Lipid Motif of a Bacterial Antigen Enhances Immune Responses
Author Information
Author(s): Lugade Amit A., Bianchi-Smiraglia Anna, Pradhan Vandana, Elkin Galina, Murphy Timothy F., Thanavala Yasmin
Primary Institution: Roswell Park Cancer Institute
Hypothesis
Does the lipid motif of the outer membrane lipoprotein P6 from non-typeable Haemophilus influenzae play a critical role in its immunogenicity?
Conclusion
The lipid motif of the lipoprotein antigen is essential for triggering TLR2 signaling and effective stimulation of antigen-presenting cells.
Supporting Evidence
- Mice immunized with native P6 generated high titers of anti-P6 antibodies detectable as early as 2 weeks after initial immunization.
- The average peak antibody titers of mice immunized with non-lipidated rP6 were more than 10-fold lower than those observed in mice immunized with native P6.
- WT mice produced very high titers of anti-P6 Ig following immunization, whereas TLR2−/− mice had significantly lower antibody levels.
- Native P6 stimulated T cell proliferation at high levels, while non-lipidated rP6 provided minimal stimulation.
Takeaway
A special part of a bacterial protein helps the immune system recognize it better, leading to stronger defenses against infections.
Methodology
Mice were immunized with either native P6 or non-lipidated rP6, and various immune responses were measured, including antibody titers and T cell activation.
Participant Demographics
Female C57BL/6NCr (WT) and B6.129-Tlr2tm1Kir/J (TLR2−/−) mice were used.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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