Abstract
To examine metabolic differences between renal allograft acute cellular rejection (ACR) and ischemic-reperfusion injury (IRI), we transplanted MHC-mismatched kidneys and induced 28 min warm-IRI, and collected the ACR and IRI kidneys as well as their respective native and collateral control kidneys. We extracted metabolites from the kidney tissues and found the lysine catabolite saccharopine 12.5-fold enriched in IRI kidneys, as well as the immunometabolites itaconate and kynurenine in ACR kidneys. Saccharopine accumulation is known to be toxic to mitochondria and may contribute to IRI pathophysiology, while itaconate and kynurenine may be reflective of counterregulatory responses to immune activation in ACR.
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Funding
This study was funded by the University of Pennsylvania (Penn) Institute for Translational Medicine and Therapeutics (to EAH, TPG, MHL, UHB); Laffey McHugh Foundation & American Society of Nephrology (to UHB); National Institutes of Health (Grant Nos. DK109203 to EAH, AG043483 to JAB, OD021391 to TPG, DK106243 to MHL, and UL1TR001878 to Penn).
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EAH, MHL, UHB, TPG, MRD: Research idea and study design; SC, PTH, ZW, CP: Data acquisition; UHB, EAH, TPG, WWH, MHL, CP, JAB: data analysis/interpretation; UHB, EAH, MRD: statistical analysis; UHB: writing manuscript; EAH, PTH, SC, WWH, MHL, TPG, MRD, CP, JAB: editing manuscript.
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Beier, U.H., Hartung, E.A., Concors, S. et al. Tissue metabolic profiling shows that saccharopine accumulates during renal ischemic-reperfusion injury, while kynurenine and itaconate accumulate in renal allograft rejection. Metabolomics 16, 65 (2020). https://doi.org/10.1007/s11306-020-01682-2
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DOI: https://doi.org/10.1007/s11306-020-01682-2