Previous Article | Next Article ![]()
Infect. Immun., 06 1995, 2255-2261, Vol 63, No. 6
SW Barthold, E Fikrig, LK Bockenstedt and DH Persing
Outer surface protein A (OspA), which is abundantly expressed in cultured
Borrelia burgdorferi, appears to be down-regulated or masked following
low-dose infection, and OspA immunization did not prevent infection,
dissemination, or disease development with host-adapted spirochetes.
Seroconversion of mice to B. burgdorferi OspA depended on dose and
viability of inoculated spirochetes. Mice inoculated with > 10(4) live
spirochetes and > 10(7) heat-killed spirochetes seroconverted to OspA,
but mice inoculated with fewer spirochetes did not seroconvert to OspA at 2
weeks after inoculation. Growth temperature of spirochetes was not a factor
for infectious dose or seroconversion to OspA. Spirochetes grown at 30, 34,
or 38 degrees C had the same median infectious dose. Growth temperature did
not influence infectious dose when mice were inoculated intraperitoneally
or intradermally and did not influence dose-related immunologic recognition
of OspA. Mice hyperimmunized with recombinant OspA- glutathione
S-transferase (GT) fusion protein or GT (controls) were challenged by
syringe inoculation with 10(3) spirochetes or by transplantation of
infected skin from syngenic mice infected for 2 or 8 weeks.
OspA-GT-immunized mice resisted syringe challenge but developed
disseminated infections following transplantation of infected skin.
Identical results were obtained in mice passively immunized with
hyperimmune serum to OspA-GT or GT and then challenged by syringe or
infected skin transplant. The number of spirochetes in infected skin,
determined by quantitative PCR directed toward both plasmid and genomic
targets, was less than the syringe challenge dose.
Copyright © 1995, American Society for Microbiology
Circumvention of outer surface protein A immunity by host-adapted Borrelia burgdorferi
Section of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
This article has been cited by other articles:
| J. Bacteriol. | J. Virol. | Eukaryot. Cell |
|---|
| Microbiol. Mol. Biol. Rev. | Clin. Vaccine Immunol. | All ASM Journals |
|---|