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Infect. Immun., Mar 1995, 874-883, Vol 63, No. 3
JM Leong, PE Morrissey, E Ortega-Barria, ME Pereira and J Coburn
The ability of the Lyme disease spirochete to attach to host components may
contribute to its ability to infect diverse tissues. We present evidence
that the Lyme disease spirochete expresses a lectin activity that promotes
agglutination of erythrocytes and bacterial attachment to
glycosaminoglycans. Among a diverse collection of 21 strains of Lyme
disease spirochete, hemagglutinating activity was easily detected in all
but 3 strains, and these three strains were noninfectious. The ability to
agglutinate erythrocytes was associated with the ability of the spirochete
to bind to the sulfated polysaccharide dextran sulfate and to mammalian
cells. Soluble dextran sulfate was a potent inhibitor of both
hemagglutination and attachment to mammalian cells, while dextran had no
effect on either activity, suggesting that dextran sulfate may inhibit
attachment by mimicking host cell glycosaminoglycans. Consistent with this,
the spirochete bound to immobilized heparin, and soluble heparin inhibited
bacterial adhesion to mammalian cells. The bacterium did not bind
efficiently to Vero cells treated with heparinase or heparitinase or to
mutant CHO cell lines that are deficient in proteoglycan synthesis.
Sulfation of glycosaminoglycans was critical for efficient bacterial
recognition, as Vero cells treated with an inhibitor of sulfation, or a
mutant CHO cell line that produces undersulfated heparan sulfate, did not
mediate maximal spirochetal binding. Binding of the spirochete to
extracellular matrix also appeared to be dependent upon this attachment
pathway. These findings suggest that a glycosaminoglycan-binding activity
which can be detected by hemagglutination contributes to the attachment of
the Lyme disease spirochete to host cells and matrix.
Copyright © 1995, American Society for Microbiology
Hemagglutination and proteoglycan binding by the Lyme disease spirochete, Borrelia burgdorferi
Division of Rheumatology and Immunology, Tufts-New England Medical Center Hospital, Boston, Massachusetts.
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