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Related Experiment Videos

Immunoregulation by processed immunoglobulin on B-cells

S K Ghosh1, D Chakrabarti

  • 1Department of Life Sciences, Indiana State University, Terre Haute 47809.

Indian Journal of Biochemistry & Biophysics
|December 1, 1993
PubMed
Summary

Idiotypic determinants (Id) on B-cells can activate both CD4+ and CD8+ T cells. These T cells have distinct roles in immune regulation, with CD8+ T cells exhibiting cytotoxic activity against B-cells expressing Id.

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Jerne's network hypothesis suggests idiotypic determinants (Id) on immunoglobulin (Ig) variable regions play immunoregulatory roles.
  • While Id-specific T-cells (CD4+) are known, the function of Id-positive Ig on B-cells in T-cell recruitment remains unclear.

Purpose of the Study:

  • To investigate the role of B-cell expressed Ig idiotypes in T-cell activation and function.
  • To elucidate the nature of Id-positive Ig on B-cells and its interaction with T-cells.

Main Methods:

  • Utilized a B-cell hybridoma (2C3) expressing anti-phthalate antibody receptors.
  • Induced Id-specific CD4+ and CD8+ T effector cells using cell membrane-associated Ig.
  • Investigated the role of MHC class I and II pathways using specific antibodies and inhibitors (BFA, chloroquine).

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Main Results:

  • Id evoked both CD4+ and CD8+ T cells, which exist as integral receptor components and processed forms on B-cells.
  • CD4+ T cells were suppressive, inducing Id-loss variants, while CD8+ T cells were cytotoxic, eliminating 2C3 cells in vitro and in vivo.
  • Induction of effector cells required membrane-associated Ig and was inhibited by anti-MHC class I antibodies, but not anti-MHC class II.
  • BFA blocked CD8+ T cell induction, suggesting MHC class I-dependent processing of membrane Ig.

Conclusions:

  • B-cell expressed Ig idiotypes can directly induce both suppressive CD4+ and cytotoxic CD8+ T cells.
  • MHC class I pathway is critical for the processing of membrane Ig to induce cytotoxic CD8+ T cells.
  • Idiotypic determinants on B-cells are involved in cellular interactions and immune regulation through T-cell activation.