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Adipose tissue glyceride synthesis in patients with hyperapobetalipoproteinemia
1Cardiovascular Research Unit, Royal Victoria Hospital, Montréal, Qué., Canada.
Insights
Patients with hyperapobetalipoproteinemia show significantly slower fatty acid incorporation into adipose tissue glycerides compared to controls. This impaired synthesis may explain delayed triglyceride clearance in this condition.
Area of Science:
- Lipid metabolism
- Cardiovascular research
- Adipose tissue biology
Background:
- Hyperapobetalipoproteinemia is associated with delayed chylomicron triglyceride clearance.
- Understanding adipose tissue's role in lipid metabolism is crucial for cardiovascular health.
Purpose of the Study:
- To investigate differences in fatty acid incorporation into adipose tissue glycerides between patients with hyperapobetalipoproteinemia and controls.
- To explore the relationship between adipose tissue glyceride synthesis and triglyceride clearance.
Main Methods:
- Adipose tissue samples were obtained from patients with coronary artery disease (hyperapobetalipoproteinemia) and control subjects.
- In vitro assays measured the incorporation rates of linoleic and palmitic acids into diglyceride and triglyceride.
- Net lipolysis rates of adipocyte glyceride were also assessed.
Main Results:
- Fatty acid incorporation into adipose tissue glycerides was twice as rapid in control subjects compared to patients with hyperapobetalipoproteinemia.
- No significant difference was observed in the net lipolysis rate of adipocyte glyceride between the two groups.
Conclusions:
- Adipose tissue glyceride synthesis is impaired in patients with hyperapobetalipoproteinemia.
- This reduced synthesis may underlie the previously observed delayed chylomicron triglyceride clearance in this disorder.
Abstract:
Adipose tissue was obtained at thoracotomy in five control patients with valvular heart disease, all of whom were free of coronary artery disease and all of whom were normolipidemic with normal low density lipoprotein apolipoprotein B levels, and eight patients with coronary artery disease, all of whom had hyperapobetalipoproteinemia. In both groups, the rates at which linoleic acid and palmitic acid were incorporated into diglyceride and triglyceride were determined in vitro. The data indicate that fatty acid incorporation into adipose tissue glycerides was twice as rapid in controls as in patients with hyperapobetalipoproteinemia. By contrast there was no difference between the groups in the rate of net lipolysis of adipocyte glyceride. The data at hand do not establish the mechanism responsible for the difference in synthesis between normal subjects and patients with hyperapobetalipoproteinemia, but this may explain the delayed chylomicron triglyceride clearance previously observed in the disorder.