Unknown,Transcriptomics,Genomics,Proteomics

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Expression Data from Brucella abortus strain 2308 and isogenic vtlR mutant cells

ABSTRACT: VtlR (virulence-associated transcriptional LysR-family regulator) is thought to be a transcriptional regulator of B. abortus virulence determinants We used custom-made Affymetrix B. abortus strain 2308 derived GeneChips to compare the gene expression properties of wild type and isogenic vtlR mutant cells. B. abortus strain 2308 or vltR mutant cells were grown to late exponential phase growth, total bacterial RNA was isolated and subjected to GeneChip hybridization and analysis. We sought to determine the regulatory effects of VtlR.

ORGANISM(S): Brucella abortus

SUBMITTER: Paul Dunman

PROVIDER: E-GEOD-69564 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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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 Total RNA used for microarray analysis was obtained from 6 placentas with 12 infected and 12 control explants from each placenta. At 4 h after inoculation, total RNA was isolated from the trophoblastic surface of the explants. Three RNA pools from two placentas each were generated prior to cDNA synthesis.

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Expression Data from Brucella abortus strain 2308 and isogenic vtlR mutant cells

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