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Area of Science:

  • Cardiovascular Science
  • Endocrinology
  • Metabolic Disorders

Background:

  • Gilbert syndrome is characterized by mild unconjugated hyperbilirubinemia.
  • Bilirubin is recognized as an endogenous antioxidant.
  • The study investigates oxidative stress in Gilbert syndrome patients without cardiovascular risk factors.

Purpose of the Study:

  • To evaluate the role of oxidative stress in endothelial function in patients with Gilbert syndrome.
  • To assess the impact of hyperbilirubinemia on vascular health.
  • To determine the relationship between bilirubin levels, oxidative stress markers, and endothelial function.

Main Methods:

  • A study involving 108 young men with Gilbert syndrome and 108 age-matched healthy controls.
  • Measurement of serum bilirubin, malondialdehyde-modified low-density lipoprotein (MDA-LDL), and urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG) as oxidative stress markers.
  • Assessment of flow-mediated vasodilation (FMD) to evaluate endothelial function.

Main Results:

  • Patients with Gilbert syndrome had significantly higher serum bilirubin levels (P<0.001).
  • Lower levels of oxidative stress markers (MDA-LDL and 8-OHdG) were observed in Gilbert syndrome patients (P=0.034 and P=0.001, respectively).
  • Enhanced flow-mediated vasodilation was found in patients with Gilbert syndrome compared to controls (P<0.001).

Conclusions:

  • Gilbert syndrome is associated with reduced oxidative stress and elevated bilirubin levels.
  • Hyperbilirubinemia in Gilbert syndrome correlates with improved endothelium-dependent vasodilation.
  • These findings highlight a potential protective role of bilirubin in vascular health.