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VLDL compositional changes and plasma levels of triglycerides and high density lipoprotein
F D Brites1, C D Bonavita, M Cloës
1Department of Clinical Biochemistry, School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina.
Summary
Altered VLDL composition, marked by increased triglycerides and apoB, is linked to hypertriglyceridemia and low HDL cholesterol. This suggests a critical role for cholesteryl ester transfer in VLDL and HDL metabolism.
Area of Science:
- Lipid metabolism and cardiovascular disease research.
- Biochemistry of lipoprotein structure and function.
Background:
- Very-low-density lipoprotein (VLDL) chemical composition is intrinsically linked to plasma triglyceride and high-density lipoprotein (HDL)-cholesterol levels.
- Understanding these relationships is crucial for managing dyslipidemias.
Purpose of the Study:
- To investigate VLDL composition in patients with primary hypertriglyceridemia, with or without hypoalphalipoproteinemia, and in normotriglyceridemic subjects with hypoalphalipoproteinemia.
- To identify specific lipoprotein alterations associated with different dyslipidemic states.
Main Methods:
- Evaluation of VLDL triglyceride and apolipoprotein B (apoB) content.
- Quantification of lipoprotein C-III:B (LpC-III:B) and lipoprotein E:B (LpE:B) levels.
- Measurement of cholesteryl ester transfer protein (CETP) activity.
Main Results:
- All evaluated groups showed VLDL enrichment in triglycerides and apoB.
- LpC-III:B levels were elevated in hypertriglyceridemic patients with low or normal HDL-cholesterol.
- LpE:B concentration increased in hypertriglyceridemic patients with normal HDL-cholesterol, and CETP activity was higher in those with low HDL-cholesterol.
Conclusions:
- The most atypical VLDL particles were observed in patients with both VLDL accumulation and reduced HDL-cholesterol.
- These findings highlight the cholesteryl ester-triglyceride transfer as a key factor influencing VLDL composition and HDL levels in dyslipidemia.