title: Development of safer pertussis DNA vaccine expressing non-toxic C180 polypeptide of pertussis toxin S1 subunit.
abstract: A toxic N-terminal 180-amino-acid fragment (C180) of pertussis toxin S1 subunit has the most potent ability to induce protective immunity against pertussis toxin (PT) following DNA-based immunization [Kamachi K, Arakawa Y. Infect Immun 2004;72:4293-6]. For the development of a safer pertussis DNA vaccine, three plasmids encoding mutant C180 (C180-R9K, C180-E129G and C180-R9K/E129G) were constructed and tested for their protective immunogenicity and cytotoxicity. All of the gene gun delivery of the plasmid, performed by inserting the mutant C180 gene into a mammalian expression vector pcDNA3.1, successfully induced anti-PT IgG antibody production without the loss of immunogenicity in mice. The immunizations of mice with the plasmids significantly inhibited leukocytosis-promoting activity by PT. Among stably transfected Chinese hamster ovary (CHO) cells expressing mutant C180, the expression of C180-R9K and C180-R9K/E129G was non-toxic to the transfectants, confirming that these mutant C180s have no cytotoxicity to mammalian cells. These results indicate that C180-R9K and C180-R9K/E129G genes, especially C180-R9K/E129G, are candidates for safe and effective antigen DNAs in the development of pertussis DNA vaccine.
authors.affiliation: Department of Bacterial Pathogenesis and Infection Control, National Institute of Infectious Diseases, Gakuen 4-7-1, Musashimurayama, Tokyo 208-0011, Japan. kamachi@nih.go.jp
authors.forename: Kazunari
authors.initials: K
authors.lastname: Kamachi
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Arakawa
mesh_terms: D000818:Animals; D001886:Bordetella pertussis / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D016466:CHO Cells; D019556:COS Cells; D002522:Chlorocebus aethiops; D006224:Cricetinae; D003412:Cricetulus; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D037342:Pertussis Toxin / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D010567:Pertussis Vaccine / Q000008:administration & dosage / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D010957:Plasmids / Q000235:genetics / Q000276:immunology; D014162:Transfection; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D014917:Whooping Cough / Q000276:immunology / Q000517:prevention & control*
chemical_list: D010567:Pertussis Vaccine; D019444:Vaccines, DNA; C083388:pertussis toxin, S1 subunit; D037342:Pertussis Toxin