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Related Experiment Videos

Autoimmune-mediated vasculopathy.

W Chen1, C J Thoburn, Y Miura

  • 1Department of Oncology, The Johns Hopkins University, Baltimore, Maryland 21231, USA.

Clinical Immunology (Orlando, Fla.)
|June 21, 2001
PubMed
Summary
This summary is machine-generated.

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Cyclosporine A (CsA) can induce autoimmune responses that lead to graft vasculopathy in organ transplants. Targeting MHC class II antigens with chloroquine may prevent this CsA-induced vascular disease.

Area of Science:

  • Immunology
  • Transplantation Biology
  • Vascular Medicine

Background:

  • Cyclosporine A (CsA) is an immunosuppressant used in organ transplantation.
  • CsA use is linked to vasculopathy, a complication of chronic rejection.
  • CsA can promote autoimmune responses by altering T cell populations.

Purpose of the Study:

  • To investigate if CsA-induced autoreactive T cells cause vascular lesions in syngeneic heart grafts.
  • To understand the mechanisms underlying CsA-associated graft vasculopathy.

Main Methods:

  • Induction of autoimmunity with CsA or adoptive transfer of CsA-induced T cells in syngeneic heart graft models.
  • Analysis of vascular changes, inflammatory infiltrates, and cytokine profiles.
  • Evaluation of MHC class II-invariant chain peptide complex as a target antigen.

Related Experiment Videos

  • Intervention with chloroquine to inhibit MHC class II upregulation.

    • Main Results:

    • Graft vasculopathy developed in CsA-treated or T cell-transferred recipients.
    • Vascular lesions showed medial inflammation, perivascular lymphocytic infiltration, and endothelial cell proliferation.
    • Disease progression correlated with a shift from Type 1 to Type 2 cytokines.
    • Upregulation of MHC class II-invariant chain peptide on endothelial cells was crucial for T cell targeting.
    • Chloroquine treatment inhibited MHC class II upregulation and halted disease progression.

    Conclusions:

    • CsA-induced autoreactive T cells can mediate graft vasculopathy.
    • The MHC class II-invariant chain peptide complex is a key target antigen in this process.
    • Inhibiting MHC class II upregulation presents a potential therapeutic strategy against CsA-induced vasculopathy.