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Apolipoprotein A-II modulates HDL remodeling in plasma
L Calabresi1, C Banfi, C R Sirtori
1Center E. Grossi Paoletti, University of Milano, Italy.
Biochimica Et Biophysica Acta
|March 4, 1992
Summary
Apolipoprotein A-II (apo A-II) dimers in high-density lipoprotein (HDL) influence its remodeling. These dimers inhibit the formation of small HDL particles during lipid exchange processes.
Area of Science:
- Lipid Metabolism
- Cardiovascular Research
- Biochemistry
Background:
- High-density lipoprotein (HDL) plays a crucial role in reverse cholesterol transport.
- HDL exists in various subclasses with distinct sizes and functions.
- Understanding HDL remodeling is key to comprehending its atheroprotective effects.
Purpose of the Study:
- To investigate the role of apolipoprotein A-II (apo A-II) dimers in HDL remodeling.
- To determine how apo A-II dimers affect the transformation of HDL particles during lipid exchange.
Main Methods:
- Incubation of native and reduced-carboxamidomethylated (RCM) HDL3 with lipoprotein-depleted plasma.
- Addition of triacylglycerol-rich particles from Intralipid.
- Analysis of HDL particle size distribution using established methods.
Main Results:
- Unmodified HDL3 were primarily converted into large HDL2b particles.
- RCM-HDL3 were transformed into both large HDL2b and small HDL3c particles.
- Apo A-II dimers were found to inhibit the formation of small HDL particles.
Conclusions:
- Apolipoprotein A-II dimers are involved in the structural remodeling of HDL particles.
- The presence of apo A-II dimers modulates HDL transformation, favoring larger particle formation.
- These findings highlight a specific mechanism by which HDL composition influences its metabolic fate.