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Detecting alloreactive T cells before kidney transplantation can prevent graft rejection. This analysis identified specific HLA alleles contributing to rejection, guiding successful second graft allocation.

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Area of Science:

  • Immunology
  • Transplantation Science
  • Nephrology

Background:

  • Cellular alloreactivity to transplant donors is not routinely assessed, posing a risk for graft rejection.
  • Acute accelerated steroid-resistant nonhumoral rejection is a significant challenge in kidney transplantation.
  • Quantifying alloreactive T cells, specifically CD4 and CD8 T cells, is crucial for understanding transplant outcomes.

Observation:

  • In nonrejecting recipients, no donor-specific alloreactive T cells were detected, though third-party reactivity was present.
  • A patient experiencing rejection showed high frequencies of alloreactive T cells against third-party controls sharing HLA alleles with the first kidney donor.
  • HLA-specific antibodies were not detected before or immediately after the initial rejection episode.

Findings:

  • The patient's high frequencies of alloreactive T cells against shared HLA alleles suggested their contribution to the first graft's rejection.
  • Excluding the identified shared HLA alleles led to the successful allocation and transplantation of a second kidney graft.
  • No alloreactive T cells were observed towards the second kidney donor, correlating with successful transplantation.

Implications:

  • Pre-transplant determination of cellular alloreactivity can identify unacceptable HLA mismatches.
  • Assessing alloreactive T cells may reduce the risk of acute cellular rejection episodes in kidney transplant recipients.
  • This approach offers a potential strategy to improve long-term graft survival and patient outcomes in transplantation.