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2 protocols using muc1 cd227 fitc

1

Characterization of Tumor Cell Surface and Intracellular Antigens

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Cell-surface and intracytoplasmic staining was performed as previously described [47 (link)]. Surface staining of tumor cells was performed using the primary labeled monoclonal antibodies HLA-A2-FITC, ICAM-1 (CD54)-PE, CEA (CD66)-FITC, MUC1 (CD227)-FITC, and the appropriate isotype-matched controls (BD Biosciences). For intracellular analysis of antigen processing machinery (APM) components, mouse IgG1 (MK2-23) isotype control, LMP2 (SY-1)-, LMP7 (HB2)-, TAP-1 (NOB1), calnexin (TO-5)-, β2-microglobulin (L368), and tapasin (TO-3)-specific monoclonal antibodies were developed and characterized as described [48 (link)-50 (link)]. Cellular fluorescence of 3×104 cells was examined on a FACSCalibur flow cytometer using CellQuest software (BD Biosciences). Proteins were scored as markedly upregulated if confirmed statistically and if detection levels and/or mean fluorescence intensity (MFI) increased ≥ 25% following treatment and were not observed in control cells vs. isotype controls.
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2

Flow Cytometry Analysis of Irradiated Tumor Cells

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At 96 h post-irradiation, tumor cells were examined by flow cytometry, as previously described [13 (link)]. Cells were examined on FACSCalibur or FACSVerse cytometers, using the monoclonal antibodies targeting HLA-ABC-FITC, HLA-ABC-PE-Cy7, ICAM-1 (CD54)-PE, CEA (CD66)-FITC, MUC-1 (CD227)-FITC, CD24-PerCP-Cy5.5, CD44-FITC, and the appropriate isotype-matched controls (BD Biosciences, San Jose, CA). The monoclonal antibodies targeting CD70-FITC, CD275 (ICOSL)-PE, CD137L (4-1BBL)-PE, CD252 (OX40L)-PE, PD-L1 (CD274)-PE, CTLA-4 (CD152)-PE, and CD227 (MUC-1)-PE were obtained from BioLegend (San Diego, CA). Antibodies targeting CD133-APC (Miltenyi Biotec, San Diego, CA) and calreticulin-PE (R&D Systems, Minneapolis, MN) were also used. Isotype control staining was < 5% for all samples analyzed. Viability was examined using LIVE/DEAD Fixable Violet Dead Stain Kit (Thermo Fisher Scientific, Rockville, MD). Cell surface expression was evaluated on live cells gated by FSC/SSC and LIVE/DEAD staining.
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