Fig. 4 Expression of cleaved caspase 3, PD-L1, and PD-1 in HGGs after reovirus treatment. Expression of cleaved caspase 3, PD-L1, and PD-1 in HGGs after.

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Fig. 4 Expression of cleaved caspase 3, PD-L1, and PD-1 in HGGs after reovirus treatment. Expression of cleaved caspase 3, PD-L1, and PD-1 in HGGs after reovirus treatment. (A) Representative trial and control patient HGG sections stained for cleaved caspase 3 (brown) by IHC. Scale bars, 60 μm. (B) Representative trial and control patient HGG sections stained by IHC for programmed death ligand 1 (PD-L1) (brown). Scale bars, 30 μm. (C) Representative (one of three samples tested) flow cytometry for PD-L1 on GBM tumor-infiltrating lymphocytes (TILs) (bottom) or peripheral blood mononuclear cells (PBMCs) (top) derived from the same patient, after stimulation for 48 hours using 1 plaque-forming unit per cell reovirus. PBS, phosphate-buffered saline; Ab, antibody. (D) Representative trial and control patient HGG sections stained by IHC for programmed cell death protein 1 (PD-1) (brown). Scale bars, 30 μm. (E) Representative flow cytometry for PD-L1 on GBM1 cells after stimulation with combinations of purified interferon (IFN)–α/IFN-β/IFN-γ for 24 hours, each at 100 pg/ml. (F) Representative flow cytometry for PD-L1 on GBM1 cells after stimulation with ex vivo HGG-derived conditioned medium (CM) or reovirus-conditioned medium (RCM) for 24 hours (at a concentration of 1:4 of CM to native medium). (G) Representative flow cytometry for PD-L1 on GBM1 cells after stimulation using PBMC-derived CM or RCM for 24 hours (at a concentration of 1:4 of CM to native medium) with blockade of IFN-α+β/γ/α+β+γ or equivalent isotype controls. Adel Samson et al., Sci Transl Med 2018;10:eaam7577 Published by AAAS