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Related Experiment Videos

CD8+ lymphocytes augment chronic rejection in a MHC class II mismatched model.

M P Fischbein1, J Yun, H Laks

  • 1Department of Surgery, UCLA School of Medicine, University of California at Los Angeles, 90095, USA.

Transplantation
|May 26, 2001
PubMed
Summary

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Cardiac allograft vasculopathy (CAV) is driven by T lymphocytes. CD4+ T cells are essential for CAV development, while CD8+ T cells contribute to its progression, with both producing IFN-gamma.

Area of Science:

  • Immunology
  • Transplantation Biology
  • Cardiovascular Research

Background:

  • Chronic rejection, known as cardiac allograft vasculopathy (CAV), is the primary cause of late mortality in heart transplant recipients.
  • The specific roles of different T lymphocyte subsets in CAV development are not fully understood.

Purpose of the Study:

  • To elucidate the contributions of CD4+ and CD8+ T lymphocyte subsets to the development and progression of cardiac allograft vasculopathy (CAV).

Main Methods:

  • Utilized a murine model involving transplantation of donor hearts into T lymphocyte subset knockout recipients without immunosuppression.
  • Assessed intimal proliferation morphometrically and analyzed donor-specific T cell activation in vitro.
  • Investigated intragraft cytokine production using intracellular cytokine staining.

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Main Results:

  • Severe CAV developed in wild-type recipients, but was absent in CD4-/- knockout recipients (with CD8+ cells).
  • CAV occurred in CD8-/- knockout recipients (with CD4+ cells), but was significantly less severe than in wild-type.
  • CD4+ T cells were essential for CAV, while CD8+ T cells played an additive role in lesion progression.
  • MHC class II disparate alloantigens activated CD8+ T cells, and both CD4+ and CD8+ T cells produced IL-2 and IFN-gamma.

Conclusions:

  • CAV is a T lymphocyte-dependent process absolutely contingent on CD4+ T cells in this MHC class II mismatched model.
  • CD8+ T cells are activated by MHC class II disparate antigens and significantly contribute to lesion progression.
  • Both CD4+ and CD8+ T cells contribute to CAV development through IFN-gamma secretion.