Abstract
Acute kidney injury (AKI) is one of the main complications in acute care medicine and a risk factor for chronic kidney disease (CKD). AKI incidence has increased; however, its diagnosis has limitations and physiopathological mechanisms are underexplored. We investigated urine samples, aiming to identify major metabolite changes during human AKI evolution. Metabolic signatures found were further explored for a potential link to severity of injury. Twenty-four control subjects and 38 hospitalized patients with AKI were recruited and urine samples were collected at the time of diagnosis, during follow-up and at discharge. Nuclear magnetic resonance (NMR) was used in a first discovery phase for identifying potential metabolic differences. Target metabolites of interest were confirmed by liquid chromatography-mass spectrometry (LC-MS/MS) in an independent group. Underlying metabolic defects were further explored by kidney transcriptomics of murine toxic AKI. Urinary 2-hydroxybutyric acid, pantothenic acid, and hippuric acid were significantly downregulated and urinary N-acetylneuraminic acid, phosphoethanolamine, and serine were upregulated during AKI. Hippuric acid, phosphoethanolamine, and serine showed further downregulation/upregulation depending on the metabolite in acute tubular necrosis (ATN) AKI compared to prerenal AKI. Kidney transcriptomics disclosed decreased expression of cystathionase, cystathionine-β-synthase, and ethanolamine-phosphate cytidylyltransferase, and increased N-acetylneuraminate synthase as the potentially underlying cause of changes in urinary metabolites. A urinary metabolite panel identified AKI patients and provided insight into intrarenal events. A urine fingerprint made up of six metabolites may be related to pathophysiological changes in oxidative stress, energy generation, and H2S availability associated with AKI.
Key messages
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The urinary metabolome reflects AKI evolution and severity of injury.
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Kidney transcriptomics revealed enzymatic expression changes.
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Enzymatic expression changes may be the potentially underlying cause of changes in urine metabolites.
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Identified metabolite changes link oxidative stress, energy generation, and H2S availability to AKI.
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Acknowledgements
The authors thank Dolores Molero from CAI-RMN, UCM, Consuelo Agüeros from Nephrology Investigation Unit, and Servicio de Nefrología del Hospital Valdecilla. This work was supported by the Instituto de Salud Carlos III cosupported by FEDER grants [PI10/00624, PI13/01873, PI14/01650, PI15/00298, PI016/02057, PI16/01334, IF08/3667-1, CP09/00229, CPII15/00027, CP14/00133, PT13/0001/0013, intensificacion to AO, and REDinREN (RD12/0021/0001 and RD16/0009)], Fundación SENEFRO, and Fundación Conchita Rábago de Jiménez Díaz.
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Martin-Lorenzo, M., Gonzalez-Calero, L., Ramos-Barron, A. et al. Urine metabolomics insight into acute kidney injury point to oxidative stress disruptions in energy generation and H2S availability. J Mol Med 95, 1399–1409 (2017). https://doi.org/10.1007/s00109-017-1594-5
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DOI: https://doi.org/10.1007/s00109-017-1594-5