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Related Experiment Videos

Marked decrease in plasma apolipoprotein A-I and high density lipoprotein-cholesterol in a case with Werner syndrome.

J Kobayashi1, S Murano, K Yokote

  • 1Health Sciences Center Chiba University, Chiba, Japan.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|March 4, 2000
PubMed
Summary

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Werner syndrome patients may experience drastic declines in high-density lipoprotein-cholesterol (HDL-C) and apolipoprotein A-I (apo A-I) due to impaired triglyceride hydrolysis and reduced nascent HDL formation, impacting lipid metabolism.

Area of Science:

  • Biochemistry
  • Genetics
  • Clinical Medicine

Background:

  • Werner syndrome is a rare premature aging disorder.
  • Lipid metabolism disorders, including low high-density lipoprotein-cholesterol (HDL-C) and apolipoprotein A-I (apo A-I), are common in Werner syndrome.
  • The genetic basis for these lipid abnormalities is not fully understood.

Observation:

  • A 39-year-old male with Werner syndrome exhibited significant decreases in plasma HDL-C and apo A-I levels.
  • These decreases were accompanied by a reciprocal increase in plasma triglyceride (TG) levels.
  • Lipoprotein lipase (LPL) activity and mass were markedly reduced during the period of low HDL-C and apo A-I.

Findings:

  • No mutations were found in the apolipoprotein A-I (apo A-I) gene, suggesting the lipid changes are not due to direct genetic defects in apo A-I.

Related Experiment Videos

  • Impaired hydrolysis of triglycerides in triglyceride-rich lipoproteins was observed.
  • Reduced formation of nascent HDL particles was inferred from the low apo A-I and HDL-C levels.

    • Implications:

    • Decreased lipoprotein lipase (LPL) levels contribute to impaired TG hydrolysis and reduced HDL formation in this Werner syndrome patient.
    • These findings highlight a potential mechanism for dyslipidemia in Werner syndrome, independent of direct apo A-I gene mutations.
    • Understanding these mechanisms could inform future therapeutic strategies for managing lipid disorders in Werner syndrome.