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Graft rejection - endogenous or allogeneic?

William R Critchley1, James E Fildes

  • 1The Transplant Centre, University Hospital of South Manchester NHS Foundation Trust, Wythenshawe Hospital, The University of Manchester, Manchester, UK.

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Endogenous stress molecules released during tissue injury can enhance immune responses to transplanted organs. Targeting these stress signals may offer new therapeutic strategies for improving transplant outcomes.

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Area of Science:

  • Immunology
  • Transplantation Biology
  • Molecular Medicine

Background:

  • Alloantigen persistence is crucial for T-cell mediated immunity following transplantation.
  • Endogenous ligands released during tissue injury may influence graft immunogenicity.
  • Stress molecules are upregulated post-transplantation, activating immune cells like dendritic cells (DCs).

Purpose of the Study:

  • To investigate the role of endogenous stress signals in modulating immune responses after transplantation.
  • To explore how stress molecules influence dendritic cell activation and alloantigen presentation.
  • To understand the impact of stress-induced cytokines on T helper cell differentiation.

Main Methods:

  • Analysis of stress molecule upregulation in transplant models.
  • Assessment of dendritic cell maturation and activation by endogenous ligands.
  • Measurement of pro-inflammatory cytokine production (IL-1β, IL-18) and inflammasome activation.
  • Evaluation of T helper type 17 versus regulatory T cell polarization.

Main Results:

  • Transplant-associated stress molecules activate dendritic cells, enhancing alloantigen presentation and co-stimulation.
  • Endogenous ligands stimulate inflammasomes, leading to increased interleukin-1β (IL-1β) and IL-18 production.
  • IL-1β influences the differentiation of T helper cells, promoting inflammatory T helper type 17 cells over regulatory T cells.

Conclusions:

  • Endogenous stress signals play a significant role in shaping adaptive immunity post-transplantation.
  • The inflammasome pathway is critical for mediating the effects of stress signals on immune cells.
  • Minimizing graft damage and associated stress molecule expression could be a potential therapeutic approach to improve transplant success.