Rev A- Fibronectin
Department of Microbiology and Immunology, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND, USA 58202.
Previous studies indicated that the Lyme disease spirochete, Borrelia burgdorferi, expresses the RevA outer surface protein during mammalian infection. As an adhesin that promotes bacterial interaction with fibronectin, RevA appears to be a good target for preventive therapies. RevA proteins are highly conserved across all Lymeborreliae, and antibodies against RevA protein are cross-reactive among RevA proteins from diverse strains. Mice infected with B. burgdorferi mounted a rapid IgM response to RevA, followed by a strong IgG response that generally remained elevated throughout more than 12 months, suggesting continued exposure of RevA protein to the immune system. RevA antibodies were bactericidal in vitro. To evaluate the RevA antigen as a potentialvaccine, mice were vaccinated with recombinant RevA, and challenged with B. burgdorferi by needle inoculation or tick bite. Cultured tissues from all treatment groups were positive for B. burgdorferi. Vaccinated animals also appeared to have similar levels of B. burgdorferi DNA compared to non-vaccinated controls, except in the spleen. Despite its antigenicity, surface expression, and the production of bactericidal antibodies against it, RevA does not protect against Borrelia burgdorferi infection in a mouse model. However, passive immunization with anti-RevA antibodies did prevent infection, suggesting the possible utility of RevA-based immunotherapeutics or vaccine.
PMID: 23595502 [PubMed - as supplied by publisher]