anti human stat1  (Cell Signaling Technology Inc)

Journal: Frontiers in Immunology

Article Title: IFNγ-induced antigen loss in chimeric antigen receptor-T cell therapy

doi: 10.3389/fimmu.2026.1772472

Figure Lengend Snippet: CART-induced GUCY2C loss is mediated by the IFNγ-JAK-STAT1 signaling axis. (A) LS174T cells and orthogonal approaches of cytokine screening (B) and confirmation (C) , IFNγ neutralizing antibody (D) , pharmacologic JAK1/2 blockade with ruxolitinib (E) , and JAK1/2 genetic knockout (F) were used to define the role of the IFNγ-JAK-STAT signaling axis in GUCY2C loss. (B) LS174T cells were treated with GM-CSF (20 ng/mL), TNFα (1 ng/mL), IL-8 (2 ng/mL), MIP-1α (2 ng/mL), MIP-1β (2 ng/mL), or IFNγ (15 ng/mL) for 48 hours, and GUCY2C protein levels were quantified. (C) LS174T cells were treated with 150 ng/mL IFNγ for 48 hours, and pSTAT1 and GUCY2C protein levels were quantified. (D–F) LS174T cells were treated with conditioned media (CM) for 48 hours from control or anti-CD3/CD2/CD28 bead-activated T cells, and pSTAT1 and GUCY2C protein levels were quantified; (D) 13 μg/mL anti-IFNγ neutralizing antibody was included in some conditions; (E) 2.5 μM ruxolitinib was included in some conditions; (F) LS174T cell pools previously treated with control CRISPR/Cas9 or JAK1 + 2 CRISPR/Cas9 were used. Each data point in (B–F) represents average of biological replicates from separate experiments (N = 3–4 experiments). In (C–F) , pSTAT, GUCY2C, and housekeeping control were examined on the same blot. The housekeeping protein is shown only below GUCY2C. A paired t-test was used to compare the two conditions in (C) ; in (B) and (D–F) , one-way ANOVA was used to compare each condition to the control treatment, and additional comparisons are indicated by bars; ns = p > 0.05, * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001. Figure schematics were generated using BioRender.com .

Article Snippet: Membranes were probed using an anti-human GUCY2C antibody (37517, Cell Signaling Technology), anti-human GAPDH (2118S, Cell Signaling Technology), anti-human STAT1 (14994T, Cell Signaling Technology), anti-human phospho-STAT1 (9167S, Cell Signaling Technology), anti-human CHOP (2895S, Cell Signaling Technology), anti-human β-actin (2128S, Cell Signaling Technology), anti-human EpCAM (2929S, Cell Signaling Technology) anti-human CDH17 (88594T, Cell Signaling Technology), and anti-human HER2 (2165T, Cell Signaling Technology).

Techniques: Knock-Out, Control, CRISPR, Generated

Journal: bioRxiv

Article Title: IFN-I exacerbates the inflammatory response of epithelial cells to Chlamydia trachomatis infection by enhancing TLR3 expression

doi: 10.64898/2025.12.08.692940

Figure Lengend Snippet: PI3K/AKT-mTOR but not STAT1 signaling pathways downstream of IFN-I are implicated in the synergy between IFN-I and C. trachomatis . (A) HeLa cells were incubated with IFNβ and/or C. trachomatis for 24 h followed by the detection of activation and expression of STAT1 via immunoblot. The results are representatives of three independent experiments. (B) siRNA against STAT1 or irrelevant oligonucleotides were transfected into HeLa cells for 24 h prior to incubation with IFNβ alone (left graph) or with IFNβ and C. trachomatis (right graph). The transcriptional level of STAT1 (left graph) was measured by real-time RT-qPCR and normalized to actin transcript following the 2 -ΔΔCt method. The data are presented as relative mRNA levels compared to untreated cells and shown as the mean±SE with individual values of three experiments. P-value of Student’s unpaired t-test is shown (* for p < 0.05). Intracellular IL6 protein (right panel) was determined by flow cytometry using anti-human IL6-PC7 antibody. The results of four independent experiments are shown. C-D) HeLa cells were pre-incubated with wortmannin (5 μM) (C) or SB203580 (10 μM) (D) for 1 h. Cells were then treated with IFNβ and/or C. trachomatis for 24 h in the presence of these inhibitors prior to brefeldin A addition for 6 h. Intracellular IL6 expression was analyzed by flow cytometry using anti-human IL6-PC7 antibody. The histograms are the representatives of two (C) or four experiments (D), respectively. The results of the four independent experiments are shown as a violin plot in (D), with p-value of a Student’s unpaired t-test (* for p< 0.05). (E) Same as in D using mTOR inhibitors, rapamycin and torin1 (1 μM). The results of five independent experiments and p-value of a Student’s unpaired t-test are shown (* for p< 0.05). (F) HeLa cells were treated with pharmacological inhibitors (upper panels) or transfected with siRNA (lower panel) as described above, followed by IFNβ and/or C. trachomatis treatment for 24 h. TLR3 transcripts was measured by rea-time RT-qPCR as above. Data from three independent experiments and p-values of Student’s unpaired t-test are shown (* p< 0.05, ** p<0.01, *** p<0.001 and **** p<0.0001). (G) The cells were incubated with SB203580 (10 μM) for 1 h before addition of IFNβ for 30 min. Phosphorylation of mTOR, AKT and p38 was detected by immunoblot. The results are representatives of three independent experiments.

Article Snippet: Primary antibodies used were rabbit anti-human STAT1 (#9172), Erk (#4695), p38 (#9212), AKT (#9272), rabbit anti-human phosphorylated STAT1 (#9167), Erk (#4370), p38 (#9215), AKT (#9275) and mTOR (#2971), which were purchased from Cell Signaling, rabbit antibodies against the heat shock protein 60 of Chlamydia (obtained by the lab), and mouse anti-human β-actin (Sigma, #A5441).

Techniques: Protein-Protein interactions, Incubation, Activation Assay, Expressing, Western Blot, Transfection, Quantitative RT-PCR, Flow Cytometry, Phospho-proteomics

Journal: bioRxiv

Article Title: IFN-I exacerbates the inflammatory response of epithelial cells to Chlamydia trachomatis infection by enhancing TLR3 expression

doi: 10.64898/2025.12.08.692940

Figure Lengend Snippet: PI3K/AKT-mTOR but not STAT1 signaling pathways downstream of IFN-I are implicated in the synergy between IFN-I and C. trachomatis . (A) HeLa cells were incubated with IFNβ and/or C. trachomatis for 24 h followed by the detection of activation and expression of STAT1 via immunoblot. The results are representatives of three independent experiments. (B) siRNA against STAT1 or irrelevant oligonucleotides were transfected into HeLa cells for 24 h prior to incubation with IFNβ alone (left graph) or with IFNβ and C. trachomatis (right graph). The transcriptional level of STAT1 (left graph) was measured by real-time RT-qPCR and normalized to actin transcript following the 2 -ΔΔCt method. The data are presented as relative mRNA levels compared to untreated cells and shown as the mean±SE with individual values of three experiments. P-value of Student’s unpaired t-test is shown (* for p < 0.05). Intracellular IL6 protein (right panel) was determined by flow cytometry using anti-human IL6-PC7 antibody. The results of four independent experiments are shown. C-D) HeLa cells were pre-incubated with wortmannin (5 μM) (C) or SB203580 (10 μM) (D) for 1 h. Cells were then treated with IFNβ and/or C. trachomatis for 24 h in the presence of these inhibitors prior to brefeldin A addition for 6 h. Intracellular IL6 expression was analyzed by flow cytometry using anti-human IL6-PC7 antibody. The histograms are the representatives of two (C) or four experiments (D), respectively. The results of the four independent experiments are shown as a violin plot in (D), with p-value of a Student’s unpaired t-test (* for p< 0.05). (E) Same as in D using mTOR inhibitors, rapamycin and torin1 (1 μM). The results of five independent experiments and p-value of a Student’s unpaired t-test are shown (* for p< 0.05). (F) HeLa cells were treated with pharmacological inhibitors (upper panels) or transfected with siRNA (lower panel) as described above, followed by IFNβ and/or C. trachomatis treatment for 24 h. TLR3 transcripts was measured by rea-time RT-qPCR as above. Data from three independent experiments and p-values of Student’s unpaired t-test are shown (* p< 0.05, ** p<0.01, *** p<0.001 and **** p<0.0001). (G) The cells were incubated with SB203580 (10 μM) for 1 h before addition of IFNβ for 30 min. Phosphorylation of mTOR, AKT and p38 was detected by immunoblot. The results are representatives of three independent experiments.

Article Snippet: Primary antibodies used were rabbit anti-human STAT1 (#9172), Erk (#4695), p38 (#9212), AKT (#9272), rabbit anti-human phosphorylated STAT1 (#9167), Erk (#4370), p38 (#9215), AKT (#9275) and mTOR (#2971), which were purchased from Cell Signaling, rabbit antibodies against the heat shock protein 60 of Chlamydia (obtained by the lab), and mouse anti-human β-actin (Sigma, #A5441).

Techniques: Protein-Protein interactions, Incubation, Activation Assay, Expressing, Western Blot, Transfection, Quantitative RT-PCR, Flow Cytometry, Phospho-proteomics

Journal: eLife

Article Title: JAK inhibition decreases the autoimmune burden in Down syndrome

doi: 10.7554/eLife.99323

Figure Lengend Snippet:

Article Snippet: Antibody , Rabbit monoclonal anti-human phospho-STAT1 (Tyr701) (clone 58D6) , Cell Signaling Technology , Cat # 9167; RRID: AB_561284 , Lot 22, 1:400.

Techniques: Isolation, Biomarker Discovery, Staining, Antibody Labeling, Software, Sequencing