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Published on: November 10, 2017
Mendelian randomization analysis of cholesteryl ester transfer protein and subclinical atherosclerosis: A
Tim Christen1, Stella Trompet2, Raymond Noordam2
1Department of Clinical Epidemiology, Leiden University Medical Center (LUMC), Leiden, The Netherlands.
Insights
This study found no causal link between cholesteryl ester transfer protein (CETP) levels and atherosclerosis in the general population. However, differing effects were observed in men and women, suggesting potential associations in specific subgroups.
Area of Science:
- Cardiovascular Disease Research
- Genetics and Epidemiology
- Lipid Metabolism
Background:
- Previous trials inhibiting cholesteryl ester transfer protein (CETP) for cardiovascular disease prevention have largely failed.
- The causal relationship between CETP and atherosclerosis remains unclear.
Purpose of the Study:
- To investigate the causal relationship between genetically determined CETP concentration and carotid intima-media thickness (cIMT).
- To analyze this relationship in a population-based cohort using Mendelian randomization.
Main Methods:
- Utilized data from the Netherlands Epidemiology of Obesity study.
- Genotyped participants and measured cIMT via ultrasonography.
- Employed a weighted genetic risk score for CETP based on 3 single-nucleotide polymorphisms.
Main Results:
- No causal relation was found between genetically determined CETP and cIMT in the total population of 5655 participants.
- Directionally differing associations were observed between men and women.
- Potential associations were noted in normoglycemic men and (pre)diabetic women, requiring further replication.
Conclusions:
- Genetically determined CETP concentration does not appear to have a causal relationship with cIMT in the general population.
- Observed sex-specific effects and associations in stratified subgroups warrant further investigation.
- Replication studies are needed to confirm findings in individuals with specific cardiometabolic risk profiles.
Background:
Several trials to prevent cardiovascular disease by inhibiting cholesteryl ester transfer protein (CETP) have failed, except Randomized EValuation of the Effects of Anacetrapib through Lipid-modification. Thus far, it is unclear to what extent CETP is causally related to measures of atherosclerosis.
Objective:
The aim of the article was to study the causal relationship between genetically determined CETP concentration and carotid intima-media thickness (cIMT) in a population-based cohort study.
Methods:
In the Netherlands Epidemiology of Obesity study, participants were genotyped, and cIMT was measured by ultrasonography. We examined the relation between a weighted genetic risk score for CETP concentration, based on 3 single-nucleotide polymorphisms that have previously been shown to largely determine CETP concentration and cIMT using Mendelian randomization in the total population and in strata by sex, Framingham 10-year risk, (pre)diabetes, high-density lipoprotein cholesterol, triglycerides, and statin use.
Results:
We analyzed 5655 participants (56% women) with a mean age of 56 (range 44-66) years, body mass index of 26 (range 17-61) kg/m2, and serum CETP of 2.47 (range 0.68-5.33) μg/mL. There was no evidence for a causal relation between genetically determined CETP and cIMT in the total population, but associations were differently directed in men (16 μm per μg/mL increase in genetically determined CETP; 95% confidence interval: -8, 39) and women (-8 μm; -25, 9). Genetically determined CETP appeared to be associated with cIMT in normoglycemic men (26 μm; -1, 52) and in (pre)diabetic women (48 μm; -2, 98).
Conclusion:
In this population-based study, there was no causal relation between genetically determined CETP concentration and cIMT in the total population although we observed directionally differing effects in men and women. Stratified results suggested associations in individuals with different cardiometabolic risk factor profiles, which require replication.
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