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Characterization of the CD8+CD45R+(2H4+) suppressor effector cell

C Morimoto1, T Takeuchi, S F Schlossman

  • 1Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, MA.

Clinical and Experimental Rheumatology
|September 1, 1989
PubMed

Insights

CD8 cells with CD45R antigen show suppressor activity after autologous mixed lymphocyte reaction (AMLR) activation. This suppressor function relies on CD45R and the CD3-T cell receptor (TCR) complex.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD8 cells play crucial roles in immune regulation.
  • Autologous mixed lymphocyte reaction (AMLR) is a model for studying T cell activation and regulation.
  • The specific subsets and molecular mechanisms underlying CD8+ cell-mediated suppression after AMLR are not fully understood.

Purpose of the Study:

  • To elucidate the molecular basis of immunoregulatory function in CD8 cells following AMLR activation.
  • To identify the specific CD8+ cell subpopulations responsible for suppressor activity post-AMLR.
  • To investigate the role of CD45R and the CD3-T cell receptor (TCR) complex in CD8+ cell-mediated suppression.

Main Methods:

  • Activation of CD8+ cells via autologous mixed lymphocyte reaction (AMLR).
  • Subsetting of CD8+ cells based on CD45R expression (CD8+CD45R+ and CD8+CD45R-).
  • Assessment of suppressor and cytotoxic activities of cell subsets.
  • Functional blockade of CD45R and CD3 using specific antibodies.

Main Results:

  • The CD8+CD45R+ subset, not CD8+CD45R-, exhibited the majority of suppressor activity after AMLR.
  • Cytotoxic activity against alloantigens was present in both CD8+CD45R+ and CD8+CD45R- subsets.
  • Treatment with anti-CD45R or anti-CD3 antibodies abolished the suppressor function of AMLR-activated CD8+ cells.

Conclusions:

  • CD45R expression defines the major suppressor subpopulation within CD8+ cells after AMLR.
  • Both CD45R and the CD3-T cell receptor (TCR) complex are critical for the suppressor function of AMLR-activated CD8+ cells.
  • These findings highlight distinct roles for CD8+ cell subsets in immune regulation and contrast with mechanisms observed in CD4+ suppressor inducer cells.

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