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Oxylipin profiling of human plasma reflects the renal dysfunction in uremic patients

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Abstract

Introduction

Nearly all the enzymes that mediate the metabolism of polyunsaturated fatty acids (PUFAs) are present in the kidney. However, the correlation of renal dysfunction with PUFAs metabolism in uremic patients remains unknown.

Objectives

To test whether the alterations in the metabolism of PUFAs reflect the renal dysfunction in uremic patients.

Methods

LC–MS/MS-based oxylipin profiling was conducted for the plasma samples from the uremic patients and controls. The data were analyzed by principal component analysis (PCA) and orthogonal partial least squares-discriminant analysis (OPLS-DA). The receiver operating characteristic (ROC) curves and the correlation of the estimated glomerular filtration rate (eGFR) with the key markers were evaluated. Furthermore, qPCR analysis of the whole blood cells was conducted to investigate the possible mechanisms. In addition, a 2nd cohort was used to validate the findings from the 1st cohort.

Results

The plasma oxylipin profile distinguished the uremic patients from the controls successfully by using both PCA and OPLS-DA models. 5,6-Dihydroxyeicosatrienoic acid (5,6-DHET), 5-hydroxyeicosatetraenoic acid (5-HETE), 9(10)-epoxyoctadecamonoenoic acid [9(10)-EpOME] and 12(13)-EpOME were identified as the key markers to discriminate the patients from controls. The excellent predictive performance of these four markers was validated by ROC analysis. The eGFR significantly correlated with plasma levels of 5,6-DHET and 5-HETE positively but with plasma 9(10)-EpOME and 12(13)-EpOME negatively. The changes of these markers may account for the inactivation of cytochrome P450 2C18, 2C19, microsome epoxide hydrolase (EPHX1), and 5-lipoxygenase in the patients.

Conclusion

The alterations in plasma metabolic profile reflect the renal dysfunction in the uremic patients.

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Abbreviations

AKI:

Acute kidney injury

ARA:

Arachidonic acid

CKD:

Chronic kidney disease

COX:

Cyclooxygenase

CYP:

Cytochrome P450

EDTA:

Ethylenediaminetetraacetic acid

EDP:

Epoxydocosapentaenoic acid

EET:

Epoxyeicosatrienoic acid

eGFR:

Estimated glomerular filtration rate

DHDPE:

Dihydroxydocosapentaenoic acid

DHET:

Dihydroxyeicosatrienoic acid

DHETE:

Dihydroxyeicosatetraenoic acid

DHOME:

Dihydroxy octadecamonoenoic acid

EH:

Epoxide hydrolase

EpETE:

Epoxyeicosatetraenoic acid

EpOME:

Epoxyoctadecamonoenoic acid

EPA:

Eicosapentaenoic acid

ESRD:

End stage renal disease

HETE:

Hydroxyeicosatetrasanoic acid

HODE:

Hydroxyoctadecadienoic acid

HOTrE:

Hydroxyoctadecatrienoic acid

LA:

Linoleic acid

LOX:

Lipoxygenase

LSM:

Lipid signaling mediator

OPLS-DA:

Orthogonal partial least squares-discriminant analysis

oxo-ODE:

Oxo-octadecadienoic acid

oxo-ETE:

Oxo-eicosatetraenoic acid

PCA:

Principal component analysis

PG:

Prostaglandin or prostacyclin

PUFA:

Polyunsaturated fatty acid

ROC:

Receiver operating characteristic

TX:

Thromboxane

VIP:

Variable importance for projection

References

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Acknowledgements

This study was co-supported by Shanghai Science and Technology Committee (STCSM) Grant 17511110205 (D.-Y.H.), National Natural Science Foundation of China (NSFC) Grant 81470588 (J.-Y.L.), Fundamental Research Funds for the Central Universities Grant 2016KJ048 (Y.L.), and the Tenth People’s Hospital of Tongji University 3.50 Clinical Project DS04.99.17013 (D.-Y.H.). The authors would like to thank all the uremic patients and healthy volunteers for the participation in this study.

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Authors and Affiliations

Authors

Contributions

J-YL designed and supervised the study. D-YH, YL, and J-YL conducted sample analysis and data analysis. D-YH, C-BL, X-HL, and AP performed clinical diagnosis. D-YH, YL, C-BL, and C-YZ collected samples and clinic information. J-YL wrote the paper. All the authors critically reviewed the paper and approved the final version.

Corresponding author

Correspondence to Jun-Yan Liu.

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Conflict of interest

The authors declare no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the 1964 Helsinki declaration and its later amendments and approved by the Ethics Committee of Shanghai Tenth People’s Hospital.

Informed consent

Informed consent was obtained from all individual participants in the study.

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Cite this article

Hu, DY., Luo, Y., Li, CB. et al. Oxylipin profiling of human plasma reflects the renal dysfunction in uremic patients. Metabolomics 14, 104 (2018). https://doi.org/10.1007/s11306-018-1402-4

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  • DOI: https://doi.org/10.1007/s11306-018-1402-4

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