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Related Experiment Videos

Valve interstitial cells induce donor-specific T-cell anergy.

P Batten1, A M McCormack, M L Rose

  • 1Division of Cardiothoracic Surgery, National Heart and Lung Institute, Imperial College of Technology, Science and Medicine at Harefield Hospital, Harefield, Middlesex, United Kingdom. puspa.batten@harefield.nthames.nhs.uk

The Journal of Thoracic and Cardiovascular Surgery
|July 4, 2001
PubMed
Summary

Heart valve allografts trigger immune responses. Endothelial cells, but not interstitial cells, are immunogenic, influencing transplant outcomes.

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Area of Science:

  • Immunology
  • Cardiovascular Science
  • Transplantation Biology

Background:

  • Heart valve allografts elicit recipient T-cell immune responses, impacting graft performance.
  • The specific interactions between T cells and donor valve cells driving these responses remain unclear.

Purpose of the Study:

  • To investigate the in vitro T-cell response to valve endothelial and interstitial cells.
  • To understand the immunogenicity of different heart valve cellular components.

Main Methods:

  • Characterization of cell-surface molecules on valve endothelial and interstitial cells using flow cytometry.
  • Assessment of T-lymphocyte proliferation and immunogenicity after interferon gamma treatment.
  • Investigation of tolerance induction using a 2-step protocol.

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Main Results:

  • Both cell types express similar human leukocyte antigens and adhesion molecules, upregulated by interferon gamma.
  • T-cell responses were observed against interferon gamma-treated endothelial cells but not interstitial cells.
  • Treatment with the costimulatory molecule B7-1 reversed T-cell anergy induced by interstitial cells.

Conclusions:

  • Valve endothelial cells are immunogenic, while interstitial cells induce T-cell anergy.
  • These cell types interact in a donor-specific manner, orchestrating the immune response.
  • Findings have potential clinical relevance for heart valve allograft recipients.