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Subclasses of LpA-I in coronary artery disease: distribution and cholesterol efflux ability
C Decossin1, G Castro, B Derudas
1Département d'études des lipides et des lipoprotéines, Unité INSERM 325, Institut Pasteur, Lille, France.
Insights
Large LpA-I particles, crucial for cholesterol efflux, were lower in men with coronary artery disease (CAD). This suggests larger LpA-I subfractions may have anti-atherogenic effects, potentially impacting cardiovascular health.
Area of Science:
- Cardiovascular Research
- Lipoprotein Metabolism
- Biochemistry
Background:
- Lipoprotein A-I (LpA-I) is implicated in cholesterol transport.
- Subfractions of LpA-I may have differential roles in cardiovascular disease (CAD).
Purpose of the Study:
- To analyze the distribution of LpA-I particle subclasses by molecular weight in men with and without symptomatic coronary artery disease (CAD).
- To investigate the association between LpA-I subclass proportions and cholesterol efflux capacity.
Main Methods:
- Gradient gel electrophoresis was used to define three LpA-I subclasses: large (L-LpA-I), intermediate (I-LpA-I), and small (S-LpA-I).
- Analysis was performed on 34 men with symptomatic CAD and 11 control subjects.
- Cholesterol efflux from Fu5AH rat hepatoma cells was measured.
Main Results:
- The proportion of L-LpA-I was significantly lower in the CAD group (37.5%) compared to the control group (58.9%).
- The proportion of I-LpA-I was significantly higher in the CAD group (31.9%) than in the control group (14.2%).
- L-LpA-I and I-LpA-I promoted cholesterol efflux, while S-LpA-I did not.
Conclusions:
- A decreased ratio of L-LpA-I in CAD patients suggests a potential anti-atherogenic effect of larger LpA-I subfractions.
- These findings highlight the importance of LpA-I subclass distribution in understanding CAD pathogenesis.
Abstract:
We analysed the distribution of LpA-I particles according to their molecular weight in 34 men with symptomatic coronary artery disease (CAD) and 11 men with no symptoms of CAD (control group). Using an original rapid and reproducible gradient gel electrophoresis technique, three LpA-I subclasses were defined: large (L-LpA-I), intermediate (I-LpA-I) and small LpA-I (S-LpA-I). The proportion of L-LpA-I was significantly lower in the CAD group (37.5 +/- 18.5%) than in the control group (58.9 +/- 15.0%) (P < 0.01). Conversely, a significantly (P < 0.05) higher proportion of I-LpA-I (31.9 +/- 20.7%) was observed in the CAD group compared with the control group (14.2 +/- 8.2%). Also, in the CAD group, the proportion of L-LpA-I was positively associated with the plasma level of LpA-I (P < 0.05) and, conversely, the proportion of S-LpA-I was negatively associated with LpA-I levels (P < 0.01). L-LpA-I and I-LpA-I from CAD patients and from control subjects were most effective in promoting cholesterol efflux from Fu5AH rat hepatoma cells, whereas S-LpA-I was ineffective in this regard. In conclusion, the decreased ratio in CAD patients of L-LpA-I, lipoprotein subspecies that are required for cholesterol efflux from cells, suggests a potential anti-atherogenic effect of these particles associated with the larger LpA-I subfractions.