Journal: The Journal of Experimental Medicine
Article Title: Intercrypt sentinel macrophages tune antibacterial NF-κB responses in gut epithelial cells via TNF
doi: 10.1084/jem.20210862
Figure Lengend Snippet: TNF produced by CD11c + cells induces local epithelial NF-κB activation in the intestinal mucosa. (A and B) p65 GFP-FL intestinal epithelial organoids established from the indicated regions were treated with 5, 50, and 500 ng/ml or 5 µg/ml LPS (+ LBP and CD14, if indicated) and imaged for 1 h (A; n = 3–17), or analyzed by qPCR at 3 h of treatment (B and C; n = 6 or 7). (C) Colon organoids from p65 GFP-FL x Tlr4 −/− mice ( n = 4). (D) Representative two-photon microscopy overview image of the cecal mucosa of mice described in at 1 h.p.inj. of LPS ( n = 6). Red squares indicate RFP + ( Tlr4 +/+ ) cells. White lines indicate IEC NF-κB activation zones (defined as areas with continuous epithelial NF-κB activation). (E) Quantification of epithelial NF-κB activation in Il18 −/− > p65 GFP-FL x Tlr4 −/− , Il18r −/− > p65 GFP-FL x Tlr4 −/− , and Il1ab −/− > p65 GFP-FL x Tlr4 −/− BMCs at 1 h.p.inj. of LPS ( n = 7 or 8). (F) p65 GFP-FL intestinal epithelial organoids from cecum (left) or colon (right) were treated with 5, 50, and 500 ng/ml TNF and imaged for 1 h ( n = 3–17). (G) Quantification of epithelial NF-κB activation in mice as described in . Mice pretreated with DTX were injected with PBS or TNF ( n = 2–6). Cecae were imaged at 1 h.p.inj. Data of LPS-injected mice are replotted from for comparison. Black line: median (B, C, E, and G). Dashed line: detection limit (C and G) or error range (A and F). Each circle represents one organoid sample (B and C), one mouse (E and G), or the median (A and F). Statistical analysis: one-way ANOVA with Dunett’s correction (B and C) or Mann–Whitney U test (E and G). *, P ≤ 0.05; **, P ≤ 0.01. Scale bars: 50 µm. Combined data of two (A, small intestine; B, C, D, and F, cecum), three (A, cecum), four (F, colon), six (B and E), or eight (A, colon) independent experiments.
Article Snippet: TLR4 , BioRad , MCA2154T.
Techniques: Produced, Activation Assay, Microscopy, Injection, Comparison, MANN-WHITNEY