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A case of moderate hypertriglyceridemia with apolipoprotein E phenotype E4/3

S Kojima1, Y Homma, H Sakane

  • 1Tokai University, School of Medicine, Kanagawa, Japan.

The Tokai Journal of Experimental and Clinical Medicine
|December 1, 1996
PubMed
Summary

Apolipoprotein E4 (apoE4) phenotype is linked to hypertriglyceridemia in this case study. Moderate hypertriglyceridemia resulted from overproduction of chylomicron and very low-density lipoprotein (VLDL).

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Area of Science:

  • Lipid Metabolism
  • Genetics
  • Cardiovascular Disease

Background:

  • Apolipoprotein E (apoE) phenotypes influence lipoprotein metabolism.
  • ApoE4 is typically associated with hypercholesterolemia, while apoE2 is linked to hypertriglyceridemia.
  • This study investigates a case deviating from typical associations.

Observation:

  • A case study of a patient with moderate hypertriglyceridemia and apoE phenotype E4/3 is presented.
  • The patient exhibited elevated triglyceride levels, high VLDL-C and IDL-C, low LDL-C and HDL2-C, and increased remnant-like particle cholesterol (RLP-C).
  • Lipoprotein lipase activity was normal, and LDL receptor activity was high, suggesting normal clearance pathways.

Findings:

  • Despite normal clearance mechanisms, hyperinsulinism was observed, indicating increased VLDL synthesis.

Related Experiment Videos

  • ApoE4's role in active chylomicron synthesis contributes to the overproduction of TG-rich lipoproteins.
  • The study concludes that overproduction of chylomicron and VLDL, stimulated by hyperinsulinism in an E4/3 individual, is the cause of moderate hypertriglyceridemia.

    • Implications:

    • This case highlights a potential exception to the typical lipid profiles associated with apoE phenotypes.
    • It underscores the complex interplay between genetic factors (apoE), metabolic state (hyperinsulinism), and lipoprotein metabolism.
    • Further research into apoE4's role in lipoprotein overproduction may reveal new therapeutic targets for managing hypertriglyceridemia.