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Cellular Microbiology: Pathogen-Host Cell Molecular Interactions

Sialic Acid-Binding Immunoglobulin-Like Lectin 7 Mediates Selective Recognition of Sialylated Glycans Expressed on Campylobacter jejuni Lipooligosaccharides

Tony Avril, Eric R. Wagner, Hugh J. Willison, Paul R. Crocker
Tony Avril
1Wellcome Trust Biocentre, University of Dundee, Dow Street, Dundee DD1 5EH, United Kingdom
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Eric R. Wagner
2Division of Clinical Neurosciences, University of Glasgow, Southern General Hospital, Glasgow G51 4TF, United Kingdom
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Hugh J. Willison
2Division of Clinical Neurosciences, University of Glasgow, Southern General Hospital, Glasgow G51 4TF, United Kingdom
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Paul R. Crocker
1Wellcome Trust Biocentre, University of Dundee, Dow Street, Dundee DD1 5EH, United Kingdom
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  • For correspondence: p.r.crocker@dundee.ac.uk
DOI: 10.1128/IAI.02094-05
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ABSTRACT

siglecs are a family of sialic-acid binding immunoglobulin-like lectins mostly expressed by cells of the immune system that have the potential to interact with sialylated glycans expressed not only on host cells but also on certain pathogens. Campylobacter jejuni is a common pathogen of humans that expresses surface lipooligosaccharides (LOS) that can be modified with ganglioside-like terminal structures in the core oligosaccharides. In this study, we examined the interaction of 10 siglecs with LOS purified from four different C. jejuni isolates expressing GM1-like, GD1a-like, GD3-like, and GT1a-like oligosaccharides. Of all siglecs examined, only Siglec-7 exhibited specific, sialic acid-dependent interactions with C. jejuni LOS in solid-phase binding assays. Binding was especially prominent with LOS from the HS:19(GM1+ GT1a+) isolate, with weaker binding with LOS from the HS:19(GD3+) isolate. Binding of Siglec-7 was also observed with intact bacteria expressing these LOS structures. Specific binding of HS:19(GM1+ GT1a+) bacteria was demonstrated with Siglec-7 expressed on transfected Chinese hamster ovary cells and with peripheral blood leukocytes, among which HS:19(GM1+ GT1a+) bacteria bound selectively to both natural killer cells and monocytes which naturally express Siglec-7. These results raise the possibility that, in addition to their role in generating autoimmune antibody responses, C. jejuni LOS could interact with Siglec-7 expressed by leukocytes, modulate the host-pathogen interaction, and contribute to the clinical outcome and the development of secondary complications such as Guillain-Barré syndrome.

  • Copyright © 2006 American Society for Microbiology
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Sialic Acid-Binding Immunoglobulin-Like Lectin 7 Mediates Selective Recognition of Sialylated Glycans Expressed on Campylobacter jejuni Lipooligosaccharides
Tony Avril, Eric R. Wagner, Hugh J. Willison, Paul R. Crocker
Infection and Immunity Jun 2006, 74 (7) 4133-4141; DOI: 10.1128/IAI.02094-05

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Sialic Acid-Binding Immunoglobulin-Like Lectin 7 Mediates Selective Recognition of Sialylated Glycans Expressed on Campylobacter jejuni Lipooligosaccharides
Tony Avril, Eric R. Wagner, Hugh J. Willison, Paul R. Crocker
Infection and Immunity Jun 2006, 74 (7) 4133-4141; DOI: 10.1128/IAI.02094-05
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KEYWORDS

Antigens, Bacterial
Antigens, Differentiation, Myelomonocytic
Campylobacter jejuni
Lectins
Lipopolysaccharides
N-Acetylneuraminic Acid
Polysaccharides, Bacterial

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