Immunization with 3-oxododecanoyl-L-homoserine lactone-r-PcrV conjugate enhances survival of mice against lethal burn infections caused by Pseudomonas aeruginosa

  • Isar Dejban Golpasha Department of Biology, Science and Research branch, Islamic Azad University, Tehran, Iran
  • Seyed Fazlollah Mousavi Microbiology Research Center and Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran
  • Parviz Owlia Molecular Microbiology Research Center, Shahed University, Tehran, Iran
  • Seyed Davar Siadat Microbiology Research Center and Department of Microbiology, Pasteur Institute of Iran, Tehran, Iran
  • Shiva Irani Department of Biology, Science and Research branch, Islamic Azad University, Tehran, Iran
Keywords: 3-oxo-C12-HSL, Homoserine lactone (HSL), Immunization, PcrV, Pseudomonas aeruginosa, Vaccine

Abstract

Quorum Sensing and type III secretion system play an important role in the virulence of Pseudomonas (P.) aeruginosa in burn wound infections. We aimed to explore the feasibility of using 3-oxo-C12-HSL-r-PcrV conjugate as a candidate vaccine against P. aeruginosa caused infections. 3-oxo-C12-HSL-r-PcrV conjugate was prepared and used for immunization of mice (10 μg, subcutaneous, three times, at 2-week intervals). Mice were divided into five groups: I: PcrV; II: 3-oxo-C12-HSL-r-PcrV (10 μg); III: 3-oxo-C12-HSL-r-PcrV (20 μg); IV: 3-oxo-C12-HSL; and V: PBS receiving groups.  After each shot of immunization, total and isotype antibody responses against corresponding antigen were measured to determine the immunization efficacy. One month after the last immunization, all groups were burned and challenged subeschar with P. aeruginosa PAO1. Survival rate and bacterial quantity in the skin and internal organs (liver and spleen) were evaluated 25-hr after burn infection. Immunization with 3-oxo-C12-HSL-r-PcrV significantly increased total IgG and specific subclass antibodies (IgG1, IgG2a, IgG2b, and IgM) in the serum of the groups II and III compared to the control group (p<0.001). While all the control mice (PBS injected group) died within 2 days after bacterial challenge, 64% of the group I, 78% of group II, and 86% of group III, survived within 14 days after challenge. Interestingly, bacterial burden in the liver and spleen of 3-oxo-C12-HSL-r-PcrV injected group (III) was significantly lower than the control group (p<0.001).  The present study proposed two-component vaccine to inhibit Pseudomonas infections in burned mouse. 

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Author Biography

Isar Dejban Golpasha, Department of Biology, Science and Research branch, Islamic Azad University, Tehran, Iran
Department of Biology, Science and Research branch, Islamic Azad University, Tehran, Iran

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Published
2015-05-25
How to Cite
1.
Golpasha ID, Mousavi SF, Owlia P, Siadat SD, Irani S. Immunization with 3-oxododecanoyl-L-homoserine lactone-r-PcrV conjugate enhances survival of mice against lethal burn infections caused by Pseudomonas aeruginosa. Bosn J of Basic Med Sci [Internet]. 2015May25 [cited 2019Nov.21];15(2):15-4. Available from: https://bjbms.org/ojs/index.php/bjbms/article/view/292
Section
Immunology