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Understanding serum lipids is crucial for maintaining cardiovascular health and preventing heart disease and stroke.
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Quantifying Triglyceride-Rich Lipoprotein Atherogenicity, Associations With Inflammation, and Implications for Risk

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Triglyceride-rich lipoproteins (TRL/remnants) are approximately 4 times more likely to cause coronary heart disease (CHD) than low-density lipoprotein (LDL) particles. This finding suggests adjusting risk predictions for TRL/remnant cholesterol levels may improve accuracy.

Keywords:
LDLMendelian randomizationTRLsUK Biobankcardiovascular disease

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Area of Science:

  • Cardiovascular Genetics
  • Lipid Metabolism
  • Atherosclerosis Research

Background:

  • Triglyceride-rich lipoproteins and remnants (TRL/remnants) are causally linked to coronary heart disease (CHD), but the extent of this risk is not fully quantified.
  • Understanding the atherogenicity of different lipoprotein particles is crucial for accurate cardiovascular risk assessment.

Purpose of the Study:

  • To quantify the per-particle atherogenicity of TRL/remnants compared to low-density lipoprotein (LDL).
  • To investigate the causal relationship between TRL/remnants and systemic inflammation.
  • To determine if differences in atherogenicity impact the association of non-high-density lipoprotein cholesterol (non-HDL-C) with CHD.

Main Methods:

  • Utilized Mendelian randomization analysis on 1,357 UK Biobank participants with genome-wide association studies.
  • Ranked single nucleotide polymorphisms (SNPs) into 10 clusters based on their effect on TRL/remnant cholesterol versus LDL cholesterol.
  • Estimated coronary heart disease odds ratios (ORs) per unit increase in apolipoprotein B (apoB) and non-HDL-C, and assessed TRL/remnant association with inflammation biomarkers.

Main Results:

  • TRL/remnants were estimated to be at least 3.9 times more atherogenic than LDL particles on a per-particle basis.
  • Coronary heart disease risk increased across SNP clusters with greater TRL/remnant-C effects.
  • TRL/remnants showed causal links with inflammation, but this did not fully explain their heightened atherogenicity.

Conclusions:

  • TRL/remnants are substantially more atherogenic than LDL particles, approximately 4 times.
  • The varying atherogenicity of lipoprotein components necessitates considering the proportion of TRL/remnant-C for precise non-HDL-C based CHD risk prediction.