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Protective efficacy of a Mycoplasma pneumoniae P1C DNA vaccine fused with the B subunit of Escherichia coli heat-labile enterotoxin

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In the present study, we investigated the immunomodulatory responses of a DNA vaccine constructed by fusing Mycoplasma pneumoniae P1 protein carboxy terminal region (P1C) with the Escherichia coli heat-labile toxin B subunit (LTB). BALB/c mice were immunized by intranasal inoculation with control DNAs, the P1C DNA vaccine or the LTB–P1C fusion DNA vaccine. Levels of the anti-M. pneumoniae antibodies and levels of interferon-γ and IL-4 in mice were increased significantly upon inoculation of the LTB–P1C fusion DNA vaccine when compared with the inoculation with P1C DNA vaccine. The LTB–P1C fusion DNA vaccine efficiently enhanced the M. pneumoniae-specific IgA and IgG levels. The IgG2a/IgG1 ratio was significantly higher in bronchoalveolar lavages fluid and sera from mice fusion with LTB and P1C than mice receiving P1C alone. When the mice were challenged intranasally with 107 CFU M. pneumoniae strain (M129), the LTB–P1C fusion DNA vaccine conferred significantly better protection than P1C DNA vaccine (P < 0.05), as suggested by the results, such as less inflammation, lower histopathological score values, lower detectable number of M. pneumoniae strain, and lower mortality of challenging from 5 × 108 CFU M. pneumoniae. These results indicated that the LTB–P1C fusion DNA vaccine efficiently improved protective efficacy against M. pneumoniae infection and effectively attenuated development of M. pneumoniae in mice.

Keywords: DNA vaccine; Mycoplasma pneumoniae; P1 adhesin protein carboxy terminal region; région carboxyterminale de l’adhésine P1; sous-unité B de l’entérotoxine thermolabile d’Escherichia coli; the B subunit of Escherichia coliheat-labile enterotoxin; vaccin à ADN

Document Type: Research Article


Affiliations: 1: Department of Microbiology and Immunology, Pathogenic Biology Institute, University of South China, Hengyang 421001, China. 2: Xiangya School of Medicine, Central South University, Changsha 410078, China.

Publication date: 2012-06-09

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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