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Related Experiment Videos

An immunoglobulin light chain dimer with CD4 antigen specificity.

J A Ledbetter1, H P Fell, L S Grosmaire

  • 1ONCOGEN, Seattle, WA 98121.

Molecular Immunology
|December 1, 1987
PubMed
Summary

A unique kappa light chain dimer (LCD) derived from an anti-CD4 hybridoma retains antigen-binding ability. This finding highlights the critical role of the light chain in determining monoclonal antibody specificity for CD4+ T lymphocytes.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Hybridoma cell lines are crucial for producing monoclonal antibodies (mAbs).
  • The G17-2 hybridoma produces an anti-CD4 mAb targeting human T lymphocytes.
  • Understanding mAb structure-function relationships is key to antibody engineering.

Purpose of the Study:

  • To investigate the antigen-binding properties of a kappa light chain dimer (LCD) derived from an anti-CD4 mAb.
  • To determine the contribution of the light chain to the antigen specificity of the parental mAb.
  • To characterize the unique LCD and its interaction with the CD4 antigen.

Main Methods:

  • Derivation of a subclone lacking the heavy chain from the G17-2 hybridoma.
  • Characterization of secreted kappa light chain dimer (LCD) binding to CD4+ T lymphocytes.

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  • Epitope mapping using competitive binding assays with different anti-CD4 mAbs.
  • Antigen-binding affinity determination using Scatchard analysis.
  • Analysis of LCD expression on hybridoma cell surface and gene structure via Southern blot.

    • Main Results:

    • A kappa light chain dimer (LCD) was secreted by the subclone and bound to CD4 antigen on T lymphocytes.
    • The LCD bound to the same epitope as the parental mAb, as shown by competitive binding.
    • Scatchard analysis revealed an association constant (Ka) of 2.2 x 10^7 M-1 for the LCD, significantly lower than the parental mAb (2.5 x 10^9 M-1).
    • The LCD was expressed on the surface of the producing hybridoma cells.
    • Southern blot confirmed a unique kappa gene transcription unit in the LCD-producing cells.

    Conclusions:

    • The kappa light chain dimer alone confers significant antigen-binding specificity for CD4.
    • The light chain plays a major role in determining the antigen specificity of the G17-2 anti-CD4 mAb.
    • This is the first reported instance of a kappa light chain dimer with unique binding capabilities to a large glycoprotein antigen.