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High-Density Lipoprotein Subfractions and Their Oxidized Subfraction Particles in Patients with Chronic Kidney
Hirokazu Honda1, Tsutomu Hirano, Masashi Ueda
1Division of Nephrology, Department of Medicine, Showa University Koto Toyosu Hospital.
Insights
In chronic kidney disease (CKD), altered high-density lipoprotein (HDL) subfractions and increased oxidized HDL particles are linked to cardiovascular disease (CVD) events. These changes, particularly oxidized HDL2, are independent risk factors for CVD in CKD patients.
Area of Science:
- Nephrology
- Cardiology
- Biochemistry
Background:
- Chronic kidney disease (CKD) is associated with dyslipidemia, including altered high-density lipoprotein (HDL) levels.
- Oxidative stress and inflammation in CKD can damage HDL particles, potentially increasing cardiovascular disease (CVD) risk.
Purpose of the Study:
- To investigate the relationship between changes in HDL subfractions (HDL2, HDL3) and their oxidized forms with CVD events in CKD patients.
- To determine if oxidized HDL particles are independent predictors of CVD in individuals with CKD.
Main Methods:
- Measured total cholesterol, LDL-C, HDL-C, HDL2, HDL3, apolipoproteins, MDA-LDL, and oxidized HDL (oxHDL, oxHDL2, oxHDL3) in CKD patients (stages 2-5, n=86) and hemodialysis patients (stage 5D, n=25).
- Followed patients for 28±9 months to record CVD events.
- Utilized Cox proportional hazards models for multivariate analyses.
Main Results:
- HDL3 and ApoA1 levels in HDL3 decreased with CKD severity; HDL2 and ApoA1 in HDL2 showed no significant difference.
- Oxidized HDL2 levels increased with CKD severity, while oxHDL3 and MDA-LDL decreased.
- High levels of oxidized HDL and its subfractions were identified as independent risk factors for CVD events in CKD patients.
Conclusions:
- HDL subfractions and their oxidized forms exhibit distinct patterns in CKD patients.
- Increased levels of oxidized HDL subfractions are implicated in the high incidence of CVD events observed in CKD populations.
Aim:
Chronic kidney disease (CKD) may lead to reduced concentrations of high-density lipoprotein (HDL) and its subfractions (HDL2 and HDL3), and damage them via inflammation and oxidative stress. The present study aimed to determine the contribution of such changes to cardiovascular disease (CVD) in patients with CKD.
Methods:
The levels of total cholesterol, low-density lipoprotein cholesterol, HDL-C, HDL2, HDL3, apolipoproteins, malondialdehyde-modified LDL (MDA-LDL), oxidized (ox) HDL, oxHDL2, and oxHDL3 were measured in blood samples from patients with CKD (stages 2-5, n=86) who were not on dialysis and from patients undergoing hemodialysis (CKD stage 5D, n=25). The patients were followed up for 28±9 months after baseline examinations and CVD events were recorded.
Result:
The levels of HDL3 and ApoA1 in HDL3 fraction decreased according to CKD severity, whereas those of HDL2 and ApoA1 in HDL2 fraction did not differ. The levels of oxHDL were similar across CKD stages. The levels of oxHDL3 and MDA-LDL were decreased, whereas those of oxHDL2 increased according to CKD severity. Multivariate analyses using the Cox proportional hazards model selected high levels of oxHDL and its subfractions, and those adjusted with HDL-C and HDL subfractions or ApoA1 in HDL fractions respectively, compared with HDL-C and HDL subfractions or ApoA1 in HDL fractions alone as independent risk factors for CVD events.
Conclusion:
The levels of HDL subfractions and their oxidized subfraction particles differed among patients with CKD. The increasing levels of oxHDL subfractions might cause a high frequency of CVD events in such patients.
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