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CD4 regulatory cells in immune tolerance

E H Field1, Q Gao

  • 1Department of Medicine, University of Iowa College of Medicine and the Veteran's Affairs Medical Center, Iowa City, USA.

The Journal of Laboratory and Clinical Medicine
|August 26, 1998
PubMed
Summary
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Neonatal tolerance in mice involves regulatory CD4 cells that suppress immune responses. These cells inhibit CD8 cell activation, demonstrating a link between immunoredirection and anergy in acquired tolerance.

Area of Science:

  • Immunology
  • Transplantation Immunology

Background:

  • Neonatal tolerance is a crucial immunological phenomenon.
  • Acquired tolerance mechanisms are not fully understood.
  • Regulatory immune cells play a significant role in maintaining tolerance.

Purpose of the Study:

  • To investigate the role of regulatory CD4 cells in acquired neonatal tolerance.
  • To test the hypothesis that regulatory CD4 cells inhibit effector CD8 cell responses.

Main Methods:

  • Induction of antigen-specific tolerance in neonatal BALB/c mice using semi-allogeneic spleen cells.
  • Assessment of skin graft acceptance in tolerant mice.
  • In vitro analysis of CD4 and CD8 T cell responses using BrdU assays and cytokine measurements.
  • Depletion of CD4 cells to assess their inhibitory function on CD8 cells.

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Main Results:

  • Neonatal mice injected with semi-allogeneic cells developed antigen-specific tolerance, accepting fully allogeneic skin grafts.
  • Tolerant mice exhibited diminished Th1 CD4 and CD8 immunity but enhanced Th2 CD4 responses against the foreign antigen.
  • CD4 cells from tolerant mice inhibited the proliferation and cytokine secretion of antigen-specific CD8 cells, even with IL-2 rescue.
  • Depletion of CD4 cells restored CD8 cell proliferation and function, indicating active suppression.

Conclusions:

  • Acquired neonatal tolerance is mediated by regulatory CD4 cells.
  • Regulatory CD4 cells maintain tolerance by suppressing effector CD8 cell activation, linking immunoredirection and anergy.
  • This study reveals a novel mechanism of tolerance involving CD4-mediated inhibition of CD8 cell responsiveness.