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Immunogenicity studies with haptenated melittin peptides: implication for membrane involvement during the recognition
V Curcio-Vonlanthen1, H Rolli, C H Schneider
1University of Bern, Institute of Immunology and Allergology, Inselspital, Switzerland.
Summary
Melittin peptides with haptens triggered antibody responses, especially when the hapten was at the C-terminus. The B-cell recognition step, not T-cells, influenced antibody production, suggesting membrane involvement.
Area of Science:
- Immunology
- Biochemistry
Background:
- Haptenated peptides are crucial immunogens for studying antibody responses.
- The position of haptenic groups on peptides can significantly influence immunogenicity.
Purpose of the Study:
- To investigate the impact of hapten position on melittin peptides on anti-hapten IgG antibody responses.
- To elucidate the cellular mechanisms underlying the observed immune responses.
Main Methods:
- Immunization of mice and guinea pigs with melittin peptides bearing 2,4-dinitro-6-carboxyphenyl (Dncp) haptenic groups at various positions.
- Analysis of anti-hapten IgG antibody titers.
- Assessment of T-cell responses and B-cell recognition.
Main Results:
- C-terminal hapten attachment consistently elicited strong IgG responses.
- N-terminal or internal hapten placement resulted in delayed or weak responses, which improved with prolonged immunization.
- Dual haptenation, with one at the C-terminus, maintained adequate responses.
- The impairment in antibody production was linked to B-cell recognition, not T-cell defects, suggesting a role for cell membrane interactions.
Conclusions:
- The position of haptenic groups on immunogenic peptides critically affects the kinetics and magnitude of antibody responses.
- B-cell recognition, potentially involving cell membrane interactions, is a key determinant of antibody production.
- Late antibody responses should be considered in the design of protein-based vaccines.