Gene expression data from Mycobacterium tuberculosis-infected WT and miR-155-/- bone-marrow derived macrophages [validation]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE79732 | GEO | 2016/09/14
SECONDARY ACCESSION(S): PRJNA316924
REPOSITORIES: GEO
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Project description:How the complex interaction between Mycobacterium tuberculosis (Mtb) and the host is regulated during infection is still not well understood. Using a systems biology approach, we demonstrate here that miR-155 is one of several microRNAs that regulate host gene expression over the first 48 hours of Mtb infection in macrophages. miR-155 regulates the cell survival of Mtb-infected macrophages through SHIP1/AKT signaling. Using timecourse gene expression data, we constructed a miRNA regulatory network for the innate immune response to Mtb infection by WT macrophages. The network suggested a role for seven miRNAs in regulating the host response to Mtb, with miR-155 being one of them. We then validated a role for miR-155 by comparing the response between WT and miR-155-/- macrophages.
2016-09-14 | GSE79731 | GEO
Project description:Toll-like receptor (TLR)-induced maturation of dendritic cells (DCs) leads to the production of proinflammatory cytokines as well as the upregulation of various molecules involved in T cell activation. These are believed to be the critical events that account for the induction of the adaptive immune response. Here, we have examined the role of micro-RNA-155 (miR-155) in DC function and the induction of immunity. Using a model where the transfer of self-antigen-pulsed, TLR-matured DCs can induce a functional CD8 T cell response and autoimmunity, we find that DCs lacking miR-155 have an impaired ability to break immune tolerance. Importantly, transfer of self- antigen-pulsed DCs overexpressing miR-155 was sufficient to break tolerance in the absence of TLR stimuli. Although these unstimulated DCs induced T cell function in vivo, there was no evidence for the upregulation of costimulatory ligands or cytokine secretion. Further analysis showed that miR-155 influenced the level of the phosphatase SHIP1 in DCs, and that the lack of SHIP1 in DCs was sufficient to break T cell tolerance in vivo, again in the absence of TLR induced DC maturation. Our study demonstrates that the overexpression of miR-155 in DCs is a critical event that is alone sufficient to break self tolerance and promote a CD8-mediated autoimmune response in vivo. This process is independent of the induction of conventional DC maturation markers, indicating that miR-155 regulation of SHIP represents a unique axis that regulates DC function in vivo.
2015-09-04 | GSE72716 | GEO
Project description:The innate inflammatory response must be tightly regulated to ensure effective immune protection while avoiding inflammation-related pathologies. The transcription factor NF-kB is a critical mediator of the inflammatory response, and its dysregulation has been associated with immune related malignancies. We herein show that miR-155, miR-146a and NF-kB form a regulatory network that tunes the macrophage inflammatory response in mice. We show that elevated miR-155 expression potentiates NF-kB activity in miR-146a deficient mice, thus leading to an overactive acute inflammatory response and chronic inflammation. Enforced miR-155 expression overrides miR-146a-mediated repression of NF-kB activation, thus emphasizing that miR-155 plays a dominant, downstream role in promoting inflammation. We further show that miR-155 deficient macrophages exhibit a suboptimal inflammatory response when exposed to low levels of inflammatory stimuli. Importantly, we demonstrate a temporal asymmetry between miR-155 and miR-146a expression during macrophage activation, which forms a combined positive and negative feedback network on NF-kB activity. This miRNA based regulatory network enables a robust and time-limited inflammatory response essential for functional immunity.
2017-07-18 | GSE88791 | GEO
Project description:Several intracellular pathogens target the host miRNA to modulate the expression of host proteins for their successful infection and survival. For example, S. typhimurium (Schulte et al., 2011) and Mycobacterium tuberculosis (Kumar et al., 2015) downregulate miRNAs of let-7 family to modulate immune response in host; H. pylori infection induces the expression of miR-155 to inhibit the release of IL-8 (Xiao et al., 2009); L. monocytogens triggers the expression of anti- inflammatory cytokine IFN-β by downregulation of miR-145 (Izar et al., 2012). Similarly, Leishmania infection also modulates the expression of various miRNA in macrophages (Lemaire et al., 2013). Consequently, it has been shown that L. donovani infection downregulates miR-122 expression which lowers serum cholesterol to facilitate infection (Ghosh et al., 2013). Whereas, Leishmania significantly enhances the miR30A- 3p expression and modulates autophagic pathway in macrophages (Singh et al., 2016). To understand how Leishmania modulate the expression of various genes in infected macrophages, we have compared the miRNA profile of uninfected and infected macrophages.
2017-06-19 | GSE89529 | GEO
Project description:NK cells and pulmonary macrophages both are important components of innate immunity. The interaction between NK cells and pulmonary macrophages during Chlamydia muridarum（C. muridarum）respiratory infections is poorly understood. In this study, we explored the effect of NK cells on regulation of pulmonary macrophage function during chlamydial lung infection. We found that NK depletion led to polarization of pulmonary macrophages from M1 to M2 phenotype, and this related to significantly reduced miR-155 expression in pulmonary macrophage. Using adoptive transfer approach, we found that the recipient mice receiving lung macrophages isolated from C. muridarum-infected NK-cell-depleted mice exhibited an increased bacterial load and severe inflammation in the lung upon chlamydial challenge when compared with the recipients of lung macrophages from infected IgG -treated mice. Herein, the effects of NK cells on macrophage polarization were examined in vitro. We found that NK cells from chlamydial-infected mice (iNK) significantly induced M1 polarization compared to that from sham-infected mice (uNK). Inhibition of miR-155 expression in macrophages attenuated M1 polarization induced by iNK, while miR-155 over-expression enhanced it. Furthermore, neutralization of IFN-γ in the coculture system decreased the expression of miR-155 by macrophages, and resulted in diminished M1 polarization induced by iNK cells. The data indicates that NK cells direct M1 polarization through up-regulation of miR-155 by IFN-γ production, and NK-regulated macrophage polarization is functionally relevant to host defense against chlamydial infection.
2022-01-26 | GSE183577 | GEO
Project description:Toll-like receptor (TLR)-induced maturation of dendritic cells (DCs) leads to the production of proinflammatory cytokines as well as the upregulation of various molecules involved in T cell activation. These are believed to be the critical events that account for the induction of the adaptive immune response. Here, we have examined the role of micro-RNA-155 (miR-155) in DC function and the induction of immunity. Using a model where the transfer of self-antigen-pulsed, TLR-matured DCs can induce a functional CD8 T cell response and autoimmunity, we find that DCs lacking miR-155 have an impaired ability to break immune tolerance. Importantly, transfer of self- antigen-pulsed DCs overexpressing miR-155 was sufficient to break tolerance in the absence of TLR stimuli. Although these unstimulated DCs induced T cell function in vivo, there was no evidence for the upregulation of costimulatory ligands or cytokine secretion. Further analysis showed that miR-155 influenced the level of the phosphatase SHIP1 in DCs, and that the lack of SHIP1 in DCs was sufficient to break T cell tolerance in vivo, again in the absence of TLR induced DC maturation. Our study demonstrates that the overexpression of miR-155 in DCs is a critical event that is alone sufficient to break self tolerance and promote a CD8-mediated autoimmune response in vivo. This process is independent of the induction of conventional DC maturation markers, indicating that miR-155 regulation of SHIP represents a unique axis that regulates DC function in vivo. Dendritic cell culture: Bone marrow was flushed from tibias and femurs of mice with HBSS. Bone marrow cells were cultured at 2x106 cells/ml in 10 ml non-tissue culture treated dishes in RPMI 1640 containing 10% LPS-free FBS, Penicillin:streptomycin glutamine 2-mercaptoethanol (cRPMI), with 40ng/ml murine GM-CSF (Peprotech). On day 3 of cultures 10ml of fresh media was added also containing 40ng/ml GM-CSF. On days 6 and 8, 10ml of media was removed and centrifuged to collect cells, which were resuspended in 10ml fresh media containing GM-CSF and were added back to dishes. Non-adherent cells were isolated on day 9. DCs were plated in 24-well plates at 2x106 cells/ml in 1ml of cRPMI with or without the class B CpG ODN1826 (ACGT DNA Technologies corporation, Toronto, ON, Canada) at 10?M final concentration overnight. Array analysis of mi-RNA expression: BMDCs from WT mice were either stimulated with CpG or left in media alone overnight. Whole RNA was isolated using mirVana miRNA isolation kit following the manufacturers instructions. RNA samples were labeled and hybridized to Agilent mouse miRNA 8x15K arrays (Agilent). Data was generated from 8 individual samples (4 unstimulated and 4 CpG-treated).
2015-09-04 | E-GEOD-72716 | biostudies-arrayexpress
Project description:Classically activated (M1) macrophages protect from infection but can cause inflammatory disease and tissue damage while alternatively activated (M2) macrophages reduce inflammation and promote tissue repair. Modulation of macrophage phenotype may be therapeutically beneficial and requires further understanding of the molecular programs that control macrophage differentiation. A potential mechanism by which macrophages differentiate may be through microRNA (miRNA), which bind to messenger RNA and post-transcriptionally modify gene expression, cell phenotype and function. The inflammation-associated miRNA, miR-155, was rapidly up-regulated over 100-fold in M1, but not M2, macrophages. Inflammatory M1 genes and proteins iNOS, IL-1b and TNF-a were reduced up to 72% in miR-155 knockout mouse macrophages, but miR-155 deficiency did not affect expression of genes associated with M2 macrophages (e.g., Arginase-1). Additionally, a miR-155 oligonucleotide inhibitor efficiently suppressed iNOS and TNF-a gene expression in wild-type M1 macrophages. Comparative transcriptional profiling of unactivated (M0) and M1 macrophages derived from wild-type and miR-155 knockout (KO) mice revealed an M1 signature of approximately 1300 genes, half of which were dependent on miR-155. Real-Time PCR of independent datasets validated miR-155's contribution to induction of iNOS, IL-1b, TNF-a, IL-6 and IL-12, as well as suppression of miR-155 targets Inpp5d, Tspan14, Ptprj and Mafb. Overall, these data indicate that miR-155 plays an essential role in driving the differentiation and effector potential of inflammatory M1 macrophages. Total RNA was prepared from bone marrow-derived macrophages of miR-155 knockout mice (n=2 independent mice) treated in M0, M1 or M2 conditions (n=2 replicates per condition originating from different mice)
2016-07-15 | E-GEOD-77425 | biostudies-arrayexpress
Project description:Analysis of Mtb infected murine macrophages derived from C57Bl/6 WT, TPL2KO, IFNARKO & TPL2IFNAR DKO mice [Set 2] Tuberculosis, caused by Mycobacterium tuberculosis (Mtb), remains a leading cause of mortality and morbidity worldwide, causing approximately 1.4 million deaths per year. Key immune components for host protection during tuberculosis include the cytokines IL‐12, IL‐1 and TNF‐α, as well as IFN‐γ and CD4+ Th1 cells. However, immune factors determining whether individuals control infection or progress to active tuberculosis are incompletely understood. Excess amounts of type I interferon have been linked to exacerbated disease during tuberculosis in mouse models and to active disease in patients, suggesting tight regulation of this family of cytokines is critical to host resistance. In addition, the immunosuppressive cytokine IL‐10 is known to inhibit the immune response to Mtb in murine models through the negative regulation of key pro-inflammatory cytokines and the subsequent Th1 response. We show here, using a combination of transcriptomic analysis, genetics and pharmacological inhibitors that the TPL-2-ERK1/2 signaling pathway is important in mediating host resistance to tuberculosis through negative regulation of type I interferon production. The TPL-2-ERK1/2 signalling pathway regulated production by macrophages of several cytokines important in the immune response to Mtb as well as regulating induction of a large number of additional genes, many in a type I IFN dependent manner. In the absence of TPL-2 in vivo, excess type I interferon promoted IL-10 production and exacerbated disease. These findings describe an important regulatory mechanism for controlling tuberculosis and reveal mechanisms by which type I interferon may promote susceptibility to this important disease. Macrophages were derived from C57Bl/6 WT, TPL2KO, IFNARKO & TPL2IFNARKO bone marrow, plated and infected with Mtb H37Rv (or not) in triplicate wells. The indicated samples were also treated with 5ng/ml IFNgamma at the time of infection. Samples were then harvested for RNA at time 0, 1hr and 6hr. Please note that *Sample and *Medium control samples (e.g. '0hr TPL2-/-IFNabR-/- Sample' vs '0hr TPL2-/-IFNabR-/- Medium Control Sample') are the same sample group (i.e. uninfected) with one group being a repeat re-run of the other (indicated in the correponding SAMPLE description field).
2013-09-05 | E-GEOD-47673 | biostudies-arrayexpress
Project description:Analysis of Mtb infected murine macrophages derived from C57Bl/6 WT, TPL2KO, IFNARKO & TPL2IFNAR DKO mice [Set 1] Tuberculosis, caused by Mycobacterium tuberculosis (Mtb), remains a leading cause of mortality and morbidity worldwide, causing approximately 1.4 million deaths per year. Key immune components for host protection during tuberculosis include the cytokines IL?12, IL?1 and TNF??, as well as IFN?? and CD4+ Th1 cells. However, immune factors determining whether individuals control infection or progress to active tuberculosis are incompletely understood. Excess amounts of type I interferon have been linked to exacerbated disease during tuberculosis in mouse models and to active disease in patients, suggesting tight regulation of this family of cytokines is critical to host resistance. In addition, the immunosuppressive cytokine IL?10 is known to inhibit the immune response to Mtb in murine models through the negative regulation of key pro-inflammatory cytokines and the subsequent Th1 response. We show here, using a combination of transcriptomic analysis, genetics and pharmacological inhibitors that the TPL-2-ERK1/2 signaling pathway is important in mediating host resistance to tuberculosis through negative regulation of type I interferon production. The TPL-2-ERK1/2 signalling pathway regulated production by macrophages of several cytokines important in the immune response to Mtb as well as regulating induction of a large number of additional genes, many in a type I IFN dependent manner. In the absence of TPL-2 in vivo, excess type I interferon promoted IL-10 production and exacerbated disease. These findings describe an important regulatory mechanism for controlling tuberculosis and reveal mechanisms by which type I interferon may promote susceptibility to this important disease. Macrophages were derived from C57Bl/6 bone marrow, plated and infected with Mtb H37Rv (or not) in duplicate wells. Samples were then harvested for RNA at time 0 (uninfected only), 15m, 30m, 1hr, 3hr, 6hr and 24hr.
2013-09-05 | E-GEOD-47672 | biostudies-arrayexpress
Project description:Classically activated (M1) macrophages protect from infection but can cause inflammatory disease and tissue damage while alternatively activated (M2) macrophages reduce inflammation and promote tissue repair. Modulation of macrophage phenotype may be therapeutically beneficial and requires further understanding of the molecular programs that control macrophage differentiation. A potential mechanism by which macrophages differentiate may be through microRNA (miRNA), which bind to messenger RNA and post-transcriptionally modify gene expression, cell phenotype and function. The inflammation-associated miRNA, miR-155, was rapidly up-regulated over 100-fold in M1, but not M2, macrophages. Inflammatory M1 genes and proteins iNOS, IL-1b and TNF-a were reduced up to 72% in miR-155 knockout mouse macrophages, but miR-155 deficiency did not affect expression of genes associated with M2 macrophages (e.g., Arginase-1). Additionally, a miR-155 oligonucleotide inhibitor efficiently suppressed iNOS and TNF-a gene expression in wild-type M1 macrophages. Comparative transcriptional profiling of unactivated (M0) and M1 macrophages derived from wild-type and miR-155 knockout (KO) mice revealed an M1 signature of approximately 1300 genes, half of which were dependent on miR-155. Real-Time PCR of independent datasets validated miR-155's contribution to induction of iNOS, IL-1b, TNF-a, IL-6 and IL-12, as well as suppression of miR-155 targets Inpp5d, Tspan14, Ptprj and Mafb. Overall, these data indicate that miR-155 plays an essential role in driving the differentiation and effector potential of inflammatory M1 macrophages.
2016-07-15 | GSE77425 | GEO