- A Potent Brucella abortus 2308 Δery Live Vaccine Allows for the Differentiation between Natural and Vaccinated Infection
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Junbo Zhang , Shuanghong Yin , Fei Guo , Ren Meng , Chuangfu Chen , Hui Zhang , Zhiqiang Li , Qiang Fu , Huijun Shi , Shengwei Hu , Wei Ni , Tiansen Li , Ke Zhang
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J. Microbiol. 2014;52(8):681-688. Published online July 4, 2014
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DOI: https://doi.org/10.1007/s12275-014-3689-9
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Brucellosis is a globally distributed zoonotic disease that causes animal and human diseases. However, the current Brucella abortus vaccines (S19 and RB51) are deficient; they can cause abortion in pregnant animals. Moreover, when the
vaccine S19 is used, tests cannot differentiate natural from vaccinated infection. Therefore, a safer and more potent vaccine is needed. A Brucella abortus 2308 ery promoter mutant (Δery) was constructed to overcome these drawbacks. The growth of the Δery mutant was significantly attenuated in macrophages and mice and induced high protective immunity in mice. Moreover, Δery induced an anti-Brucellaspecific IgG (immunoglobulin G) response and stimulated the expression of interferon-gamma (INF-γ) and interleukin-4 (IL-4). Furthermore, the expression of EryA antigen allowed for the serological differentiation between natural and vaccinated infection in mice. These results indicate that the Δery mutant is a potential attenuated live vaccine candidate against virulent Brucella abortus 2308 (S2308) infection.
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Citations
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- Involvement of Phosphatidylinositol 3-Kinase/Akt Signaling Pathway in β1 Integrin-Mediated Internalization of Staphylococcus aureus by Alveolar Epithelial Cells
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Jia-He Wang , Ke Zhang , Nan Wang , Xiao-Min Qiu , Yi-Bing Wang , Ping He
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J. Microbiol. 2013;51(5):644-650. Published online June 25, 2013
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DOI: https://doi.org/10.1007/s12275-013-3040-x
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The invasion of Staphylococcus aureus into alveolar epithelial cells is regarded as the key step for S. aureus lung infection. However, the mechanism of internalization of S. aureus by alveolar epithelial cells is not clear, and was the aim of this investigation Human lung adenocarcinomic epithelial cells and A549 cells were used. Human β1 integrin and rat β1 integrin were detected by real-time reverse transcription (RT)-PCR. The expressions of β1 integrin, Akt and p-Akt were detected by Western blot analysis. To further investigate the role of β1 integrin in S. aureus internalization by alveolar epithelial cells, we next performed siRNA-mediated knockdown of β1 integrin expression. In this study, we found that S. aureus invades human alveolar epithelial cells and rat primary alveolar epithelial cells. The β1 integrin ligand competitive inhibitor, GRGDS-peptide, blocked the internalization of S. aureus by A549 cells. Knockdown of β1 integrin also inhibited the internalization of S. aureus. In addition, the PI3K/Akt signaling pathway in alveolar epithelial cells was activated by the infection with S. aureus. Furthermore, Akt phosphorylation was abolished by transient transfection with β1 integrin siRNA in A549 cells challenged with S. aureus. Our results suggest that the phosphatidylinositol 3-kinase/Akt signaling pathway plays an important role in β1 integrin-mediated internalization of S. aureus by alveolar epithelial cells.
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