Journal: JCI Insight
Article Title: TET2 promotes tumor antigen presentation and T cell IFN- γ , which is enhanced by vitamin C
doi: 10.1172/jci.insight.175098
Figure Lengend Snippet: The expression level of key MHC I antigen presentation genes TAP1 ( A ), TAPBP ( B ), B2M ( C ), and HLA-A ( D ) and their correlation with patient survival predictions were summarized in different human cancer types. Data collected from the Kaplan-Meier Plotter database, with HR indicating hazard ratio and logrank P indicating P value. Human cancer tissue was purchased from Biomax (Methods) and stained for 5hmC, TAP1, TAPBP, B2M, and with DAPI for immunofluorescence imaging in malignant melanoma ( E ) and colon adenocarcinoma ( F ). Scale bars: 100 μm. White boxes show ×20 magnification. The relative density of 5hmC, TAP1, TAPBP, and B2M relative to DAPI was calculated from at least 6 replicates under enlarged fields. Unpaired, 2-tailed Student’s t test with multiple comparisons corrected using Bonferroni’s method was used to determine the P value of positive cells between 5hmC-high samples and 5hmC-low samples. **** P < 0.0001. ( G ) Schematic model of the role of TET2 downstream of IFN-γ signaling and VC in regulating tumor antigen presentation and T cell activity directed to the tumor cell.
Article Snippet: The following antibodies were used in this study: GAPDH (GeneTex, 110118), IgG (Cell Signaling Technology [CST], 3900S), TET1 (Abcam, ab191698), TET2 (CST, 18950S), TET3 (CST, 99980S), NF-κB (p65) (CST, 8242S), STAT1 (CST, 9172S), 5hmC (Active Motif, 39769), 5mC (Active Motif, 61479), 5hmC (CST, 51660S), B2M (CoraLite 488, Proteintech, CL488-13511), TAPBP (LS Bio, LS-B9746-GOS10-100), TAP1 (Proteintech, 11114-1-AP), CD3 Alexa Fluor 700 (Invitrogen, MHCD0324), CD4 PE-Cyanine7 (Invitrogen, MHCD0412), CD8 PE-Alexa Fluor 610 (Invitrogen, MHCD0822), CD69 Super Bright 645 (eBioscience, 64-0691-82), CD25 Bright 436 (eBioscience, 62-0251-82), CD11c FITC (eBioscience, 11-0114-82), and PE-anti–mouse H-2Kb bound to SIINFEKL (Invitrogen, 12-5743-82).
Techniques: Expressing, Immunopeptidomics, Staining, Immunofluorescence, Imaging, Activity Assay