Related Experiment Videos
Murine anti-TNP antibodies positive for either lambda 1 or lambda 2 light chains express common idiotypic
P Sanchez1, D Juy, P A Cazenave
1Département d'Immunologie, Institut Pasteur, Paris, France.
Molecular Immunology
|February 1, 1988
Summary
This study characterizes idiotopes on lambda antibodies responding to trinitrophenyl (TNP) antigens. Researchers identified shared idiotopes on anti-TNP antibodies, revealing insights into immune responses and genetic influences.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Lambda-bearing antibodies constitute a small fraction of mouse immunoglobulins but are crucial for specific immune responses.
- While lambda antibody responses to alpha (1-3)Dex and NP antigens are well-characterized, the idiotypy of the lambda-positive anti-TNP/DNP response remains poorly understood.
- Previous research indicates distinct lambda isotype usage for different antigen responses, with anti-TNP/DNP utilizing lambda 1, lambda 2, and lambda 3 isotypes.
Purpose of the Study:
- To characterize idiotopes on lambda-positive anti-trinitrophenyl (TNP) and 2,4-dinitrophenyl (DNP) antibodies.
- To investigate the genetic basis and strain-specific expression of these idiotopes.
- To elucidate the idiotypic diversity within the lambda-positive anti-TNP/DNP immune response.
Main Methods:
- Characterization of idiotopes (Id C19-3 and Id D11-2) on monoclonal anti-TNP antibodies (TNP5 and TNP9) using BALB/c mice.
- Analysis of idiotope expression across different mouse strains following TNP-Ficoll immunization.
- Investigation of the association between idiotope expression and specific VH and V lambda gene usage, as well as Igh-Va allotypic haplotypes.
Main Results:
- Two shared idiotopes, Id C19-3 and Id D11-2, were identified on BALB/c monoclonal anti-TNP antibodies utilizing lambda 1 and lambda 2 light chains, respectively.
- These idiotopes were independently expressed on other monoclonal anti-TNP/DNP antibodies, suggesting a requirement for specific VH and V lambda gene combinations.
- BALB/c mice recurrently expressed both idiotopes on lambda 1 and (lambda 2 + lambda 3) anti-TNP antibodies after TNP-Ficoll immunization, with strain-specific variations observed in SJL and SJA mice due to lambda 1 light chain expression deficits. Idiotope expression also showed strain-specific associations with the Igh-Va allotypic haplotype.
Conclusions:
- The study successfully identified and characterized novel idiotopes within the lambda-positive anti-TNP/DNP immune response.
- Idiotope expression is linked to specific VH and V lambda gene usage and influenced by genetic factors, including the Igh-Va allotypic haplotype.
- The findings contribute to a better understanding of the molecular basis and genetic regulation of antibody diversity in immune responses to haptens like TNP/DNP.