Journal: The Journal of Clinical Investigation
Article Title: A tumor-intrinsic PD-L1/NLRP3 inflammasome signaling pathway drives resistance to anti–PD-1 immunotherapy
doi: 10.1172/JCI133055
Figure Lengend Snippet: (A) TCGA human melanoma database gene expression analysis of CXCL5, CXCL2, and CXCR2 association with WNT5A. (B) Whole tumor tissue Western blot analysis of Wnt5a, YAP1, CXCL5, and vinculin and β-actin (used as loading controls). Blot is representative of 3 independent experiments. (C) Plasma CXCL5 ELISA following anti–PD-1 Ab therapy versus IgG isotype control therapy in the transgenic BRAFV600E PTEN–/– melanoma model (n = 6). Data are representative of 3 independent experiments. (D) qRT-PCR analysis of Cxcl1, Cxcl2, and Cxcl5 in the BRAFV600E PTEN–/– melanoma cell line following treatment with rWnt5a versus vehicle control (n = 3). (E) Western blot analysis of YAP1 expression in total cellular lysates (top) and nuclear lysates (middle) following treatment of BRAFV600E PTEN–/– melanoma cells with rWnt5a at various time points. Bottom blot shows Wnt5a induction of CXCL5 with or without verteporfin (YAP inhibitor) or XAV939 (β-catenin inhibitor). Blots shown are representative of 3 independent experiments. UT, untreated or vehicle control. (F) qRT-PCR analysis of Cxcl5 in BRAFV600E PTEN–/– NTC and Wnt5a-silenced BRAFV600E PTEN–/– melanoma cells (BRAFV600E PTEN–/– Wnt5aKD). Blot shows secreted CXCL5 in BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD cells (n = 3). (G) IHC for CXCL5 (red) in BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD tumor cells. Images are representative of 3 tumors. White arrows indicate CXCL5+ tumor cells. Original magnification, ×20. (H) IHC for Gr-1 in BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD tumor cells. Original magnification, ×20. Plots show PMN-MDSC flow cytometric analysis of BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD tumors (n = 3). (I) PMN-MDSC flow cytometric analysis of BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD tumors following treatment with anti–PD-1 Ab versus IgG isotype control (n = 5). (J) Tumor volume change based on anti–PD-1 Ab/IgG control ratios for BRAFV600E PTEN–/– NTC and BRAFV600E PTEN–/– Wnt5aKD tumors (n = 5). α, anti. UT, untreated control. Kendall’s tau correlation coefficient was calculated for A. *P < 0.05 and ***P < 0.0005, by Student’s t test (C, D, and I) and 1-way ANOVA with Sidak’s post hoc multiple comparisons test (F). See also Supplemental Figure 3.
Article Snippet: The following Abs were used: anti–β-actin, mouse mAb (Santa Cruz Biotechnology, sc-47778); anti-NLRP3, rabbit mAb (Cell Signaling Technology, 15101S); anti-ASC, mouse mAb (Santa Cruz Biotechnology, sc-514414); anti–caspase-1 p20, mouse mAb (Adipogen, AG-20B-0042-C100); anti–caspase-3, rabbit polyclonal Ab (Cell Signaling Technology, 9662S); anti-HSP70, mouse mAb (Santa Cruz Biotechnology, sc-66048); anti-CXCL5, goat polyclonal Ab (R&D Systems, AF433); anti-CXCL5, rabbit polyclonal Ab (LSBio, LS-c293780); anti–YAP/TAZ, rabbit mAb (Cell Signaling Technology, 8418S); anti-Wnt5a, mouse mAb (Santa Cruz Biotechnology, sc-365370); anti-GAPDH, mouse mAb (Santa Cruz Biotechnology, sc-32233); CD8a, rabbit mAb (Cell Signaling Technology, 989415); InVivoMAb anti–human PD-L1 Ab (Bio X Cell, BE0285); InVivoMAb anti–mouse PD-L1 Ab (Bio X Cell, BE0101); InVivoMAb anti–mouse PD-1 Ab (Bio X Cell, BE0146); InVivoMAb rat IgG2a isotype control Ab, clone: 2A3 (Bio X Cell, BE0089); anti–mouse CD8 Ab from hybridoma, (Duke Cell Culture Facility, clone 53.6.7); anti-OVA Ab (Santa Cruz Biotechnology, sc-65984); anti–IL-1β, mouse mAb (Cell Signaling Technology, 12242); anti–LY6G–Gr1 Ab (Abcam, ab25377); goat anti–rat IgG H&L Ab (MilliporeSigma, AP136P).
Techniques: Expressing, Western Blot, Enzyme-linked Immunosorbent Assay, Transgenic Assay, Quantitative RT-PCR