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Departments of
*
Microbiology, Immunology, and Molecular Genetics and
Medicine, School of Medicine, University of California, Los Angeles, CA 90024;
Department of Infectious Diseases, Quest Diagnostics, Inc., San Juan Capistrano, CA 92690; and
§
Hybridoma Facility, Department of Microbiology, Pathology, and Parasitology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27606
The purpose of this study was to determine whether immunization with purified outer membrane vesicles (OMV) from Treponema pallidum (T.p.) could elicit Abs capable of killing this organism. It is well established that the immunization of rabbits or mice with killed T.p. or with recombinant T.p. Ags has failed to generate serum killing activity comparable with that of infection-derived immunity. Because of the small amount of T.p. OMV obtainable, a single mouse was immunized with purified OMV. The mouse anti-OMV serum and infection-derived immune rabbit serum (IRS) were compared by reactivities on two-dimensional T.p. immunoblots and by the T.p. immobilization test, a complement-dependent killing assay. Whereas IRS detected >40 Ags, the anti-OMV serum identified only 6 Ags corresponding to proteins identified previously in the outer membrane. T.p. immobilization testing showed that IRS had a 100% killing titer of 1:44 and a 50% killing titer of 1:662. By comparison, the mouse anti-OMV serum had a significantly greater 100% killing titer of 1:1,408 and a 50% killing titer of 1:16,896. Absorption of the anti-OMV serum to remove Ab against outer membrane-associated lipoproteins did not change the 100% killing titer. Freeze-fracture analysis of T.p. incubated in IRS or anti-OMV serum showed that T.p. rare membrane-spanning outer membrane proteins were aggregated. This is the first demonstration of high-titer killing Abs resulting from immunization with defined T.p. molecules; our study indicates that the targets for these Abs are T.p. rare outer membrane proteins.
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  D. R. Blanco, C. I. Champion, A. Dooley, D. L. Cox, J. P. Whitelegge, K. Faull, and M. A. Lovett A Monoclonal Antibody That Conveys In Vitro Killing and Partial Protection in Experimental Syphilis Binds a Phosphorylcholine Surface Epitope of Treponema pallidum Infect. Immun., May 1, 2005; 73(5): 3083 - 3095. [Abstract] [Full Text] [PDF]
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E. S. Shang, C. I. Champion, X.-Y. Wu, J. T. Skare, D. R. Blanco, J. N. Miller, and M. A. Lovett Comparison of Protection in Rabbits against Host-Adapted and Cultivated Borrelia burgdorferi following Infection-Derived Immunity or Immunization with Outer Membrane Vesicles or Outer Surface Protein A Infect. Immun., July 1, 2000; 68(7): 4189 - 4199. [Abstract] [Full Text] [PDF]
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A. Centurion-Lara, C. Godornes, C. Castro, W. C. Van Voorhis, and S. A. Lukehart The tprK Gene Is Heterogeneous among Treponema pallidum Strains and Has Multiple Alleles Infect. Immun., February 1, 2000; 68(2): 824 - 831. [Abstract] [Full Text] [PDF]
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