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Infect. Immun., 11 1997, 4661-4667, Vol 65, No. 11
LK Bockenstedt, E Hodzic, S Feng, KW Bourrel, A de Silva, RR Montgomery, E Fikrig, JD Radolf and SW Barthold
Antibodies to the outer surface proteins (Osps) A, B, and C of the
spirochete Borrelia burgdorferi can prevent infection in animal models of
Lyme borreliosis. We have previously demonstrated that immune serum from
mice infected with B. burgdorferi N40 can also prevent challenge infection
and induce disease regression in infected mice. The antigens targeted by
protective and disease-modulating antibodies are presently unknown, but
they do not include Osp A or Osp B. Because Osp C antibodies are present in
immune mouse serum, we investigated the ability of hyperimmune serum to
recombinant Osp C (N40) to protect mice against challenge infection with
N40 spirochetes. In both active and passive immunization studies, Osp C
(N40) antiserum failed to protect mice from challenge infection with
cultured organisms. Mice actively immunized with recombinant Osp C (N40)
were susceptible to tick-borne challenge infection, and nymphal ticks
remained infected after feeding on Osp C-hyperimmunized mice. In contrast,
similar immunization studies performed with Osp C (PKo) antiserum prevented
challenge infection of mice with a clone of PKo spirochetes pathogenic for
mice. Both Osp C (N40) and Osp C (PKo) antisera showed minimal in vitro
borreliacidal activity, and immunofluorescence studies localized Osp C
beneath the outer membrane of both N40 and PKo spirochetes. We conclude
that Osp C antibody-mediated immunity is strain specific and propose that
differences in Osp C surface expression by spirochetes in vivo may account
for strain-specific immunity.
Copyright © 1997, American Society for Microbiology
Borrelia burgdorferi strain-specific Osp C-mediated immunity in mice
Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520-8031, USA.
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