Abstract
Purpose
Diabetic kidney disease (DKD) is the most common complication of type 2 diabetes mellitus (T2DM), and its pathogenesis is not yet fully understood and lacks noninvasive and effective diagnostic biomarkers. In this study, we performed urine metabolomics to identify biomarkers for DKD and to clarify the potential mechanisms associated with disease progression.
Methods
We applied a liquid chromatography–mass spectrometry-based metabolomics method combined with bioinformatics analysis to investigate the urine metabolism characteristics of 79 participants, including healthy subjects (n = 20), T2DM patients (n = 20), 39 DKD patients that included 19 DKD with microalbuminuria (DKD + micro) and 20 DKD with macroalbuminuria (DKD + macro).
Results
Seventeen metabolites were identified between T2DM and DKD that were involved in amino acid, purine, nucleotide and primarily bile acid metabolism. Ultimately, a combined model consisting of 2 metabolites (tyramine and phenylalanylproline) was established, which had optimal diagnostic performance (area under the curve (AUC) = 0.94). We also identified 19 metabolites that were co-expressed within the DKD groups and 41 metabolites specifically expressed in the DKD + macro group. Ingenuity pathway analysis revealed three interaction networks of these 60 metabolites, involving the sirtuin signaling pathway and ferroptosis signaling pathway, as well as the downregulation of organic anion transporter 1, which may be important mechanisms that mediate the progression of DKD.
Conclusions
This work reveals the metabolic alterations in T2DM and DKD, constructs a combined model to distinguish them and delivers a novel strategy for studying the underlying mechanism and treatment of DKD.
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Acknowledgements
This work was supported by the Guangdong Province Blood Depuration Clinical Engineering Technology Research Center (No: 507204531040); the 2019 Dongguan Social Science and Technology Development (key) project (No: 201950715002195); the Guangdong Province Union Training Postgraduate Demonstration base (No: 20190630); the Guangdong Science and Technology Projects (No: 2020A1313030112); the Guangzhou International Conference capital construction project (No: X20210101); the Postdoctoral Fund of the First Affiliated Hospital, Jinan University (No. 809001); the Young Innovative Talents Project of General Colleges and Universities in Guangdong Province (No. 2018KQNCX010); the GuangDong Basic and Applied Basic Research Foundation (No. 2020A1515111209); and the Key Diabetes Specialty Construction of Liwan District People’s Hospital (Grant No: 201804001). We thank Bioruqi (Guangzhou, China) for technical assistance and analysis guidance.
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Luo, M., Zhang, Z., Lu, Y. et al. Urine metabolomics reveals biomarkers and the underlying pathogenesis of diabetic kidney disease. Int Urol Nephrol 55, 1001–1013 (2023). https://doi.org/10.1007/s11255-022-03326-x
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DOI: https://doi.org/10.1007/s11255-022-03326-x