Abstract
Dyslipidaemia is a hallmark of chronic kidney disease (CKD). The severity of dyslipidaemia not only correlates with CKD stage but is also associated with CKD-associated cardiovascular disease and mortality. Understanding how lipids are dysregulated in CKD is, however, challenging owing to the incredible diversity of lipid structures. CKD-associated dyslipidaemia occurs as a consequence of complex interactions between genetic, environmental and kidney-specific factors, which to understand, requires an appreciation of perturbations in the underlying network of genes, proteins and lipids. Modern lipidomic technologies attempt to systematically identify and quantify lipid species from biological systems. The rapid development of a variety of analytical platforms based on mass spectrometry has enabled the identification of complex lipids at great precision and depth. Insights from lipidomics studies to date suggest that the overall architecture of free fatty acid partitioning between fatty acid oxidation and complex lipid fatty acid composition is an important driver of CKD progression. Available evidence suggests that CKD progression is associated with metabolic inflexibility, reflecting a diminished capacity to utilize free fatty acids through β-oxidation, and resulting in the diversion of accumulating fatty acids to complex lipids such as triglycerides. This effect is reversed with interventions that improve kidney health, suggesting that targeting of lipid abnormalities could be beneficial in preventing CKD progression.
Key points
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Lipidomic analyses remain a challenge due to the numerous species that exist within each class; techniques that reduce analytical complexity while retaining important information about lipid structure are useful for elucidating biological significance from lipidomics studies.
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The immense structural diversity of lipids means that lipidomic analyses are guided by a choice of untargeted and targeted analysis; sample preparation, extraction and separation methods may require optimization for specific classes of interest.
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A key challenge with profiling technologies such as lipidomics is the ability to use the data to gain insights into biological processes, including mechanisms of disease onset and progression
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Fatty acid profiles that are enriched in shorter and more saturated species are associated with later stages of chronic kidney disease (CKD) and are predictive of CKD progression.
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Acylcarnitine profiles provide insights into mitochondrial function; a lower ratio of long-chain to medium-chain acylcarnitines is indicative of increased mitochondrial inefficiency and is associated with worsening CKD.
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Patients with CKD or kidney failure demonstrate enrichment of complex lipids, such as triacylglycerols and phosphatidylethanolamines, with enrichment of longer and more unsaturated fatty acyl side-chains; an inverse association between mitochondrial efficiency and these complex lipids suggests a mechanistic link between fatty acid oxidation and fatty acid profiles.
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Acknowledgements
The authors’ work is supported by the NIH grants 5F30DK121463, T32GM007863, T32GM008322, 5T32DK101357, K08DK106523, R03DK121941, R56DK126647, R24 DK082841, P30DK089503, P30DK081943, P30DK020572, 1R01DK110541-01A1, 5U01CA235487-03 and 5R01GM114029-05, and the JDRF Center for Excellence (5-COE-2019-861-S-B). We apologize to our colleagues whose work could not be cited due to space constraints.
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J.B. wrote the first draft of the article. All authors contributed equally to all other aspects of the article.
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Nature Reviews Nephrology thanks A. Fornoni, who co-reviewed with Y. Drexler; M. Levi; and Y.-Y. Zhao for their contribution to the peer review of this work.
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Related links
LIPID MAPS database: https://www.lipidmaps.org/
Glossary
- Stereospecific number
-
(sn). Nomenclature that specifies the location of glycerol derivative side chains.
- Liquid chromatography–mass spectrometry
-
(LC–MS). A metabolomics and lipidomics technique that combines liquid chromatography separation with a mass spectrometry detection method.
- Features
-
Signals identified by the metabolomics study (e.g. in peaks in a LC–MS study defined by LC retention time and MS signal intensity).
- Isotopologues
-
Compounds that differ from each other only by a difference in the number of neutrons.
- Primary metabolic pathways
-
Metabolic pathways that generate products crucial to the biological function of the cell.
- Secondary metabolic pathways
-
Metabolic pathways that generate products that are not necessarily crucial to biological function but serve to supplement normal function (e.g. in the context of disease).
- Acylcarnitine
-
A conjugate of acyl-CoA and carnitine that can be exported between cellular membranes.
- Principal component analysis
-
A data dimensionality reduction method in which the number of variables is reduced by selecting the most significant variables.
- Cardiolipins
-
Phospholipids specific to the mitochondria that serve numerous functions including the regulation and structural organization of the electron transport chain.
- Pearson correlation coefficients
-
Measurements of the linear relationship between two continuous variables.
- Neutral lipids
-
Lipids that lack charged groups, such as triacylglycerols.
- Non-esterified fatty acids
-
Also known as free fatty acids. Fatty acids that are not conjugated to glycerol backbone.
- Kennedy pathway
-
An oestrogen receptor-based de novo phosphatidylcholine and phosphatidylethanolamine synthesis pathway.
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Baek, J., He, C., Afshinnia, F. et al. Lipidomic approaches to dissect dysregulated lipid metabolism in kidney disease. Nat Rev Nephrol 18, 38–55 (2022). https://doi.org/10.1038/s41581-021-00488-2
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DOI: https://doi.org/10.1038/s41581-021-00488-2
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