Oxidative Stress in Cystic Fibrosis: Dietary and Metabolic Factors

J Am Coll Nutr. 2001 Apr;20(2 Suppl):157-65. doi: 10.1080/07315724.2001.10719028.

Abstract

Objective: To examine oxidative stress in CF by measuring 8-iso-PGF2alpha and antioxidant defenses, in relation to dietary intake, immune function and clinical status.

Methods: We measured total plasma concentrations of 8-iso-PGF2alpha and dietary antioxidants (vitamin E, vitamin C, beta-carotene), erythrocyte antioxidant enzyme activities (glutathione peroxidase and superoxide dismutase), lung function and dietary intake in 21 CF subjects and 21 healthy age- and gender-matched controls.

Results: Total plasma 8-iso-PGF2alpha concentration (median [quartile 1-quartile 3]) was significantly higher in CF subjects compared to controls (214 pg/mL (155-331) vs. 135 pg/mL (101-168), p = 0.001). Neutrophil, monocyte and total white cell counts were elevated in the CF group and these correlated with 8-iso-PGF2alpha concentration. Despite similar dietary intake, lower plasma antioxidant concentrations were observed in the CF group (vitamin E, p < 0.001, vitamin C, p = 0.004, beta-carotene, p = 0.001). 8-iso-PGF2alpha correlated negatively with plasma vitamin E, C and beta-carotene concentrations.

Conclusion: Oxidative stress is increased in CF patients, despite normal dietary antioxidant intake. The immune response appears to be a key factor causing oxidative stress. Antioxidant intervention aimed at reducing oxidative stress in CF needs to be assessed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Antioxidants / analysis*
  • Case-Control Studies
  • Cystic Fibrosis / blood
  • Cystic Fibrosis / immunology
  • Cystic Fibrosis / metabolism*
  • Dinoprost / analogs & derivatives
  • Dinoprost / blood*
  • Erythrocytes / enzymology*
  • F2-Isoprostanes
  • Female
  • Glutathione Peroxidase / metabolism
  • Humans
  • Leukocytes
  • Male
  • Oxidative Stress*
  • Respiratory Function Tests
  • Superoxide Dismutase / metabolism
  • Vitamins / administration & dosage
  • Vitamins / blood*

Substances

  • Antioxidants
  • F2-Isoprostanes
  • Vitamins
  • 8-epi-prostaglandin F2alpha
  • Dinoprost
  • Glutathione Peroxidase
  • Superoxide Dismutase