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Related Experiment Videos

Low molecular weight antigen arrays delete high affinity memory B cells without affecting specific T-cell help

J W Reim1, D E Symer, D C Watson

  • 1Department of Biophysics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Molecular Immunology
|December 1, 1996
PubMed
Summary

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Low molecular weight polymers with multiple epitopes suppress antibody responses by eliminating high-affinity B cells. This functional deletion of antigen-specific B cells, even with T-cell help, suggests physical deletion and long-term immune suppression.

Area of Science:

  • Immunology
  • Cellular immunology

Background:

  • T-cell dependent antibody responses can be suppressed by specific antigen arrays.
  • High-affinity memory B cells are crucial for secondary antibody responses.

Purpose of the Study:

  • To investigate the mechanism by which antigen arrays suppress T-cell dependent antibody responses.
  • To determine if suppression involves the elimination of epitope-specific B cells.

Main Methods:

  • Adoptive transfer of splenocytes from suppressed and unsuppressed donors into irradiated recipients.
  • Antigenic challenge and assessment of secondary anti-hapten antibody response.
  • Flow cytometry to quantify hapten-specific B cells.
  • Assessment of T-cell help by carrier-primed T cells.

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Main Results:

  • Adoptively transferred splenocytes from suppressed donors failed to reconstitute a secondary antibody response.
  • Suppression was dose- and duration-dependent, with minimal antigen array carryover.
  • T-cell help for B cells remained intact, but B cell responsiveness was lost.
  • Flow cytometry revealed a marked reduction in hapten-specific B cells following suppression.

Conclusions:

  • Suppressive antigen arrays induce long-term functional elimination of high-affinity, antigen-specific B cells.
  • This elimination occurs despite adequate T-cell help, indicating a B cell-intrinsic defect.
  • The long-term suppression suggests physical deletion of the antigen-specific B cell population.