Journal: Frontiers in immunology
Article Title: Beta-Defensin 2 and 3 Promote Bacterial Clearance of Pseudomonas aeruginosa by Inhibiting Macrophage Autophagy through Downregulation of Early Growth Response Gene-1 and c-FOS.
doi: 10.3389/fimmu.2018.00211
Figure Lengend Snippet: Figure 2 | Beta-defensins 2 (BD2) and beta-defensins 3 (BD3) suppressed autophagy in macrophages. (A–C) THP-1 macrophages were treated with recombinant human BD2 or BD3 or both peptides (1 µg/ml) for 6 h, and infected with Pseudomonas aeruginosa (PA) at multiplicity of infection 1 for 6 h. (D–G) RAW264.7 cells were transiently transfected with siBD2, siBD3, or both vs siNC for 24 h, and then infected with PA. (A,F) Cells were fixed, stained with anti- microtubule associated protein 1 light chain 3 (LC3) Alexa Fluro 488 fluorescent Ab, and then detected by immune fluorescence microscopy. Arrows indicate the LC3 puncta in THP-1 macrophages (A) and RAW264.7 cells (F). (B,G) Quantification of cells containing LC3 puncta in THP-1 macrophages (B) and RAW264.7 cells (G). (C,E) Protein levels of LC3-II were tested by western blot in THP-1 macrophages (C) and RAW264.7 cells (E). (D) The knockdown efficiency was tested by RT PCR. Data are shown as the mean ± SEM of three independent experiments (*p < 0.05; **p < 0.01; ***p < 0.001).
Article Snippet: Primary antibody against microtubule associated protein 1 light chain 3 (LC3) (REF NB910-40435, Novus Biologicals, Littleton, CO, USA), anti-β-actin (REF A1978, clone AC-15, Sigma-Aldrich, St. Louis, MO, USA), anti-Lamin B (REF sc-6216, clone B-10, Santa Cruz Biotechnology, CA, USA), anti-human betaDefensin 3 (REF AE1050, clone L3-18b-E1, Immundiagnostik), anti-human beta-Defensin 2 (REF AE1110, clone L12-4C-C2, Immundiagnostik, Produktion, Germany), anti-c-FOS (REF sc-52, clone E-4, Santa Cruz Biotechnology, CA, USA), and antiEGR1 (REF sc-189, clone C-19, Santa Cruz Biotechnology, CA, USA) were used in this study.
Techniques: Recombinant, Infection, Transfection, Staining, Fluorescence, Microscopy, Western Blot, Knockdown, Reverse Transcription Polymerase Chain Reaction