Journal: Genes and Immunity
Article Title: The epigenomic landscape of bronchial epithelial cells reveals the establishment of trained immunity
doi: 10.1038/s41435-025-00357-z
Figure Lengend Snippet: A On day -1 (D-1), BEAS-2B cells were cultured in 96-well plates (1.5 × 104 cells/well). On day (D0), the cells (2.8 × 104 cells/well) were prestimulated (F) (red arrow) or not (Ctl) (grey arrow) with 5 µg/mL ultrapure flagellin (InvivoGen) from Pseudomonas aeruginosa for 48 h. The cells were then washed twice with media on day 2 (D2 and D2F), followed by a resting period of 4 days, until they reached confluence (10.3 × 104 cells/well) on day 6 (D6 and D6F). RNA and DNA were extracted at days 0, 2, and 6 from BECs exposed (F) or not exposed (Ctl) to flagellin and then analysed via microarray and ATAC sequencing. In parallel experiments, to validate the trained response, BECs prestimulated with or without flagellin were infected with A. fumigatus (MOI of 2) for 15 h (dotted lines) on day 6. B Transcriptomic and epigenomic dynamics were analysed by differential analysis between days 2 and 6 vs . day 0 in BECs exposed to flagellin (F) or not exposed (Ctl). Accessible regions and genes undergoing significant expression changes were then jointly classified using an unsupervised machine learning approach to identify clusters with common regulatory profiles. The latter were functionally characterised by gene set enrichment analysis and transcription factor footprinting. D: day, F: P. aeruginosa flagellin, Ctl: control. Created with BioRender.com.
Article Snippet: Human BECs (BEAS-2B cell line; American Type Culture Collection, Rockville, MD, USA) were maintained at 37 °C and 5% CO 2 in F12 medium (Invitrogen, Waltham, MA, USA) supplemented with 10% foetal calf serum, 1% penicillin‒streptomycin, and 10 mM HEPES and stimulated in F12 without antibiotics.
Techniques: Cell Culture, Microarray, Sequencing, Infection, Expressing, Footprinting, Control