Journal: Microbiology Spectrum
Article Title: Novel Requirement for Staphylococcal Cell Wall-Anchored Protein SasD in Pulmonary Infection
doi: 10.1128/spectrum.01645-22
Figure Lengend Snippet: SasD increases macrophage inflammation and decreases survival. (A and B) RAW264.7 macrophages were infected with WT or sasD A50.1 MRSA for 3 h at an MOI of 10. Macrophages were infected for 1 h in the absence of antibiotics; the medium was then replaced with antibiotic- and serum-free medium with or without gentamicin for 1 h and changed to antibiotic free medium. CFU and transcript graphs are shown without gentamicin conditions. (A) Bacterial burden and percent phagocytosed bacteria in RAW264.7 macrophages. The percent phagocytosed bacteria is calculated by the following equation: ([average CFU with gentamicin]/[average CFU without gentamicin]) · 100. (B) Gene expression in RAW264.7 macrophages infected with WT or sasD A50.1 MRSA for 3 h. (C to F) Bone marrow-derived macrophages (BMDMs) were infected with WT or sasD A50.1 MRSA for 3 h at an MOI of 50 in the absence of antibiotics. C. Viability measured by trypan blue staining of BMDMs 3 h postinfection. (D and E) Representative images (D) and quantification of Western blot analyses (E) of BMDM levels of IL-1β and caspase 1. One to three wells were combined per sample, and protein levels are normalized to beta actin in each sample. Arrows denote which band was used for quantification. (F) Gene expression in BMDM macrophages infected with WT or sasD A50.1 MRSA for 3 h. Statistics were tested by Mann-Whitney test. *, P < 0.05; ***, P < 0.001. N = 4 to 7; combination of several experiments; data graphed as mean ± SEM.
Article Snippet: BMDM viability was determined using trypan blue (Gibco) staining and the Countess 3 automatic cell counter (Invitrogen).
Techniques: Infection, Bacteria, Gene Expression, Derivative Assay, Staining, Western Blot, MANN-WHITNEY