Journal: The Journal of Clinical Investigation
Article Title: TNFSF13 insufficiency disrupts human colonic epithelial cell growth and associated B cell dynamics
doi: 10.1172/JCI186032
Figure Lengend Snippet: Percentage of FAS + and HVEM + cells by flow cytometry at day 7 after seeding in ( A ) colonoids ( n = 3 patient lines for control and VEO-IBD; n = 3 passages for variant) or ( B ) iPSC-organoids ( n = 3 passages per line). ( C ) Representative Western blot for FAS from coimmunoprecipitation supernatant in control and VEO-IBD colonoids at day 7. TNFSF13 antibody used for capture. Protein ladder lane (M) not shown in overlay ( n ≥ 4 patient lines for control and VEO-IBD). ( D ) SPR binding analyses of FASL-FAS (upper) and TNFSF13-FAS (lower) interactions at various concentrations ( n = 3 independent experiments). ( E ) Costaining of TNFSF13 and FAS RNAscope probes in control colonoids at day 7. Arrows indicate coexpression (scale bar: 100 μm; n = 3 experiments). ( F ) Co staining of TNFSF13 and FAS RNAscope probes with Ki67 antibody in control colonoids at day 7. Arrows indicate triple-positive cells (scale bar: 100 μm; n = 3 experiments). ( G ) Costaining of TNFSF13 and FAS RNAscope probes with FABP2 antibody in control colonoids at day 7. Arrows indicate triple-positive cells (scale bar: 100 μm; n = 3 experiments). ( H and I ) Percentage of EdU+ cells in control colonoids (left) or WT iPSC-organoids (right) at day 7 following treatment with ( H ) IgG or FAS neutralizing antibody (nFAS) or ( I ) IgG or recombinant human FAS ligand (rFASL). Two-way ANOVA with multiple comparisons for ( A and B ); 2-tailed Student’s t test for ( H and I ). P values shown unless P > 0.05.
Article Snippet: To evaluate the function of TNFSF13 in B cells, recombinant Human TNFSF13 (HEK293-expressed) protein (Cat #5860-AP-010, R&D Systems, Minnesota, USA) at a varying concentration gradient (0, 0.0005, 0.001, 0.005, 0.01, 0.05, 0.1, 0.2, 0.5, 1, 1.5, 2 μg/mL) was added at 4h post plating.
Techniques: Flow Cytometry, Control, Variant Assay, Western Blot, Binding Assay, RNAscope, Staining, Recombinant