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Research Article

Structural characteristics of polysaccharides that induce protection against intra-abdominal abscess formation.

A O Tzianabos, A B Onderdonk, D F Zaleznik, R S Smith, D L Kasper
A O Tzianabos
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A B Onderdonk
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D F Zaleznik
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R S Smith
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D L Kasper
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ABSTRACT

Bacteroides fragilis is the anaerobe most commonly isolated from clinical cases of intra-abdominal sepsis. In a rodent model of this disease process, intraperitoneal injection of the capsular polysaccharide complex (CPC) from B. fragilis provokes abscess formation, while subcutaneous administration of this complex confers protection against B. fragilis-induced intra-abdominal abscesses. The CPC consists of two discrete polysaccharides, polysaccharides A and B (PS A and PS B), each possessing oppositely charged structural groups critical to the ability of these carbohydrates to induce the formation of abscesses. Other bacterial polysaccharides that possess oppositely charged groups (such as the group antigen or capsular polysaccharide from Streptococcus pneumoniae type 1 strains) also exhibited potent abscess-inducing capabilities. We report here that positively and negatively charged groups on polysaccharides are also essential for inducing protection against abscess formation. Vaccination of rats with B. fragilis PS A, PS B, or the S. pneumoniae type 1 capsule protected against intra-abdominal abscesses subsequent to intraperitoneal challenge with each of these polysaccharides. Chemical conversion of the free amino or carboxyl groups on PS A to uncharged N-acetyl or hydroxymethyl groups, respectively, abrogated the ability of this polymer to confer protection against polysaccharide-mediated abscess formation. Adoptive transfer of splenic T cells from polysaccharide-vaccinated rats to naive animals demonstrated that T cells mediated this protective activity. T cells transferred from animals vaccinated with a polysaccharide repeating unit (Salmonella typhi Vi antigen) that normally contains one carboxyl group but was chemically converted to a polymer that possesses both free amino and carboxyl groups (accomplished by de-N-acetylating the Vi antigen) protected naive T-cell recipients against polysaccharide-induced abscesses. These results demonstrate that a distinct structural motif associated with the B. fragilis polysaccharides is necessary for induction of protective immunity against abscess formation associated with intra-abdominal sepsis. However, protection is not antigen specific in a traditional sense. Rather, the protective ability of these structurally dissimilar polysaccharides is conferred by, and perhaps specific for, a motif of oppositely charged groups.

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Structural characteristics of polysaccharides that induce protection against intra-abdominal abscess formation.
A O Tzianabos, A B Onderdonk, D F Zaleznik, R S Smith, D L Kasper
Infection and Immunity Nov 1994, 62 (11) 4881-4886; DOI:

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Structural characteristics of polysaccharides that induce protection against intra-abdominal abscess formation.
A O Tzianabos, A B Onderdonk, D F Zaleznik, R S Smith, D L Kasper
Infection and Immunity Nov 1994, 62 (11) 4881-4886; DOI:
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