Glycoconjugate Journal

, Volume 28, Issue 3–4, pp 165–182 | Cite as

Investigating the potential of conserved inner core oligosaccharide regions of Moraxella catarrhalis lipopolysaccharide as vaccine antigens: accessibility and functional activity of monoclonal antibodies and glycoconjugate derived sera

  • Andrew D. Cox
  • Frank St. Michael
  • Chantelle M. Cairns
  • Suzanne Lacelle
  • Amy Lea Filion
  • Dhamodharan Neelamegan
  • Cory Q. Wenzel
  • Heather Horan
  • James C. Richards
Article

Abstract

We investigated the conservation and antibody accessibility of inner core epitopes of Moraxella catarrhalis lipopolysaccharide (LPS) in order to assess their potential as vaccine candidates. Two LPS mutants, a single mutant designated lgt2 and a double mutant termed lgt2/lgt4, elaborating truncated inner core structures were generated in order to preclude expression of host-like outer core structures and to create an inner core structure that was shared by all three serotypes A, B and C of M. catarrhalis. Murine monoclonal antibodies (mAbs), designated MC2-1 and MC2-10 were obtained by immunising mice with the lgt2 mutant of M. catarrhalis serotype A strain. We showed that mAb MC2-1 can bind to the core LPS of wild-type (wt) serotype A, B and C organisms and concluded that mAb MC2-1 defines an immunogenic inner core epitope of M. catarrhalis LPS. We were unsuccessful in obtaining mAbs to the lgt2/lgt4 mutant. MAb MC2-10 only recognised the lgt2 mutant and the wt serotype A strain, and exhibited a strong requirement for the terminal N-acetyl-glucosamine residue of the lgt2 mutant core oligosaccharide, suggesting that this residue was immunodominant. Subsequently, we showed that both mAbs MC2-1 and MC2-10 could facilitate bactericidal killing of the lgt2 mutant, however neither mAb could facilitate bactericidal killing of the wt serotype A strain. We then confirmed and extended the candidacy of the inner core LPS by demonstrating that it is possible to elicit functional antibodies against M. catarrhalis wt strains following immunisation of rabbits with glycoconjugates elaborating the conserved inner core LPS antigen. The present study describes three conjugation strategies that either uses amidases produced by Dictyostelium discoideum, targeting the amino functionality created by the amidase activity as the attachment point on the LPS molecule, or a strong base treatment to remove all fatty acids from the LPS, thus creating amino functionalities in the lipid A region to conjugate via maleimide-thiol linker strategies targeting the carboxyl residues of the carrier protein and the free amino functionalities of the derived lipid A region of the carbohydrate resulted in a high loading of carbohydrates per carrier protein from these carbohydrate preparations. Immunisation derived antisera from rabbits recognised fully extended M. catarrhalis LPS and whole cells. Moreover, bactericidal activity was demonstrated to both the immunising carbohydrate antigen and importantly to wt cells, thus further supporting the consideration of inner core LPS as a potential vaccine antigen to combat disease caused by M. catarrhalis.

Keywords

Moraxella catarrhalis LPS Core oligosaccharide Monoclonal antibody Conjugate vaccine 

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Copyright information

© Her Majesty The Queen in Right of Canada 2011

Authors and Affiliations

  • Andrew D. Cox
    • 1
  • Frank St. Michael
    • 1
  • Chantelle M. Cairns
    • 1
  • Suzanne Lacelle
    • 1
  • Amy Lea Filion
    • 1
  • Dhamodharan Neelamegan
    • 1
  • Cory Q. Wenzel
    • 1
  • Heather Horan
    • 1
  • James C. Richards
    • 1
  1. 1.Institute for Biological SciencesNational Research CouncilOttawaCanada

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