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[Lipid risk factors and their role in the pathogenesis of atherosclerosis]
1III. interní klinika LF UP a FN, Olomouc.
Insights
Cholesterol, LDL, and triacylglycerols are key lipid risk factors for ischemic heart disease. HDL
Area of Science:
- Cardiovascular Medicine
- Lipid Metabolism
- Atherosclerosis Pathogenesis
Context:
- Ischemic heart disease (IHD) is a leading cause of mortality worldwide.
- Lipid profiles are crucial indicators of cardiovascular risk.
- Understanding the role of specific lipoproteins is essential for prevention and treatment.
Purpose:
- To elucidate the primary lipid risk factors contributing to ischemic heart disease.
- To detail the pathogenic mechanisms involving cholesterol, LDL, and triacylglycerols.
- To highlight the protective functions of HDL and other antiatherogenic lipoproteins.
Summary:
- Cholesterol and low-density lipoproteins (LDL), including VLDL and oxidized LDL, play a causal role in atherosclerosis.
- Elevated triacylglycerols contribute to atherogenesis through lipoprotein heterogeneity, postprandial changes, and association with low HDL.
- High-density lipoproteins (HDL) offer protection via reverse cholesterol transport, antioxidant effects, and improved vascular tone.
Impact:
- Provides a comprehensive overview of lipid risk factors for IHD.
- Emphasizes the significance of HDL subclasses (HDL2) and Lp AI in cardiovascular health.
- Discusses the interplay of genetic and environmental factors in lipid risk variability.
Abstract:
The author presents an account on the main lipid risk factors of ischaemic heart disease. She emphasizes the causal role of cholesterol and low density lipoproteins (LDL), incl. the VLDL subclass and oxidized LDL in the pathogenesis of atherosclerosis. The atherogenic action of elevated concentrations of triacylglycerols is discussed (the importance of heterogenity of lipoproteins rich in triacyglycerols, postprandial hypertriacylglycerolaemia, combination with low concentrations of high density lipoproteins (HDL) and prothrombogenic changes). The protective role of HDL is mediated not only by their participation in the reverse cholesterol transport but also other antiatherogenic changes (antioxidant, increased prostacycline secretion, effect on the vascular tonus). Low HDL cholesterol concentrations in subjects with ischaemic heart disease indicate not only loss of these protective properties but also a pathological metabolism of lipoproteins rich in triacylglycerols with which they are metabolically associated. The author emphasizes the antiatherogenic importance of the sub-population HDL2 and of lipoprotein particles Lp AI. Lipoprotein (a) is another independent risk factor of ischaemic heart disease. The genetic determination and ratio of factors of the external environment in the variability of concentrations of all these lipid risk factors in the population is discussed.