Project description:Gene expression profile in laser-dissected islets of Langerhans in the inducible RIP-LCMV-GP mouse model for type 1 diabetes (T1D) RIP-LCMV-GP mice express the glycoprotein (GP) of the lymphocytic choriomeningitis virus (LCMV) in the beta-cells (rat insulin promotor, RIP); T1D develops 10-14 after LCMV-infection
Project description:NK cells may provide a “rheostat” function and have been shown to reduce the magnitude of antigen-specific T cell responses following infection. It remains unknown whether NK cells similarly modulate vaccine-elicited T cell responses following viral challenge. We used the LCMV clone 13 infection model to address whether NK cells regulate T cell responses in Adenovirus vector vaccinated mice following challenge. As expected, NK cell depletion in unvaccinated mice resulted in increased virus-specific CD4+ and CD8+ T cell responses and immunopathology following LCMV challenge. In contrast, NK cell depletion had minimal to no impact on antigen-specific T cell responses in mice that were vaccinated with an Ad5-GP vector prior to LCMV challenge. Moreover, NK cell depletion in vaccinated mice prior to challenge did not result in immunopathology and did not compromise protective efficacy. These data suggest that Adenovirus vaccine-elicited T cells may be less sensitive to NK cell-rheostat regulation than are T cells primed by LCMV infection.
Project description:Investigation of the change of the Trail-dependent NK cell transcriptome during short-term (24h) infection with lymphocytic choriomeningitis virus (LCMV). RNA sequencing-based transcriptomics analysis was performed in spleen-isolated (NK1.1+CD3-) NK cells from 3 naïve Trail+/+ mice, 3 naive Trail-/- mice, 4 LCMV-infected Trail+/+ mice, and 4 LCMV-infected Trail-/- mice.
Project description:Infection with acute and chronic strains of LCMV (Armstrong (ARM) and Clone 13 (C13), respectively) leads to massive proliferation of monocytic cells contemporaneously with peak of the anti-viral CD8+ T cell response. These cells return to naïve levels following ARM infection. However, during C13 infection these cells are sustained at high levels and gain a T cell suppressive function at day 14 post infection. The mechanisms by which these cells are induced to proliferate and impair T cell function during chronic LCMV infection are largely unknown. To address this, we analyzed gene expression profiles using microarray analysis of purified splenic monocytic cells (CD11b+ Ly6Chi Gr-1low) from naïve mice, or day 14 LCMV ARM or LCMV C13 infected mice.
Project description:To identify mechanisms behind immunosuppression during virus infections, we infected mice with LCMV-Armstrong and LCMV-Clone 13 expression patterns. LCMV-Armstrong induces a T-cell reaction that resolves infection within 8-10 days, while LCMV-Clone13 generates a persisten infection through immunosuppression. We used microarray to uncover splenic gene expression patterns specific to each LCMV infection at 5, 9, and 30 days C57BL6 mice, 6-10 weeks old, were infected with LCMV-Armstrong and LCMV-Clone 13 or left uninfected (naïve). At days 5, 9, and 30 whole spleens were harvested for RNA extraction and hybridization on Affymetric microarray.
Project description:The menin tumor suppressor protein (Men1) is deficient in many endocrine tumors and forms an active complex with MLL family histone methyltransferases. This Men1 complex promotes histone H3 lysine 4 trimethylation at target loci including homeobox genes and cyclin-dependent kinase inhibitor genes. The loss of Men1 may be tumorigenic because it leads to decreased histone H3 lysine 4 trimethylation resulting in expressional changes of specific genes. Reversing tumorigenesis induced by a Men1 deficiency might be achieved by inhibition of histone H3 lysine 4 demethylase Rbp2 (Kdm5a). To this end, pancreatic islets from Men1f|f, Rbp2f|f and Men1f|f Rbp2f|f mice were expression profiled to determine what transcriptional changes induced by a Men1 deficiency are reversed by the loss of Rpb2. Pancreatic islets were isolated from Men1flf RIP-Cre mice, Rbp2flf RIP-Cre mice, Men1flf Rbp2flf RIP-Cre mice and two month old matched control mice. Total mRNA was extracted from islets and expression profiled on microarrays.
Project description:Mice were infected with LCMV Cl13 and food intake was measured up to 8dpi. Another group of uninfected mice received the amount of food the infected mice consumed. The third group of naïve mice received food ad libitum.
Project description:We report that the gastrointestinal tract (GIT) is a previously unappreciated long-term reservoir of chronic LCMV-Cl13 infection, and, chronic viral replication in the GIT has a profound effect on the local immune compartment as well as the development of subsequent immune responses. CD45+ immune cells were sorted and analyzed by RNAseq from the small and large intestines of naive mice, or mice infected 30 days prior with LCMV-Arm (acute virus) or LCMV-Cl13 (chronic virus). We show that GIT immune cells from acute and chronically infected mice differ substantially from naive mice; chronically infected mice show increases in genetic pathways involved in T cell activation and killing, inflammasome activation and interferon signaling; chronically infected mice show reduced expression of genes involved in T cell memory and antigen presenting cell activation; and chronic infection induces metabolic changes unique to the small but not large intestinal immune compartment.