell debris and dead cells were excluded by forward and side scatter gating and 7-amino-actinomycin D (BioLegend) staining.
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5

Isolation of Kidney Stromal Cells

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For tissue preparation, the obstructed kidney was minced and incubated with 2mg/mL collagenase II (Sigma), 1mL DMEM, and DNAse (BioRad 10ul/mL) in a shaker at 37C for 1 hour. The tissue was filtered (70 μm), centrifuged, and incubated in red blood cell lysis buffer (15.5mM NH4Cl, 1mM KHCO3, 10 μM EDTA) at 37C for 5 minutes, neutralized with PBS, centrifuged, and resuspended in PBS with 1%FBS. The tissue was passed through a 50 μM strainer, and tissue from COL-Cre mice (and controls) was passed through a 24 μM filter to remove the glomeruli. The FACSAria II from BD Biosciences in the Research Flow Cytometry Core Laboratory at the Nashville VA Medical Center was used for sorting of GFP+ cells.
For flow cytometry, samples were incubated with Fc blocking antibody (Biolegend) on ice, then incubated with APC-conjugated anti-F4/80, anti-CD140b (PDGFRβ), or the appropriate APC-conjugated isotype controls (Biolegend) for 30 minutes at room temperature. Cells were analyzed on a FACS Canto II cytometer with FACSDiVa v6.1 software for data acquisition and analysis at the Nashville VA Medical Center’s Flow Cytometry Laboratory.
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6

Quantifying Murine MDSC in Bone Marrow

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Multicolor flow cytometry (FCM) was performed to observe the percentage of MDSCs in the bone marrow of CRC mice. After being freed of muscles and tendons, the femurs and tibiae of mice were placed in 70% ethanol for 2 min and subsequently washed in PBS, then a syringe was used to flush bone marrow cells from the femurs and tibias with PBS. After red blood cells were lysed, flushing fluid was filtered through a 100-μm membrane to obtain suspension of single cells. Cells were incubated with Fc blocking antibody (BioLegend, 101319) for 15 min and then stained with fluorescence-conjugated antibodies of surface markers CD11b (clone M1/70, eBioscience, 11-0112-82) and Gr-1 (clone RB6-8C5, Biogems, 83122-80-25) for 30 min. The samples were detected by a BD FACS Aria Fusion Flow Cytometry Cell Sorter (BD Biosciences), and the data were analyzed using FlowJo v.9 software (FlowJo LLC).
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7

Comprehensive Immune Profiling of Tumor Cells

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Following tumor dissociation cells were stained with ZombieUV viability dye (Biolegend), before being resuspended in PBS + 1% BSA. Approximately 1x106 cells were aliquoted in 5 ml tubes and incubated with Fc Blocking antibody (Biolegend). Antibodies used for immune profiling are detailed in Supplementary file 1, and master mixes were prepared before incubation with cells. After washing, cells were fixed and permeabilised overnight using FoxP3/transcription factor staining buffer set following manufacturer’s instructions (eBiosceince, ThermoFischer), before staining with intracellular antibody master mixes. Finally, cells were washed before being acquired on BD LSR Fortessa (BD Biosciences). Gating and analysis of flow cytometry data was conducted using FlowJo (Version 10.8, Tree Star). Gating of major populations are demonstrated in Figure 2—figure supplement 1 and Figure 3—figure supplement 1. For immunophenotyping experiments, sample size was chosen to ensure biological differences could be determined, with minimum mice numbers to allow for collection and processing in one day. Samples were excluded if intracellular staining was unsuccessful.
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