Project description:Paraffin-embedded lung and spleen tissues analyzed by Eksigent nanoLC-Ultra 2D System and QExactive mass spectrometer. Both lung and spleen tissues were extracted from animals at 4 different conditions (Not infected Ad libitum, Not infected Caloric restricted, Mycobacterium Tuberculosis (MTB) infected Ad libitum, Mycobacterium Tuberculosis (MTB) infected Caloric restricted). Globally, 24 and 23 runs are uploaded for lung and spleen tissues, respectively.
Project description:Control of Mycobacterium tuberculosis infection requires generation of T cells that migrate to granulomas, complex immune structures surrounding sites of bacterial replication. Here we compared the gene expression profiles of T cells in pulmonary granulomas, bronchoalveolar lavage and blood of Mtb-infected rhesus macaques to identify granuloma-enriched T cell genes. TNFRSF8/CD30 was among the top genes that was upregulated in both CD4 and CD8 granuloma T cells and independent of bacterial loads. Transcriptomic profiling of lung T cells from Mtb-infected mixed bone marrow chimeric mice showed that CD30 directly promotes CD4 T cell differentiation and effector molecule expression. Moreover, in mice CD30 expression on CD4 T cells is required for survival of Mtb infection. These results show the CD30 co-stimulatory axis is highly upregulated on granuloma T cells and is critical for the generation of protective T cell responses against Mtb infection.
Project description:To describe the protein profile in hippocampus, colon and ileum tissue’ changing after the old faeces transplants, we adopted a quantitative label free proteomics approach.
Project description:Introgressed variants from other species can be an important source of genetic variation because they may arise rapidly, can include multiple mutations on a single haplotype, and have often been pretested by selection in the species of origin. Although introgressed alleles are generally deleterious, several studies have reported introgression as the source of adaptive alleles-including the rodenticide-resistant variant of Vkorc1 that introgressed from Mus spretus into European populations of Mus musculus domesticus. Here, we conducted bidirectional genome scans to characterize introgressed regions into one wild population of M. spretus from Spain and three wild populations of M. m. domesticus from France, Germany, and Iran. Despite the fact that these species show considerable intrinsic postzygotic reproductive isolation, introgression was observed in all individuals, including in the M. musculus reference genome (GRCm38). Mus spretus individuals had a greater proportion of introgression compared with M. m. domesticus, and within M. m. domesticus, the proportion of introgression decreased with geographic distance from the area of sympatry. Introgression was observed on all autosomes for both species, but not on the X-chromosome in M. m. domesticus, consistent with known X-linked hybrid sterility and inviability genes that have been mapped to the M. spretus X-chromosome. Tract lengths were generally short with a few outliers of up to 2.7 Mb. Interestingly, the longest introgressed tracts were in olfactory receptor regions, and introgressed tracts were significantly enriched for olfactory receptor genes in both species, suggesting that introgression may be a source of functional novelty even between species with high barriers to gene flow.
Project description:Histones were isolated from brown adipose tissue and liver from mice housed at 28, 22, or 8 C. Quantitative top- or middle-down approaches were used to quantitate histone H4 and H3.2 proteoforms. See published article for complimentary RNA-seq and RRBS datasets.
Project description:We report the application of RNA sequencing to assess the expression dynamics of miRNAs and their isoforms over time upon infection with a panel of six intracellular bacteria (Mycobacterium tuberculosis H37Rv, Mycobacterium tuberculosis Beijing strain GC1237, Mycobacterium bovis BCG, Salmonella typhimurium strain Keller, Staphloccocus epidermidis and Yersinia pseudotuberculosis)
Project description:Mycobacterium tuberculosis (Mtb) primarily resides in the lung but it can also persist in extrapulmonary sites. Macrophages are considered the prime cellular habitat in all tissues. Here we demonstrate that Mtb resides inside adipocytes of fat tissue where it expresses stress-related genes. In addition, Mtb infection induces changes in adipose tissue biology depending on the route of administration and stage of infection. At day 14 post-systemic Mtb infection, F4/80+ (inducible nitric oxide synthase-positive) iNOS+ cells (M1 macrophages) as well as CD3, CD4 and CD8 T cells were present, and by day 28, B220+ cells had arrived in adipose tissue. In contrast, mice infected via aerosol only showed infiltration of F4/80+ cells that do not express iNOS or arginase 1 (Arg1) and CD3, CD4 and CD8 T cells. Gene expression analysis of adipose tissue of aerosol Mtb-infected mice provided evidence for upregulated expression of genes associated with T cells and NK cells at 28 days post-infection. Moreover, IFN-gamma-producing NK cells and Mtb-specific CD8 T cells were found in perigonadal fat, specifically CD8+CD44-CD69+ and CD8+CD44-CD103+ subpopulations. Gene expression analysis of selected NK cells and Mtb-specific CD8 T cells in perigonadal fat of infected mice revealed that they produced IFN-gamma and transcribed the lectin-like receptor Klrg1 whereas CD27 and CD62L transcript levels were downregulated consistent with an effector phenotype. Sorted NK cells expressed higher levels of Klrg1 upon infection, as well. Our results reveal the ability of Mtb to persist in adipose tissue in a stressed state, and that NK cells and Mtb-specific CD8 T cells infiltrate infected adipose tissue where they produce IFN- and assume an effector phenotype. We conclude that Mtb exploits adipose tissue as niche, to which CD8 T cells and NK cells are attracted.
2017-10-12 | GSE83554 | GEO
Project description:Mycobacterium tuberculosis system biology