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Infect. Immun., 04 1997, 1228-1236, Vol 65, No. 4
AP van Dam, A Oei, R Jaspars, C Fijen, B Wilske, L Spanjaard and J Dankert
Borrelia burgdorferi-related isolates were tested for their sensitivity to
normal human serum (NHS) and their ability to activate complement. By
dark-field microscopy, electron microscopy, and subsurface plating, it was
shown that exposure of a Borrelia garinii isolate to 10% or more NHS
resulted in immobilization, blebbing, and killing of the spirochetes. These
effects were mediated by complement, since they were not seen after heat
treatment of NHS, in the presence of EDTA, or in an agammaglobulinemic
serum. All seven B. garinii type 5 or 6 and all four VS116/M19 strains were
serum sensitive, whereas all eight Borrelia afzelii, five of eight B.
garinii type 4, and three of seven B. burgdorferi sensu stricto isolates
were serum resistant. The other isolates were partially serum sensitive.
Four serum-sensitive B. garinii isolates had been isolated from human
cerebrospinal fluid. Most likely, activation of both the alternative
pathway and the classical pathway of complement was involved, since
bactericidal activity was diminished in properdin-deficient sera as well as
in a C1q-depleted serum and in a C4-deficient serum. Bactericidal activity
could be restored when a serum lacking C1q or C4 was mixed with a
properdin- deficient serum. Isolates with various genetic backgrounds were
equally able to activate C3 as measured by enzyme-linked immunosorbent
assay. In the presence of Mg-EGTA, C3 was activated by all isolates after
exposure to > or = 10% NHS. This study shows that B. burgdorferi-
related spirochetes can be either serum sensitive or serum resistant in
vitro and that this characteristic is associated with their genetic
background.
Copyright © 1997, American Society for Microbiology
Complement-mediated serum sensitivity among spirochetes that cause Lyme disease
Department of Medical Microbiology, Academic Medical Centre, University of Amsterdam, The Netherlands. A.P.vanDam@amc.uva.nl
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