Association of Small HDL Subclasses with Mortality Risk in Chronic Kidney Disease.

Area of Science:

• Cardiovascular Research
• Nephrology
• Biochemistry

Background:

• High-density lipoproteins (HDL) comprise diverse subclasses with varying functional properties.
• Smaller HDL particles exhibit potent anti-oxidative and anti-inflammatory effects.
• The role of specific HDL subclasses in chronic kidney disease (CKD) progression and mortality remains incompletely understood.

Purpose of the Study:

• To investigate the association between HDL subclass composition and all-cause mortality in patients with CKD.
• To identify specific HDL subclasses or components that serve as prognostic markers for mortality in CKD.

Main Methods:

• Nuclear magnetic resonance (NMR) spectroscopy was employed to analyze HDL subclass distribution in 463 CKD patients (stages 2-4).
• Patient mortality data were collected over a mean follow-up period of 5.0 years.
• Multivariable Cox regression and receiver operating characteristic (ROC) analyses were performed to assess associations with mortality.

Main Results:

• Deceased patients had significantly lower levels of cholesterol, ApoA-I, and ApoA-II in small and extra-small (XS) HDL subclasses compared to survivors.
• Reduced levels of XS-HDL-cholesterol, XS-HDL-ApoA-I, and XS-HDL-ApoA-II were independently associated with increased mortality risk.
• XS-HDL-ApoA-II emerged as the most potent prognostic marker for mortality.

Conclusions:

• Diminished levels of small and XS-HDL subclasses are strongly linked to elevated all-cause mortality in CKD patients.
• Assessment of HDL subclass distribution, particularly XS-HDL-ApoA-II, offers valuable clinical insights for risk stratification in CKD.
• Targeting small HDL subclasses may represent a future therapeutic strategy for improving outcomes in CKD.