Increased neutrophil chemiluminescence production in patients with cystic fibrosis.
Increased free radical production has been suggested as a possible mechanism involved in lung deterioration of patients with cystic fibrosis (CF). Vitamins A and E are known to be involved in the defense mechanism preventing damage caused by free radicals. Both vitamins are fat-soluble and are therefore malabsorbed in patients with CF. We hypothesized that low concentrations of vitamins A and E may be involved in the increased free radical production of these patients. Neutrophils' chemiluminescence and superoxide and hydrogen peroxide production were examined in 11 patients with CF aged 4 to 14 years, and 10 age-matched healthy controls. All our patients were on prolonged supplementation with vitamins A and E, but the control group was not supplemented. Serum vitamins A and E levels and neutrophil vitamin E concentrations were examined concomitantly. Chemiluminescence production was increased 10 minutes after neutrophil stimulation by phorbol myristate acetate (PMA) as compared with that in normals (20,400 +/- 9,463 v 11,990 +/- 3,778 cpm, P < .03). No difference was found in superoxide or hydrogen peroxide production between CF patients and controls. Serum vitamin A levels were significantly higher in CF patients compared with healthy controls (0.641 +/- 0.049 v 0.398 +/- 0.038 mg/L, P < .04) and so were vitamin E levels (13.94 +/- 2.25 v 5.64 +/- 1.15 mg/L, P < .05). Neutrophil vitamin E concentrations were higher in CF patients compared with healthy controls (70.8 +/- 26.0 v 23.6 +/- 9.0 micrograms/10(6) cells). We conclude that neutrophils from CF patients exhibit increased chemiluminescence activity not related to increased free radical production or fat-soluble vitamin deficiency.
Vaisman
N
N
Department of Paediatrics, Kaplan Hospital, Rehovot, Israel.
Kerasin
E
E
Hahn
T
T
Trifon
S
S
Voet
H
H
Tabachnik
E
E
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003550:Cystic Fibrosis / Q000097:blood* / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism; D008163:Luminescent Measurements; D009504:Neutrophils / Q000737:chemistry / Q000187:drug effects / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014801:Vitamin A / Q000097:blood; D014810:Vitamin E / Q000097:blood
D017382:Reactive Oxygen Species; D013481:Superoxides; D014801:Vitamin A; D014810:Vitamin E; D006861:Hydrogen Peroxide; D013755:Tetradecanoylphorbol Acetate