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Specific interactions between a human CD4+ clone and autologous CD4+ bifunctional immunoregulatory clones

D Naor1, G Essery, N Tarcic

  • 1Lautenberg Center for General and Tumor Immunology, Hebrew University-Hadassah Medical School, Jerusalem, Israel.

Immunological Reviews
|August 1, 1990
PubMed

Insights

Autoreactive CD4+ T-cells recognize specific determinants on other T-cells, influencing their proliferation. This interaction depends on the T-cell receptor and DR antigen, with regulatory effects varying based on target cell activation state.

Area of Science:

  • Immunology
  • Cellular Biology
  • T-cell interactions

Background:

  • Understanding T-cell communication is crucial for immune regulation.
  • Autoreactivity in T-cells can play a role in immune responses.

Purpose of the Study:

  • To investigate the cellular communication between human CD4+ T-cell clones.
  • To characterize the recognition mechanisms of autoreactive T-cells.
  • To explore the regulatory functions of autoreactive T-cells.

Main Methods:

  • Co-cultivation of human CD4+ T-cell clones.
  • Stimulation assays with autologous clones.
  • T-cell receptor modulation.
  • Inhibition studies using anti-DR monoclonal antibody.

Main Results:

  • Autoreactive clones proliferated upon stimulation with an 'inducer' clone but not irrelevant clones.
  • T-cell receptor modulation of the inducer clone abrogated interaction.
  • Anti-DR antibody blocked autoreactive clone proliferation.
  • Autoreactive clones exhibited dual regulatory effects (suppression or enhancement) on target cells based on their activation state.

Conclusions:

  • Autoreactive CD4+ T-cells recognize idiotypic-like determinants on T-cell receptors in conjunction with DR antigen.
  • The regulatory capacity of autoreactive T-cells is context-dependent, influencing target cell proliferation.
  • Differential cytokine release likely mediates these opposing regulatory effects.

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