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Related Experiment Videos

Lipolytically modified triglyceride-enriched HDLs are rapidly cleared from the circulation.

Shirya Rashid1, P Hugh R Barrett, Kristine D Uffelman

  • 1Department of Medicine, Division of Endocrinology, University of Toronto, Canada.

Arteriosclerosis, Thrombosis, and Vascular Biology
|March 9, 2002
PubMed
Summary

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High triglyceride levels lower HDL. Combining triglyceride enrichment with hepatic lipase action accelerates HDL clearance, explaining HDL reduction in hypertriglyceridemic states.

Area of Science:

  • Biochemistry
  • Lipid Metabolism
  • Cardiovascular Research

Background:

  • The mechanisms reducing high-density lipoprotein (HDL) in hypertriglyceridemic states are unclear.
  • Triglyceride (TG) enrichment of HDL in hypertriglyceridemia enhances HDL-associated apolipoprotein A-I (apoA-I) clearance in humans.
  • In rabbits lacking hepatic lipase (HL), TG enrichment alone does not alter HDL clearance.

Purpose of the Study:

  • To investigate the combined effects of TG enrichment and HL lipolysis on HDL apoA-I clearance in rabbits.
  • To elucidate the role of hepatic lipase in HDL metabolism during hypertriglyceridemia.

Main Methods:

  • In vivo kinetic studies were performed in New Zealand White rabbits (n=18).
  • HDL was TG-enriched ex vivo and modified by catalytically active or heat-inactivated HL.

Related Experiment Videos

  • Metabolic clearance of HDL apoA-I was measured under different conditions.

    • Main Results:

    • ApoA-I associated with TG-enriched HDL treated with active HL was cleared 22% faster than with inactive HL (P<0.05).
    • ApoA-I clearance was 26% faster compared to fasting (TG-poor) HDL treated with active HL (P<0.05).
    • A significant correlation was found between HDL TG content and apoA-I fractional catabolic rate in active HL groups (r=0.59, P<0.05).

    Conclusions:

    • TG enrichment of HDL followed by HL lipolysis significantly enhances HDL apoA-I clearance.
    • Neither TG enrichment alone nor HL lipolysis alone is sufficient to increase HDL clearance.
    • These findings highlight the crucial interaction between HDL TG enrichment and HL activity in the pathogenesis of HDL reduction during hypertriglyceridemia.