Discovering novel injury features in kidney transplant biopsies associated with TCMR and donor aging

The INTERCOMEX investigators

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We previously characterized the molecular changes in acute kidney injury (AKI) and chronic kidney disease (CKD) in kidney transplant biopsies, but parenchymal changes selective for specific types of injury could be missed by such analyses. The present study searched for injury changes beyond AKI and CKD related to specific scenarios, including correlations with donor age. We defined injury using previously defined gene sets and classifiers and used principal component analysis to discover new injury dimensions. As expected, Dimension 1 distinguished normal vs. injury, and Dimension 2 separated early AKI from late CKD, correlating with time posttransplant. However, Dimension 3 was novel, distinguishing a set of genes related to epithelial polarity (e.g., PARD3) that were increased in early AKI and decreased in T cell–mediated rejection (TCMR) but not in antibody-mediated rejection. Dimension 3 was increased in kidneys from older donors and was particularly important in survival of early kidneys. Thus high Dimension 3 scores emerge as a previously unknown element in the kidney response-to-injury that affects epithelial polarity genes and is increased in AKI but depressed in TCMR, indicating that in addition to general injury elements, certain injury elements are selective for specific pathologic mechanisms. (ClinicalTrials.gov NCT01299168).

Original languageEnglish (US)
Pages (from-to)1725-1739
Number of pages15
JournalAmerican Journal of Transplantation
Volume21
Issue number5
DOIs
StatePublished - Nov 30 2020

Bibliographical note

Publisher Copyright:
© 2020 The American Society of Transplantation and the American Society of Transplant Surgeons

Keywords

  • basic (laboratory) research/science
  • biopsy
  • kidney transplantation / nephrology
  • microarray/gene array
  • rejection
  • rejection: T cell mediated (TCMR)
  • rejection: antibody-mediated (ABMR)

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