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Assessment of Vascular Function in Patients With Chronic Kidney Disease
Published on: June 16, 2014
Plasma lipidomic profiling identifies a novel complex lipid signature associated with ischemic stroke in chronic
Farsad Afshinnia1, Adil Jadoon1, Thekkelnaycke M Rajendiran2,3
1University of Michigan, Department of Internal Medicine-Nephrology, Ann Arbor, MI.
Insights
Plasma lipid alterations, including phosphatidylcholines (PCs) and phosphatidylethanolamines (PEs), are associated with stroke in patients with chronic kidney disease (CKD). These lipid changes may serve as novel risk factors for stroke.
Area of Science:
- Biochemistry
- Metabolomics
- Nephrology
Background:
- Dyslipidemia is a known contributor to ischemic stroke.
- However, the specific plasma lipidomic profiles associated with stroke in individuals with chronic kidney disease (CKD) remain understudied.
Purpose of the Study:
- To identify and characterize plasma lipid alterations linked to stroke in patients with CKD.
- To explore the potential of these lipid changes as risk factors for stroke in this population.
Main Methods:
- A cross-sectional study involving 214 participants from the Clinical Phenotyping and Resource Biobank Core (CPROBE).
- Plasma samples were analyzed using liquid chromatography/mass spectrometry-based untargeted lipidomics.
- Statistical analyses included t-tests with false discovery rate adjustment and logistic regression to identify independent lipid predictors of stroke.
Main Results:
- Over 330 lipid compounds were identified, with significant overrepresentation of phosphatidylcholines (PCs) and phosphatidylethanolamines (PEs) in patients with stroke.
- Elevated levels of palmitate and PC38:4 were independently associated with a higher risk of stroke.
- Trends toward increased abundance of PCs, PEs, plasmenyl-PEs (pPEs), and sphingomyelins were observed in stroke patients.
Conclusions:
- Differential regulation of specific lipids, including palmitate, PCs, and PEs, is observed in CKD patients with a history of stroke.
- These lipid alterations may represent a novel, unrecognized risk factor for stroke in CKD.
- Further research is needed to determine the temporal relationship and potential for risk stratification and modification.
Rationale And Objective:
Despite contribution of dyslipidemia to ischemic stroke, plasma lipidomic correlates of stroke in CKD is not studied. This study is aimed to identify plasma lipid alterations associated with stroke.
Study Design:
Cross sectional.
Setting And Population:
214 participants of Clinical Phenotyping and Resource Biobank Core (CPROBE). Clinical data and plasma samples at the time of recruitment were obtained and used to generate lipidomic data by liquid chromatography/mass-spectrometry-based untargeted platform.
Predictors:
Various levels of free fatty acids, acylcarnitines and complex lipids.
Outcome:
Stroke.
Analytic Approach:
includes compound by compound comparison of lipids using t-test adjusted by false discovery rate in patients with and without stroke, and application of logistic regression analysis to identify independent lipid predictors of stroke and to estimate the odds associated with their various levels.
Results:
Overall, we identified 330 compounds. Enrichment analysis revealed overrepresentation of differentially regulated phosphatidylcholines (PC)s and phosphatidylethanolamines (PE)s were overrepresented in stroke (P<0.001). Abundance of PC38:4, PE36:4, PC34:0, and palmitate were significantly higher, but those of plasmenyl-PE (pPE)38:2, and PE 32:2 was significantly lower in patients with stroke (p≤0.0014). After adjusting, each 1-SD increase in palmitate and PC38:4 was independently associated with 1.84 fold (95% CI: 1.06-3.20, p=0.031) and 1.84 fold (1.11-3.05, p=0.018) higher risk of stroke, respectively. We observed a significant trend toward higher abundance of PCs, PEs, pPEs, and sphingomyelins in stroke (p≤0.046).
Limitations:
Small sample size; unclear, if similar changes in the same or opposite direction preceded stroke, as the cross-sectional nature of the observation does not allow determining the effect of time course on lipid alterations.
Conclusion:
Differential regulation of palmitate, PCs, and PEs in patients with CKD and a history of stroke may represent a previously unrecognized risk factor and might be a target of risk stratification and modification.
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