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The affinity of low density lipoproteins for an arterial macromolecular complex. A study in ischemic heart disease
Insights
Acute coronary heart disease patients, particularly normotensive males, show increased low-density lipoprotein (LDL) affinity for arterial components. This heightened interaction, linked to LDL composition, may contribute to arterial wall deposition and disease progression.
Area of Science:
- Cardiovascular Medicine
- Lipid Metabolism
- Atherosclerosis Research
Background:
- Acute coronary heart disease (ACHD) involves complex lipid-protein interactions.
- Low-density lipoproteins (LDL) are implicated in arterial wall deposition.
- Understanding LDL's interaction with arterial components is crucial for risk assessment.
Purpose of the Study:
- To investigate serum lipid profiles and LDL insolubilization in ACHD patients.
- To determine the interaction between LDL and arterial intima-media factors.
- To explore correlations between LDL composition and its arterial affinity.
Main Methods:
- Serum analysis of cholesterol, triglycerides, and lipoprotein patterns.
- Incubation of serum LDL with arterial intima-media extracts.
- Analysis of LDL composition (cholesterol/protein plus phospholipid ratio).
- Comparison between ACHD patients (normotensive and hypertensive) and healthy controls.
Main Results:
- Male normotensive ACHD patients exhibited significantly higher LDL precipitation with arterial extracts compared to controls.
- This increased LDL-arterial factor affinity decreased after hospitalization.
- LDL composition, specifically the cholesterol/protein plus phospholipid ratio, positively correlated with arterial factor affinity.
- Hypertensive patients had higher cholesterol but similar LDL-arterial interaction compared to controls.
Conclusions:
- Altered LDL composition in normotensive ACHD patients enhances their affinity for arterial wall components.
- This increased lipoprotein-arterial interaction is a potential additional risk factor for LDL deposition in arteries.
- Findings suggest a novel mechanism contributing to atherosclerosis development.
Abstract:
Levels of serum cholesterol, triglycerides, lipoprotein pattern and the insolubilization of serum low density lipoproteins (LDL, betalipoprotein) by a factor present in arterial intima--media extracts was investigated in 55 patients with acute coronary heart disease and 50 healthy controls. In blood samples obtained 24 h after the episode, the serum betalipoproteins from male normotensive patients showed a high tendency to precipitate when incubated with the intima-media extracts, nearly twice the value measured in the control group. This affinity returned almost to control level after 21 days in the hospital. Hypertensive patients showed a serum cholesterol higher than the controls but almost no difference in LDL-arterial factor interaction. The composition of isolated LDL was studied in 7 patients and 8 controls and it was found that the total cholesterol/protein plus phospholipid ratio has a positive exponential correlation with the lipoprotein-arterial factor affinity. The results of LDL analyses suggest that a change in their composition, frequent in normotensive patients, can lead to an increased affinity of this lipoprotein for arterial intimamedia components. It is proposed that this process could be an additional risk factor contributing to the deposition of LDL in the arterial wall.