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Related Experiment Videos

Decrease in the particle size of low-density lipoprotein (LDL) by oxidation.

Atsuko Hidaka1, Kana Inoue, Sahoko Kutsukake

  • 1Department of Food Science and Nutrition, Nara Women's University, Kita-Uoya, Japan.

Bioorganic & Medicinal Chemistry Letters
|May 25, 2005
PubMed
Summary

Oxidation of low-density lipoprotein (LDL) causes fragmentation of apolipoprotein B-100 (apoB). This process leads to the formation of small dense LDL particles, impacting their structure and size.

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Area of Science:

  • Biochemistry
  • Cardiovascular Research
  • Oxidative Stress

Background:

  • Low-density lipoprotein (LDL) modification, particularly oxidation, is implicated in atherosclerosis.
  • Apolipoprotein B-100 (apoB) is the primary protein component of LDL, crucial for its structure and function.
  • Alpha-tocopherol acts as an antioxidant within LDL, protecting it from oxidative damage.

Purpose of the Study:

  • To investigate the mechanism by which LDL oxidation leads to structural changes.
  • To determine the role of alpha-tocopherol depletion in LDL modification.
  • To explore the relationship between LDL oxidation and the formation of small dense LDL particles.

Main Methods:

  • In vitro oxidation of LDL using copper ions (Cu2+).
  • Quantification of alpha-tocopherol concentration over time.

Related Experiment Videos

  • Measurement of conjugated diene formation as an indicator of lipid peroxidation (absorbance at 234 nm).
  • Analysis of apoB fragmentation and cross-linking using SDS-PAGE and immunoblotting.
  • Determination of LDL particle size using nondenaturing gradient gel electrophoresis.

    • Main Results:

    • LDL oxidation with Cu2+ led to a rapid decrease in alpha-tocopherol levels, followed by a lag phase.
    • After the lag phase, conjugated diene formation increased, indicating lipid peroxidation.
    • Apolipoprotein B-100 (apoB) fragmentation and a decrease in its molecular weight were observed.
    • LDL particle size decreased significantly during the oxidation process.
    • Oxidation of plasma LDL under different conditions (higher Cu2+ concentration) showed simultaneous decrease in alpha-tocopherol, apoB, and particle size, without a distinct lag time.

    Conclusions:

    • LDL oxidation involves a radical reaction that fragments and cross-links apoB.
    • The depletion of alpha-tocopherol precedes significant lipid peroxidation and LDL structural changes.
    • The observed changes in apoB and particle size suggest that LDL oxidation is a key factor in the generation of small dense LDL (sdLDL).