title: Immunogenicity comparison of conjugate vaccines composed of alginate and lipopolysaccharide of Pseudomonas aeruginosa bound to diphtheria toxoid.
abstract: OBJECTIVE
  Treatment of Pseudomonas aeruginosa infections is greatly hampered by innate and acquired antibiotic resistance. The goal of this study was to compure the immunogenicity of conjugates of P. aeruginosa depolymerized alginate-diphtheria toxoid (D-ALGDT) and P. aeruginosa detoxified lipopolysaccharidediphtheria toxoid (D-LPSDT) in mouse model.
  
  
  METHODS
  Alginate and LPS were purified from P. aeruginosa strain PAO1. The resulting depolymerized alginate (D-ALG) and detoxified LPS (D-LPS) were covalently coupled to diphtheria toxoid (DT) as a carrier protein with adipic acid dihydrazide (ADH) as a spacer molecule and carbodiimide as a linker. Sterility, safety and pyrogenicity tests were performed. 30 mice in two groups were immunized intraperitoneally on days 0, 14 and 28 with 10 μg of D-ALGDT and D-LPSDT. Conjugates specific antibody levels were also determined by enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  The conjugates were non-toxic and non-pyrogenic. Conjugates of D-ALGDT and D-LPSDT were shown to be safe and to elicit total IgG, IgM, IgA, IgG1, IgG2a, IgG2b and IgG3 antibodies in mice. ELISA results indicated that antibodies titer of D-ALGDT was more than D-LPSDT.
  
  
  CONCLUSIONS
  Immunization with D-ALGDT showed significant increase in all types of antibodies titers in versus D-LPSDT, suggesting D-ALGDT as a vaccine candidate against P. aeruginosa infections.
authors.affiliation: Department of Microbiology, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
authors.forename: Faezeh
authors.initials: F
authors.lastname: Najafzadeh
authors.affiliation: Department of Microbiology, Science and Research Branch, Islamic Azad University, Kerman, Iran.
authors.forename: Ghazaleh
authors.initials: G
authors.lastname: Jaberi
authors.affiliation: Biologic Research Center, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Shapouri
authors.affiliation: Biologic Research Center, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Rahnema
authors.affiliation: Department of Microbiology, Science and Research Branch, Islamic Azad University, Kerman, Iran.
authors.forename: Ashraf
authors.initials: A
authors.lastname: Karimi-Nik
authors.affiliation: Medical Biotechnology Department, School of Advanced Medical Sciences, Tabriz University Of Medical Sciences, Tabriz, Iran.
authors.forename: Anvarsadat
authors.initials: A
authors.lastname: Kianmehr
keywords: Pseudomonas aeruginosa; alginate (ALG); conjugate vaccine; diphtheria toxoid (DT); lipopolysaccharide (LPS)
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