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Plasma triglyceride and low density lipoprotein metabolism
M J Caslake1, C J Packard, J J Series
1Institute of Biochemistry, Royal Infirmary, Glasgow, UK.
European Journal of Clinical Investigation
|February 1, 1992
Summary
High triglyceride levels increase low-density lipoprotein (LDL) apoprotein accumulation in a slower-metabolizing pool. This suggests a link between triglyceride-rich lipoproteins and LDL metabolism in healthy adults.
Area of Science:
- Lipid metabolism
- Cardiovascular research
Background:
- Low-density lipoprotein (LDL) metabolism is crucial for cardiovascular health.
- The relationship between plasma triglyceride levels and LDL kinetics requires further elucidation.
Purpose of the Study:
- To investigate the correlation between plasma triglyceride levels and LDL apoprotein (apo LDL) mass.
- To characterize the kinetic behavior of different apo LDL pools in relation to triglyceride levels.
Main Methods:
- Measurement of native and modified lipoprotein turnover in 25 healthy adults.
- Kinetic modeling to identify distinct apo LDL pools (A and B).
- Analysis of fractional catabolic rates (FCR) for apo LDL pools.
Main Results:
- A strong positive correlation was observed between plasma triglyceride and circulating apo LDL mass.
- Two distinct apo LDL pools (A and B) were identified, with pool A predominating in subjects with lower apo LDL mass and exhibiting a high FCR.
- Apoprotein accumulation in the slower-metabolizing pool B occurred with rising triglyceride and apo LDL mass, linked to increased input from triglyceride-rich very low-density lipoprotein.
Conclusions:
- Plasma triglyceride levels significantly influence LDL apoprotein kinetics.
- The findings suggest that elevated triglycerides promote the accumulation of apo LDL in a less readily catabolized pool, potentially impacting cardiovascular risk.