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Relative atherogenicity of different plasma lipoproteins
Insights
High-density lipoprotein (HDL) levels are increasingly recognized as crucial predictors of coronary heart disease, particularly in older adults. Their role in atherogenesis is becoming clearer, independent of total cholesterol levels.
Area of Science:
- Cardiovascular Science
- Lipid Metabolism
- Atherosclerosis Research
Background:
- Early Framingham study data suggested lipoprotein fractions were no better than total cholesterol for predicting coronary heart disease.
- Recent findings highlight a strong negative correlation between high-density lipoprotein (HDL) concentration and coronary heart disease (CHD).
- This correlation is especially pronounced in older age groups where total cholesterol shows minimal predictive value for clinical events.
Purpose of the Study:
- To explore the evolving understanding of lipoprotein fractions in predicting coronary heart disease.
- To investigate the role of high-density lipoprotein (HDL) in atherogenesis.
- To examine the contribution of chylomicrons and their remnants to atherosclerosis.
Main Methods:
- Analysis of data from the Framingham study and other relevant epidemiological and biochemical studies.
- Review of animal experiments investigating cholesterol feeding and lipoprotein changes.
- Examination of the relationship between lipoprotein origins (liver vs. intestines) and atherogenic effects.
Main Results:
- High-density lipoprotein (HDL) concentration shows a significant negative correlation with coronary heart disease (CHD), particularly in older populations.
- Total serum cholesterol's predictive power for CHD diminishes in older age groups.
- Animal studies indicate cholesterol feeding can increase beta-migrating, very low-density lipoproteins, resembling chylomicron remnants.
- The atherogenic impact of low- and very low-density lipoproteins, including chylomicron remnants, is primarily linked to their contribution to total cholesterol concentration.
Conclusions:
- High-density lipoprotein (HDL) is a critical independent predictor of coronary heart disease, especially in older individuals.
- The atherogenic potential of various lipoproteins is largely determined by their contribution to overall cholesterol levels, irrespective of their intestinal or hepatic origin.
- Further research into the biochemical mechanisms of HDL in atherogenesis is warranted.
Abstract:
Originally, data from the Framingham study appeared to show that serum lipoprotein fractions were no better in predicting coronary heart disease than the total serum cholesterol. More recently, the concentration of high density lipoprotein has been shown to exhibit a strong negative correlation with coronary heart disease, especially in the older age groups in which total serum cholesterol shows little or no correlation with clinical events. Biochemical mechanisms that might clarify the role of high density lipoprotein in atherogenesis are forthcoming. Another aspect of the lipoprotein-atherogenesis question pertains to the possible role of chylomicrons. Animal experiments show that cholesterol feeding is frequently accompanied by an increase in beta-migrating, very low density lipoproteins which appear to be chylomicron remnants. The atherogenic effect of serum low- and very low-density lipoproteins, including chylomicron remnants, appears to depend more on their contribution to the total cholesterol concentration than to their origin in liver versus intestines.