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Tissue Transplantation

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Tissue transplantation is a significant medical procedure involving the transfer of cells, tissues, or organs from a donor to a recipient, with the primary aim of restoring lost functions. This procedure is crucial in treating a broad spectrum of diseases, including kidney diseases, liver failure, heart disease, and certain types of cancers.
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The biology of tissue transplantation hinges on the Major Histocompatibility Complex (MHC) molecules. These molecules...
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A Modified Heterotopic Swine Hind Limb Transplant Model for Translational Vascularized Composite Allotransplantation VCA Research
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Studies Introducing Costimulation Blockade for Vascularized Composite Allografts in Nonhuman Primates.

A M Freitas1, K P Samy2, A B Farris3

  • 1Emory Transplant Center, Emory University School of Medicine, Atlanta, GA.

American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
|July 4, 2015
PubMed
Summary

Costimulation blockade, using belatacept, improved rejection-free survival in vascularized composite allografts (VCAs) in a primate model. Combining it with LFA3-Ig hindered immunity without adding rejection protection, suggesting belatacept alone is beneficial for VCA transplantation.

Keywords:
animal models: nonhuman primatecalcineurin inhibitor (CNI)costimulationfusion proteins and monoclonal antibodies: belataceptimmunosuppressantreconstructive transplantationrejectiontranslational research/sciencevascularized composite

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Area of Science:

  • Transplantation immunology
  • Regenerative medicine

Background:

  • Vascularized composite allografts (VCAs) offer reconstructive potential but face significant challenges.
  • Conventional immunosuppression, particularly calcineurin inhibitors, presents toxicity and incomplete efficacy issues in VCA transplantation.
  • Acute rejection remains a major hurdle in VCA recipients, despite current treatment options.

Purpose of the Study:

  • To evaluate the efficacy of costimulation blockade, alone and in combination with adhesion blockade, in a nonhuman-primate VCA model.
  • To assess the potential of B7-specific costimulation blockade to mitigate rejection without the adverse effects of calcineurin inhibitors.
  • To determine the adjunctive role of LFA3-Ig in combination with costimulation blockade in VCA transplantation.

Main Methods:

  • Utilized a nonhuman-primate model for vascularized composite allografts.
  • Administered immunosuppressive regimens including B7-specific costimulation blockade (belatacept) with and without LFA3-Ig.
  • Compared outcomes to tacrolimus-based immunosuppression.
  • Assessed allograft survival, T cell populations (CD2(hi) memory T cells), and histological findings using Banff grading.

Main Results:

  • Belatacept improved rejection-free allograft survival compared to tacrolimus.
  • The combination of belatacept and LFA3-Ig reduced CD2(hi) memory T cells but did not enhance allograft protection.
  • The addition of LFA3-Ig impaired protective immunity.
  • Histological findings correlated with clinical observations and Banff grading.

Conclusions:

  • Costimulation blockade with belatacept demonstrates promise for improving VCA survival by mitigating rejection.
  • Combining belatacept with LFA3-Ig may not offer additional benefits for rejection prophylaxis and could compromise protective immunity.
  • These findings support further investigation of costimulation blockade strategies in VCA transplantation using relevant preclinical models.