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A host type I interferon response is induced by cytosolic sensing of the bacterial second messenger cyclic-di-GMP

ABSTRACT: The innate immune system responds to unique molecular signatures that are widely conserved among microbes but that are not normally present in host cells. Compounds that stimulate innate immune pathways may be valuable in the design of novel adjuvants, vaccines, and other immunotherapeutics.The cyclic dinucleotide cyclic-di-guanosine monophosphate (c-di-GMP) is a recently appreciated second messenger that plays critical regulatory roles in many species of bacteria but is not produced by eukaryotic cells. In vivo and in vitro studies have previously suggested that c-di-GMP is a potent immunostimulatory compound recognized by mouse and human cells. Here we provide evidence that c-di-GMP is sensed in the cytosol of mammalian cells via a novel immunosurveillance pathway. The potency of cytosolic signaling induced by cyclic-di- GMP is comparable to that induced by cytosolic delivery of DNA, and both nucleic acids induce a similar transcriptional profile, including triggering of type I interferons and coregulated genes via induction of TBK1, IRF3, NF-!B and MAP kinases. However, the cytosolic pathway that senses c-di-GMP appears to be distinct from all known nucleic acid-sensing pathways.Our results suggest a novel mechanism by which host cells can induce an inflammatory response to a widely produced bacterial ligand.

ORGANISM(S): Mus musculus

PROVIDER: GSE16943 | GEO | 2009/07/22

SECONDARY ACCESSION(S): PRJNA117301

REPOSITORIES: GEO

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A host type I interferon response is induced by cytosolic sensing of the bacterial second messenger cyclic-di-GMP

Project description:The innate immune system responds to unique molecular signatures that are widely conserved among microbes but that are not normally present in host cells. Compounds that stimulate innate immune pathways may be valuable in the design of novel adjuvants, vaccines, and other immunotherapeutics.The cyclic dinucleotide cyclic-di-guanosine monophosphate (c-di-GMP) is a recently appreciated second messenger that plays critical regulatory roles in many species of bacteria but is not produced by eukaryotic cells. In vivo and in vitro studies have previously suggested that c-di-GMP is a potent immunostimulatory compound recognized by mouse and human cells. Here we provide evidence that c-di-GMP is sensed in the cytosol of mammalian cells via a novel immunosurveillance pathway. The potency of cytosolic signaling induced by cyclic-di- GMP is comparable to that induced by cytosolic delivery of DNA, and both nucleic acids induce a similar transcriptional profile, including triggering of type I interferons and coregulated genes via induction of TBK1, IRF3, NF-!B and MAP kinases. However, the cytosolic pathway that senses c-di-GMP appears to be distinct from all known nucleic acid-sensing pathways.Our results suggest a novel mechanism by which host cells can induce an inflammatory response to a widely produced bacterial ligand. Three-condition experiment: macrophages transfected with mono-GMP (negative control), double-stranded DNA (positive control), or cyclic-di-GMP (experimental condition). Biological replicates: two, independently treated, harvested, and hybridized to arrays. One replicate per array, except two technical replicates were performed for one of the positive control samples.

2009-07-21 | E-GEOD-16943 | biostudies-arrayexpress

Bacterial c-di-GMP reorganizes hematopoietic stem/progenitors and niches through STING

Project description:Upon systemic bacterial infection, hematopoietic stem and progenitor cells (HSPCs) migrate to the periphery in order to supply a sufficient number of immune cells. Although pathogen-associated molecular patterns (PAMPs) reportedly mediate HSPC activation, how HSPCs detect pathogen invasion in vivo remains elusive. Bacteria use the second messenger bis-(3’-5’)-cyclic dimeric guanosine monophosphate (c-di-GMP) for a variety of activities. Here we report that c-di-GMP comprehensively regulates both HSPCs and their niche cells through an innate immune sensor, STING, thereby inducing entry into the cell cycle and mobilization of HSPCs, while decreasing the number and repopulation capacity of long-term hematopoietic stem cells (LT-HSCs). Furthermore, we show that type I IFN acts as a downstream target of c-di-GMP to inhibit HSPC expansion in the spleen, while TGF-β1 is required for c-di-GMP-dependent splenic HSPC expansion. Our results define novel machinery underlying dynamic regulation of HSPCs and their niches during bacterial infection through c-di-GMP/STING signaling. Ten-week-old mice were intraperitoneally administered PBS or 200 nmol c-di-GMP, and CD150+ CD41- CD48- CD34- Flt3- LSK cells of pooled bone marrow from 10 mice per group were sorted 3 days later. mRNA was then extracted using RNeasy micro (Qiagen). Likewise, CD45- Ter-119- CD31- CD140a+ CD51+ MSCs and CD45- Ter119- CD31+ endothelial cells from c-di-GMP-treated or untreated mice were sorted and mRNA was extracted. cDNA was synthesized from mRNA and hybridized to gene chip Mouse60k (Agilent Technologies) and expression levels analyzed.

2015-02-13 | E-GEOD-65905 | biostudies-arrayexpress

Bacterial c-di-GMP reorganizes hematopoietic stem/progenitors and niches through STING

2015-02-13 | GSE65905 | GEO

Lsr2, a novel cyclic di-GMP receptor, regulate the synthesis of keto-mycolic acid and control biofilm formation in mycobacteria

Project description:<p>Cyclic di-GMP (c-di-GMP) is a well-known second messenger that plays a key role in many physiological processes in bacteria. The synthesis of lipids is essential for bacterial biofilm formation. However, whether c-di-GMP signaling modulates the synthesis of lipid and further regulates biofilm formation in mycobacteria is unclear, and the c-di-GMP receptor involved remains unknown. In this study, we characterized the nucleoid-associated protein (NAP) Lsr2 as a novel c-di-GMP receptor in mycobacteria. c-di-GMP specifically binds to Lsr2 at a ratio of 1:1. We showed that c-di-GMP promotes mycobacterial biofilm formation in a manner dependent on Lsr2. Furthermore, Lsr2 mediates the synthesis of keto-mycolic acid, the lipid component of the mycobacterial cell wall, by positively regulating the expression of HadD, a (3R)-hydroxyacyl-ACP dehydratase, thus, Lsr2 ultimately controls biofilm formation. Finally, c-di-GMP promotes the positive regulation of HadD by Lsr2 and mycobacterial biofilm formation. Thus, we report a novel c-di-GMP receptor that links the second messenger’s function to lipid synthesis and biofilm formation in mycobacteria.</p>

2023-12-12 | MTBLS7053 | MetaboLights

ChIP-Seq of the Streptomyces venezuelae regulator BldD and its D116A mutant.

Project description:The dimerization and binding of DNA by BldD is affected by its interaction with cyclic di-GMP. The D116A mutant of BldD is partially impaired in its biding of cyclic di-GMP. ChIP-Seq was carried out to determine the difference in the degree of DNA binding by the wild type and D116A mutated BldD in Streptomyces venezuelae.

2017-11-01 | E-MTAB-5328 | biostudies-arrayexpress

B31 vs rrp1 mutant

Project description:Transcriptional profiling of gene expression between parental strain B31 and rrp1 mutant. Cyclic-di-GMP is a bacterial second messenger that modulates many biological processes. Although its role in bacterial pathogenesis during mammalian infection has been widely recognized, the role of c-di-GMP in pathogen's life cycle in vector hosts is less understood. The enzootic cycle of the Lyme disease pathogen Borrelia burgdorferi involves both a mammalian host and an Ixodes tick vector. The B. burgdorferi genome encodes a single copy of the diguanylate cyclase gene (rrp1), which is responsible for the production of c-di-GMP. To determine the role of c-di-GMP in the life cycle of B. burgdorferi, an Rrp1-deficient B. burgdorferi strain was generated. The rrp1 mutant remains infectious in the mammalian host, but could not survive in the tick vector. To identify the mechanisms of Rrp1 contributing to B. burgdorferi pathogenesis and gene regulation, microarray was employed to compare gene expression profiles between the parental strain B31 and the rrp1 mutant. Two-condition experiment, B31 vs. rrp1 mutant. Biological replicates: 3 B31, 3 rrp1 mutant, independently grown and harvested. One replicate (dye-swap) per array.

2013-12-31 | E-GEOD-26968 | biostudies-arrayexpress

Discovery of the genes controlled by the second messenger cyclic di-GMP in Mycobacterium tuberculosis

Project description:Cyclic di-GMP (c-di-GMP) is a ubiquitous second messenger that regulates many biological processes in bacteria. The genome in Mycobacterium tuberculosis encodes a single copy of the diguanylate cyclase gene (dgc) responsible for c-di-GMP synthesis. To determine the role of c-di-GMP signaling in M. tuberculosis, the mutant strain of Δdgc was generated in the virulent H37Rv strain. We used whole genome microarray expression profiling as a discovery platform to identify the genes controlled by c-di-GMP in M. tuberculosis, providing molecular proof for the phenotypes modulated by the signaling.

2013-10-09 | GSE37973 | GEO

Cyclic di-GMP Regulates Shigella flexneri Pathogenesis

Project description:Cyclic di-GMP Regulates Shigella flexneri Pathogenesis

| PRJNA726970 | ENA

B31 vs rrp1 mutant

2013-12-31 | GSE26968 | GEO

Effect of elevated c-di-GMP in Sinorhizobium meliloti

Project description:Sinorhizobium meliloti is a soil-dwelling symbiotic alphaproteobacterium. Cyclic di-GMP is an important second messenger controlling multiple functions in this microorganism. To understand transcriptional regulation by elevated c-di-GMP in S. meliloti, the transcriptome analysis was performed on the wild type strain S. meliloti Rm2011 carrying either an empty vector pWBT or diguanylate cyclase gene pleD overexpression plasmid pWBT-pleD.

2017-06-01 | E-MTAB-5410 | biostudies-arrayexpress

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