Gene expression analysis for pneumonia caused by Gram-positive bacterial infection

Jia,Rufu; Yang,Jingyan; Cui,Ying; Guo,Dongjie; Li,Tiejun

doi:10.3892/etm.2018.5904

Gene expression analysis for pneumonia caused by Gram-positive bacterial infection

Authors:
- Rufu Jia
- Jingyan Yang
- Ying Cui
- Dongjie Guo
- Tiejun Li
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Affiliations: Department of Neuroscience, Cangzhou Central Hospital, Cangzhou, Hebei 061001, P.R. China, Department of Anesthesiology, Cangzhou Central Hospital, Cangzhou, Hebei 061001, P.R. China, Department of Laboratory Medicine, Cangzhou Central Hospital, Cangzhou, Hebei 061001, P.R. China, Teaching Office, Cangzhou Central Hospital, Cangzhou, Hebei 061001, P.R. China
Published online on: February 28, 2018 https://doi.org/10.3892/etm.2018.5904
Pages: 3989-3996

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Abstract

Gram-positive bacteria are an important pathogenic factor for bacterial pneumonia. The aim of the present study was to identify the differentially expressed genes (DEGs) and to explore their associated pathways or expression patterns. Expression profiling of gene arrays from two independent datasets, GSE6269 and GSE35716, were downloaded from the Gene Expression Omnibus. The DEGs between peripheral blood samples from healthy controls and patients with bacterial pneumonia were identified. The Functional Annotation Tool in the Database for Annotation, Visualization and Integrated Discovery was used to annotate and analyze the DEGs in Gene Ontology (GO) terms and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. Multiple proteins were used to generate a protein‑protein interaction (PPI) network. A total of 624 (621 annotated) were identified in the GSE6269 dataset and 398 (295 annotated) DEGs were identified in the GSE35716 dataset between pneumonia and healthy samples. A total of 40 common DEGs were identified between the 2 datasets, including 4 downregulated and 32 upregulated DEGs. In the GO category cellular component, melanosome was highly enriched among 11 genes; in the category biological process, the three most enriched items were regulation of ruffle assembly, negative regulation of calcium ion transport and necroptotic process. In the KEGG terms, only the nuclear factor‑κB signaling pathway (Homo sapiens 04064) was significantly enriched. In the PPI network, five genes (CCL4, TIMP metallopeptidase inhibitor 1, intercellular adhesion molecule 1, plasminogen activator, urokinase receptor and cathepsin B) were identified to have a high degree of interaction with other DEGs. In conclusion, these five genes may represent key genes associated with pneumonia caused by Gram‑positive bacteria. All of these results provide primary information and basic knowledge to understand the mechanisms of the pathogenesis.

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