Innate allorecognition by monocytic cells and its role in graft rejection

Jul 20, 2017American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons

How certain immune cells naturally recognize and react to transplanted tissue during rejection

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Abstract

Monocytes and macrophages may recognize allogeneic grafts through innate allorecognition mechanisms involving the molecule signal regulatory protein α (SIRPα).

  • Monocytes and macrophages are known to recognize microbial products and danger signals.
  • They may also respond directly to allogeneic grafts, leading to graft rejection.
  • Recent evidence suggests these immune cells can mediate graft rejection through direct cell damage and activation of alloreactive T cells.
  • The recognition mechanism involves detecting the polymorphic molecule SIRPα on donor cells.
  • Understanding this innate allorecognition could enhance knowledge of allograft rejection.

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