2014 Fiscal Year Final Research Report
Target of alternative antimicrobial approach: bacterial pathogenesis regulated by cyclic di-GMP signaling system
| Project/Area Number |
23790925
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | Toho University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-28 – 2015-03-31
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| Keywords | 感染症 / 緑膿菌 / 肺炎 / マウス / Quorum sensing / cyclic di-GMP |
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| Outline of Final Research Achievements |
Macrolides have been reported to exert a variety of effects on both host immunomodulation as well as repression of bacterial pathogenicity. In this study, we report that the 3′,5′-cyclic diguanylic acid (c-di-GMP) signaling system, which regulates virulence to the host, was affected by the macrolide azithromycin (AZM). Using DNA microarray analysis, we selected two Pseudomonas aeruginosa genes related to c-di-GMP metabolism that were significantly affected by AZM treatment. The expression of these genes was significantly repressed by AZM in a time- and dose-dependent manner, whereas no difference in pde gene expression was observed in the absence of AZM. In-frame deletion of the pde gene affected both virulence factors and the quorum-sensing system and significantly decreased total bacteria in a mouse pneumonia model compared to the wild-type strain. These results suggest that macrolides affect virulence factor production via the c-di-GMP regulatory system.
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| Free Research Field |
微生物・感染症学
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