A killed, genetically engineered derivative of a wild-type extraintestinal pathogenic E. coli strain is a vaccine candidate
| Autor: | Thomas A. Russo, Ruth Olson, Brian D. Johnston, Janet M. Beanan, Stacy A. Genagon, Bruce A. Davidson, James R. Johnson, Ulrike MacDonald, John J. Cope |
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| Rok vydání: | 2007 |
| Předmět: |
Male
Bacterial capsule Immunogen Escherichia coli Vaccines Heterologous Biology Article Microbiology Mice Immune system Antigen Formaldehyde Escherichia coli Animals Humans Administration Intranasal Bacterial Capsules Escherichia coli Infections General Veterinary General Immunology and Microbiology Escherichia coli Proteins Public Health Environmental and Occupational Health O Antigens Antibodies Bacterial Virology Blood Infectious Diseases Vaccines Inactivated Immunization biology.protein Molecular Medicine Female Rabbits Antibody Genetic Engineering |
| Zdroj: | Vaccine. 25:3859-3870 |
| ISSN: | 0264-410X |
| DOI: | 10.1016/j.vaccine.2007.01.100 |
| Popis: | Infections due to extraintestinal pathogenic E. coli (ExPEC) result in significant morbidity, mortality and increased healthcare costs. An efficacious vaccine against ExPEC would be desirable. In this report, we explore the use of killed-whole E. coli as a vaccine immunogen. Given the diversity of capsule and O-antigens in ExPEC, we have hypothesized that alternative targets are viable vaccine candidates. We have also hypothesized that immunization with a genetically engineered strain that is deficient in the capsule and O-antigen will generate a greater immune response against antigens other than the capsular and O-antigen epitopes than a wild-type strain. Lastly, we hypothesize that mucosal immunization with killed E. coli has the potential to generate a significant immune response. In this study, we demonstrated that nasal immunization with a formalin-killed ExPEC derivative deficient in capsule and O-antigen results in a significantly greater overall humoral response compared to its wild-type derivative (which demonstrates that capsule and/or the O-antigen impede the development of an optimal humoral immune response) and a significantly greater immune response against non-capsular and O-antigen epitopes. These antibodies also bound to a subset of heterologous ExPEC strains and enhanced neutrophil-mediated bactericidal activity against the homologous and a heterologous strain. Taken together, these studies support the concept that formalin-killed genetically engineered ExPEC derivatives are whole cell vaccine candidates to prevent infections due to ExPEC. |
| Databáze: | OpenAIRE |
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