Integrative omics reveals subtle molecular perturbations following ischemic conditioning in a porcine kidney transplant model

Darragh P. O'Brien*, Adam M. Thorne, Honglei Huang, Elisa Pappalardo, Xuan Yao, Peter Søndergaard Thyrrestrup, Kristian Ravlo, Niels Secher, Rikke Norregaard, Rutger J. Ploeg*, Bente Jespersen*, Benedikt M. Kessler*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

BACKGROUND: Remote Ischemic Conditioning (RIC) has been proposed as a therapeutic intervention to circumvent the ischemia/reperfusion injury (IRI) that is inherent to organ transplantation. Using a porcine kidney transplant model, we aimed to decipher the subclinical molecular effects of a RIC regime, compared to non-RIC controls.

METHODS: Kidney pairs (n = 8 + 8) were extracted from brain dead donor pigs and transplanted in juvenile recipient pigs following a period of cold ischemia. One of the two kidney recipients in each pair was subjected to RIC prior to kidney graft reperfusion, while the other served as non-RIC control. We designed an integrative Omics strategy combining transcriptomics, proteomics, and phosphoproteomics to deduce molecular signatures in kidney tissue that could be attributed to RIC.

RESULTS: In kidney grafts taken out 10 h after transplantation we detected minimal molecular perturbations following RIC compared to non-RIC at the transcriptome level, which was mirrored at the proteome level. In particular, we noted that RIC resulted in suppression of tissue inflammatory profiles. Furthermore, an accumulation of muscle extracellular matrix assembly proteins in kidney tissues was detected at the protein level, which may be in response to muscle tissue damage and/or fibrosis. However, the majority of these protein changes did not reach significance (p < 0.05).

CONCLUSIONS: Our data identifies subtle molecular phenotypes in porcine kidneys following RIC, and this knowledge could potentially aid optimization of remote ischemic conditioning protocols in renal transplantation.

Original languageEnglish
Article number6
JournalClinical proteomics
Volume19
Issue number1
Number of pages10
ISSN1542-6416
DOIs
Publication statusPublished - 14 Feb 2022

Bibliographical note

© 2022. The Author(s).

Keywords

  • Inflammation
  • Integrative omics
  • Kidney transplantation
  • Proteomics
  • Remote ischemic conditioning
  • Transcriptomics

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