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Protein ISGylation regulated gene expression in mouse mammary epithelial cells

ABSTRACT: Purpose: The goals of this study are to use RNA-seq to identify genes whose expression are regulated by protein ISGylation in a genome-wide scale Methods: mRNA profiles of PyVmT/Uba7 KO + Control and PyVmT/Uba7 KO+UBE1L mammary epithelial cells (MECs) were generated by deep-sequecing in duplicates, using Illumina HiSeq4000. Results: Using an optimized data analysis workflow, we mapped about 25 million sequence reads per sample to the mouse genome (M16 genome annotation). 259 genes are identified as differentially expressed transcripts from RNA-seq analysis of PyVmT/Uba7 KO + empty vector vs PyVmT/Uba7 KO + UBE1L MECs treated by LPS (100ng/mL) for 6 hours after IFN (1000 U/mL) priming for 24 hours. Conclusions: protein ISGylation facilitated expression of a group genes, which are regulated by STAT1/STAT2 containing complexes.

ORGANISM(S): Mus musculus

PROVIDER: GSE112532 | GEO | 2020/03/27

REPOSITORIES: GEO

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Project description:Filamentous hemagglutinin (FHA), Bordetella pertussis' key adhesin, is both present at the cell surface and released in the extracellular milieu. To comprehend the role free FHA plays in the pathogenic process, we analyzed the global transcriptional changes in human peripheral blood mononuclear cells (PBMC) after exposure to that purified virulence factor. This analysis was undertaken with four different FHA preparations (FHA-1, FHA-2, FHA-3, and FHA-4), purified from four different B. pertussis strains. Cultures comprising 3x106 PBMC were stimulated for 0.5, 2, 4, and 6 hours with 5 ug/ml of each purified B. pertussis FHA. Control PBMC cultures were simultaneously treated with similar volumes of elution buffers (Mock-1 and Mock-2), and sampled at the same time points. The array experiment was composed of 27 samples. Most of the transcripts known to be part of the "common host-transcriptional response" that mediates inflammation were among the 1,235 array elements (representing 683 known unique genes) showing a greater than 3-fold change in transcript abundance between FHA-treated and untreated cells. We also identified an FHA-specific signature not observed in cells stimulated with B. pertussis LPS or heat-killed B. pertussis. This response, mounted by 13 genes, largely (69%, 9/13 genes) interferon (IFN)-regulated genes. Further analysis revealed that 18.3% (125 out of 683) of the FHA-responsive genes were in fact regulated by IFN. These included several major players of the antiviral IFN type I response, as well as three key components of the ISGylation pathway. Induction of the ubiquitin-like protein ISG15 and its specific protease USP18 was confirmed at the mRNA level by relative real-time polymerase chain reaction (RT-PCR). Western-blot analysis demonstrated the presence of both free ISG15 and several ISGylated conjugates in FHA-stimulated PBMC cell lysate. Intracellular FACS analysis provided further evidence that monocytes and a natural-killer (NK)-enriched cell population are the primary producers of ISG15 after FHA stimulation. Our results revealed new activities of free B. pertussis FHA: activation of the host IFN and ISGylation pathways. The consequences of such activation are yet to be resolved, but we hypothesize that FHA utilizes the ISGylation pathway or USP18 to regulate the IFN response, which in turn sensitizes the host to the infection and induces cell death. Groups of assays that are related as part of a time series. Infection: treatment with purified B. pertussis filamentous hemagglutinin (FHA) at 0.005 mg/mL Time: Samples were collected after various treatment time (hours) Keywords: time_series_design Computed

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Protein ISGylation regulated gene expression in mouse mammary epithelial cells

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