Finally, plates were read using a microplate ELISA reader (Spectramax M5, Molecular Devices, Sunnyvale, CA, USA) at 450 nm and soft Max Pro 5 software (Molecular Devices) with a cutoff of 0.1 absorbance value. Spleen and lung cells

(1 × 106 cells/well) were seeded into 24-well tissue culture plates in 500 μL of RPMI-1640 medium supplemented with 10% FBS, 25mM Na-HEPES, 2 mM l-glutamine, 1 mM sodium pyruvate, 100 U/mL penicillin, and 100 U/mL streptomycin, and subsequently treated with 5 μg/mL M. tuberculosis WCL at 37°C with 5% CO2. After 72 h, cell-free culture supernatant was collected and analyzed for INF-γ and IL-2, by ELISA (eBioScience) according to the manufacturer’s instruction. Six weeks after the M. tuberculosis learn more infection, small sections of the

www.selleckchem.com/products/Adrucil(Fluorouracil).html right and left lung, removed prior to harvesting the tissue for CFU determination, were fixed in 10% neutral buffered formalin (Fisher Scientific, Fair Lawn, NJ, USA) at room temperature overnight, and then embedded in paraffin (Leica, Richmond, IL, USA). The sections were taken at 4 μm thickness and stained with H&E for microscopic analysis. To determine histopathological changes, all sections were scored for severity by scanning entire fields in three sections of each tissue per mouse based on the extent of granulomatous inflammation as described [32]: 0 = no lesion, 1 = minimal lesion (1–10% area of tissue in section involved), 2 = mild lesion (11–30% area involved), 3 = moderate lesion (31–50% area involved), 4 = marked lesion (50–80% area involved), 5 = severe lesion (>80% area involved). The data obtained was analyzed by ANOVA and Student paired t-test. Differences between means were assessed for significance by Tukey’s test. A value of p ≤ 0.05 was considered significant. Acesulfame Potassium The

computer program GraphPad PRISM 5 was used for the analysis. This work was supported through the grant RO1AI052439 from the National Institute of Allergy and Infectious Diseases. We thank the University of Notre Dame’s Histology Core for the processing and staining of the tissue samples. The authors declare no financial or commercial conflict of interest. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. “
“Department of Infectious Diseases, Oslo University Hospital – Ulleval, Oslo, Norway Top Institute Food and Nutrition, Wageningen, The Netherlands Innate and adaptive mucosal defense mechanisms ensure a homeostatic relationship with the large and complex mutualistic gut microbiota.