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Image Search Results
Journal: Frontiers in Oncology
Article Title: Niraparib-induced STAT3 inhibition increases its antitumor effects
doi: 10.3389/fonc.2022.966492
Figure Lengend Snippet: NRP inhibits pSTAT3 and enhances cell apoptosis by regulating STAT3 downstream genes. (A) Western blot indicating levels of pSTAT3(Y-705) in MIA PaCa-2, PANC-1, OVCAR8, and PEO1 cells after NRP or DMSO treatment for 24h or 36 hours (PEO1). GAPDH or β-actin served as a loading control. Band intensities from two or three independent experiments were quantified by ImageJ and showed in a bar graph as mean ± SEM (B) Western blot indicating the level of pSTAT3(Y-705) in MIA PaCa-2 cells transfected with PARP1 siRNA for 2 days, followed by 24-hour NRP treatment. (C) Real-time PCR to examine changes of STAT3 downstream gene expression levels in MIA PaCa-2 and OVCAR8 cells with or without NRP treatment. Gene expression was normalized to the housekeeping gene 18S . Unpaired two-tailed Student t-test. The data shown are as mean ± SEM (N=3). *p<0.05, **p<0.001, ***p<0.0001. (D) NRP-induced apoptosis in MIA PaCa-2 and OVCAR8 cells was examined by Annexin V/PI staining and analyzed by flow cytometry 72h after indicated treatments. Unpaired two-tailed Student t-test. Data are shown as mean ± SEM (N=3). *p<0.05, ***p<0.0001. (E) STAT3C overexpression significantly rescued NRP-induced apoptosis. Mock vector or STAT3C-overexpressing MIA PaCa-2 or OVCAR8 cells were treated with NRP for 48h, followed by Annexin V-APC/PI and flow cytometry. Unpaired two-tailed Student t-test. Data are shown as mean ± SEM (N=3). ns, not significant. *p<0.05, ***p<0.0001. Total STAT3 levels in STAT3C-overexpressing cells were examined by Western blot. β-actin served as a loading control.
Article Snippet: MIA PaCa-2 cells were transfected with
Techniques: Western Blot, Control, Transfection, Real-time Polymerase Chain Reaction, Gene Expression, Two Tailed Test, Staining, Flow Cytometry, Over Expression, Plasmid Preparation
Journal: Frontiers in Oncology
Article Title: Niraparib-induced STAT3 inhibition increases its antitumor effects
doi: 10.3389/fonc.2022.966492
Figure Lengend Snippet: NRP treatment reduces pSTAT3 and pSRC in OvCa and PDAC patient tumor samples. (A) Western blot analysis of pSTAT3 and pSRC levels in OvCa patient primary tumor cells or ascites cells after 24h NRP treatment. β-actin served as a loading control. (B) Western blot analysis of levels of pSTAT3 and pSRC in PDAC-derived PDX tumor cells or PDAC patient primary tumor cells treated with NRP for 24h. β-actin served as a loading control. (C) Expression of pSTAT3 and pSRC in OvCa patient tumor slices treated with DMSO or NRP for 24h were examined by fluorescent immunohistochemistry and confocal microscopy. Representative images are shown from two OvCa patients. Red, pSTAT3; Green, pSRC; Magenta, pan-Cytokeratin; Blue/Hoechst 33342, nucleus. Cytokeratin-positive cell clusters demonstrate malignant tumor tissue. Scale bars = 20 μm. Histograms show quantification of M.F.I. of pSTAT3 and pSRC normalized to nuclear staining. Quantification was performed using ImageJ software, and at least five fields were quantified for each condition group. Data are presented as mean ± SEM. Unpaired two-tailed Student t-test, *p<0.05, ***p<0.001, ****p<0.001. (D) Niraparib induces tumor cell apoptosis through two mechanisms: Niraparib inhibits PARP, preventing DNA damage repairs in cells with BRCA mutations, thus causing tumor cell synthetic lethality. Our data show that Niraparib also interferes with SRC/STAT3 pathway to increase apoptosis of tumor cells with or without BRCA mutations.
Article Snippet: MIA PaCa-2 cells were transfected with
Techniques: Western Blot, Control, Derivative Assay, Expressing, Immunohistochemistry, Confocal Microscopy, Staining, Software, Two Tailed Test