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Microarray analysis to identify differentially expressed genes of intracellular Brucella abortus in RAW264.7 cells

ABSTRACT: Microarray analysis determined that 7.82% (244/3334) of Brucella abortus genes were up-regulated and 5.4% (180/3334) were down-regulated in RAW264.7 macrophages, compared to free-living bacteria in TSB

ORGANISM(S): Brucella abortus bv. 1 str. 9-941 Brucella abortus str. 2308 A

PROVIDER: GSE46459 | GEO | 2013/04/30

SECONDARY ACCESSION(S): PRJNA200551

REPOSITORIES: GEO

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Microarray analysis to identify differentially expressed genes of intracellular Brucella abortus in RAW264.7 cells

Project description:Microarray analysis determined that 7.82% (244/3334) of Brucella abortus genes were up-regulated and 5.4% (180/3334) were down-regulated in RAW264.7 macrophages, compared to free-living bacteria in TSB In the study, Brucela abortus was isolated from infected macrophages at 24 post-infection, DNA microarray was used to analysis the differentially expressed genes between intracellular bacteria and free-living ones in TSB

2013-04-30 | E-GEOD-46459 | biostudies-arrayexpress

Microarray Analysis of mRNA Levels from RAW264.7 Macrophages Infected with Brucella abortus

Project description:Identification of host responses at the gene transcription level provides a molecular profile of the events that occur following infection. Brucella abortus is a facultative intracellular pathogen of macrophages that induces chronic infection in humans and domestic animals. Using microarray technology, the response of macrophages 4 hours following B. abortus infection was analyzed to identify early intracellular infection events that occur in macrophages. Of the more than 6,000 genes, we identified over 140 genes that were reproducibly differentially transcribed. First, an increase in the transcription of a number of pro-inflammatory cytokines and chemokines, such as TNF-α, IL-1β, IL-1α, and members of the SCY family of proteins, was evident that may constitute a general host recruitment of antibacterial defenses. Alternatively, Brucella may subvert newly arriving macrophages for additional intracellular infection. Second, transcription of receptors and cytokines associated with antigen presentation, e.g., MHC class II and IL-12p40, were not evident at this 4 hour period of infection. Third, Brucella inhibited transcription of various host genes involved in apoptosis, cell cycling, and intracellular vesicular trafficking. Identification of macrophage genes whose transcription was inhibited suggests that Brucella utilizes specific mechanisms to target certain cell pathways. In conclusion, these data suggest that B. abortus can alter macrophage pathways to recruit additional macrophages for future infection while simultaneously inhibiting apoptosis and innate immune mechanisms within the macrophage permitting intracellular survival of the bacterium. These results provide insights into the pathogenic strategies used by Brucella to survive long-term within a hostile environment. Keywords: Macrophage, intracellular pathogen, Brucella abortus, inflammatory immune response

2010-01-01 | GSE8384 | GEO

Gene expression profiling of Brucella abortus-infected mouse macrophages

Project description:Gene expression analysis of wild-type and STING knock-out mouse bone marrow-derived macrophages (mBMDM) infected with Brucella abortus or transfected with Brucella abortus DNA. Genes whose expression are affected by Brucella abortus in a STING-dependent manner will be identified and signaling pathways regulated by STING will be elucidated.

2017-11-06 | GSE96071 | GEO

GcrA binding pattern to Brucella abortus genome

Project description:ChIP-seq analysis of GcrA atypical transcription factor in Brucella abortus

2019-09-03 | GSE136733 | GEO

RNA-seq based transcriptinal profiling of intracellular Brucella abortus and Brucella abortus-infected murine macrophages

Project description:We describe the isolation of sufficient Brucella abortus RNA from primary host cell environment using modified reported methods for RNA-seq analysis, and simultaneously characterize the transcriptional profiles of intracellular B. abortus and bone marrow-derived macrophages (BMM) from BALB/c mice at 24 h (replicative phase) post-infection.

2017-07-08 | GSE100914 | GEO

Brucella abortus ChipSeq analysis of BvrR

Project description:Brucella abortus ChipSeq analysis of BvrR

2020-11-10 | E-MTAB-9740 | biostudies-arrayexpress

RNase and sRNA activity in Brucella abortus

Project description:Isogenic deletion and truncation of specific genes encoding RNases in Brucella abortus were analyzed for changes in gene expression. The main goal of this work is to determine the mRNAs that exhibit dysregulation when small regulatory RNAs (i.e., Bsr8) or RNases (i.e., RNaseE and RNaseJ) are invactivated in Brucella abortus. Small regulatory RNAs often control gene expression by binding directly to mRNAs to block translation or induce their degradation, and RNA from a deletion of one sRNA gene, bsr8, was analyzed to uncover the mRNAs that may be controlled by BsrB. RNases are enzymes that cleave RNAs during processing, turnover, and regulatory events, and RNaseE and RNaseJ appear to be important for B. abortus virulence. Therefore, to determine the mRNAs potentially targetd by these RNases, RNA from a strain harboring a RNaseE truncation and a strain carrying a deletion of rnaseJ were analyzed. In the end, the objective of this study was to gain insight into the regulatory patterns of specific B. abortus sRNAs and RNases.

2020-07-24 | GSE155009 | GEO

Label-free quantitative proteomic analysis of Brucella abortus and Brucella melitensis

Project description:Brucella type strains (B. abortus 544 and B. melitensis 16 M), field-isolates (B. abortus T and B. melitensis C) were independently cultivated six times on Tryptic Soy Broth at 37 °C in the presence of 5% CO2 until mid-logarithmic phase. The cells were harvested by brief centrifugation and the bacteria was inactivated using recommended ethanol precipitation procedure. Following which the cells were lysed, proteins quantified and the differentially expressed proteins among B. abortus and B. melitensis were identified using liquid chromatography-mass spectrometry (LC/MS) based label free quantitative proteomics analysis.

2020-06-11 | PXD006348 | Pride

ClpP protease modulates bacterial growth, stress response and bacterial virulence in Brucella abortus

Project description:Intracellular proteolysis via ATP-dependent proteases is a conserved biological process. The ATP-dependent Clp protease is made up of peptidase ClpP and ATP-dependent chaperones and plays an important role in the proteolysis process. In several pathogenic bacteria, the Clp protease is implicated in the stress reponses and contributes to the bacterial virulence. In brucella abortus, the ΔclpP mutant strain exhibited a pronounced growth defect in TSB medium and the results showed that the ΔclpP mutant was sensitive to high temperature, high osmotic environment and iron deficient environment. In addition, deletion of the clpP significantly affected Brucella virulence in macrophage and mice infection models. Based on the iTRAQ analysis, the different expressed proteins were mainly involved in amino acid transport and metabolism, energy production and conversion, and secondary metabolites biosynthesis, transport and catabolism. Overall, our study revealed preliminary molecular mechanism between Clp protease, bacterial growth, stress response and bacterial virulence in Brucella strains

2023-10-24 | PXD034842 | Pride

Bovine trophoblasts: control vs. infected with Brucella abortus

Project description:Brucellosis is still a widespread zoonotic disease. Very little is known about the interaction between B. abortus and trophoblastic cells, which is essential for better understanding the pathogenesis of the Brucella-induced placentitis and abortion, a key event for transmission of the disease. The goal of this study was to evaluate the profile of gene expression by bovine trophoblastic cells during infection with B abortus. Explants of chorioallantoic membranes were inoculated with B. abortus strain 2308. Microarray analysis was performed at 4 h after infection, and expression of cytokines and chemokines by trophoblastic cells was assessed by real time RT-PCR at 6 and 12 h after inoculation. In addition, cytokine and chemokine expression was evaluated in placentomes from experimentally infected cows. Expression of pro-inflammatory genes by trophoblastic cells was suppressed at 4 h after inoculation, whereas a significant up-regulation of CXC chemokines, namely CXCL6 (GCP-2) and CXCL8 (IL-8), was observed at 12, but not at 6 h after inoculation. Placentomes of experimentally infected cows had a similar profile of chemokine expression, with upregulation of CXCL6 and CXCL8. Our data indicate that B. abortus modulates the innate immune response by trophoblastic cells, suppressing expression of pro-inflammatory mediators during the early stages of infection that is followed by a delayed and mild expression of pro-inflammatory chemokines, which is similar to the profile of chemokine expression in the placentomes of experimentally infected cows. This trophoblastic response is likely to contribute to the pathogenesis of B. abortus-induced placentitis. Keywords: trophoblast response to Brucella

2008-03-01 | GSE10342 | GEO

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