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. 1991 Aug 15;88(16):7175–7179. doi: 10.1073/pnas.88.16.7175

Antibodies to poly[(2----8)-alpha-N-acetylneuraminic acid] and poly[(2----9)-alpha-N-acetylneuraminic acid] are elicited by immunization of mice with Escherichia coli K92 conjugates: potential vaccines for groups B and C meningococci and E. coli K1.

S J Devi 1, J B Robbins 1, R Schneerson 1
PMCID: PMC52256  PMID: 1908091

Abstract

Meningitis and other systemic infections caused by group B Neisseria meningitidis and Escherichia coli K1 remain important problems. The capsular polysaccharides (CPs) of these pathogens (poly[(2----8)-alpha-N-acetylneuraminic acid] or poly(alpha 2-8NeuNAc] are identical and are virulence factors and protective antigens for both. CP vaccines for these pathogens are not available because poly(alpha 2-8NeuNAc) alone, as a complex or a conjugate, is poorly immunogenic. Because oligomers of poly(alpha 2-8NeuNAc) in fetal brain and other tissues bind antibodies in vitro, it has been suggested that antibodies to this CP might be pathologic. We synthesized conjugates of this CP with tetanus toxoid under conditions that avoid lactone formation. Using this scheme, we also synthesized conjugates of group C meningococcal CP (poly[(2----9)-alpha-N-acetylneuraminic acid] or poly(alpha 2-9NeuNAc] and of E. coli K92 CP [poly(alpha 2-8, alpha 2-9NeuNAc)]. When injected s.c. in saline into mice, conjugates of poly(alpha 2-8NeuNAc) or poly(alpha 2-9NeuNAc) elicited homologous antibodies. E. coli K92 conjugates elicited both poly(alpha 2-8NeuNAc) and poly(alpha 2-9NeuNAc) antibodies. Both components of the conjugates expressed T-dependent immunologic properties under conditions and dosages acceptable for clinical evaluation. Poly(alpha 2-8NeuNAc) antibodies elicited by the homologous or the K92 conjugates had lower binding activities at 37 degrees C than at 22 degrees C. "Natural" poly(alpha 2-8NeuNAc) antibodies were present in almost all matched pairs of human maternal and cord sera; most cord levels were higher than in corresponding maternal sera. These findings suggest that increased levels of poly(alpha 2-8NeuNAc) IgG antibodies elicited by our conjugates will confer protective immunity to group B meningococci and E. coli K1 and will not be pathologic.

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Selected References

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