Reduced free-radical-trapping capacity and altered plasma antioxidant status in cystic fibrosis.

Abstract:

:Plasma antioxidant status and total radical-trapping antioxidant potential (TRAP) of children (n = 24) with cystic fibrosis (CF) were compared with those of children (n = 21) without the disease. Children with CF were found to have elevated plasma concentrations of ascorbic acid (94.6 +/- 58.2 mumol/L), with respect to normal children (65.6 +/- 18.8 mumol/L). Plasma uric acid (330.8 +/- 84 versus 198.0 +/- 31 mumol/L p < 0.01) and sulfhydryl group (518 +/- 43 versus 363 +/- 31 mumol/L p < 0.01) concentrations were also elevated in CF. Vitamin E levels (16.9 +/- 1.8 versus 18.4 +/- 1.3 mumol/L) were at the low end of the normal range. Despite an overall increased antioxidant array, CF patients had a reduced TRAP capacity (488 +/- 34 versus 580 +/- 79 mumol/L, p < 0.05). TRAP measurements in CF patients showed a strong negative correlation (r = 0.80, p < 0.001) with high ascorbic acid concentration, suggesting a prooxidant effect of ascorbic acid. Oral administration of ascorbic acid to adults was found to diminish TRAP activity. Concentrations of ascorbic acid similar to those seen in CF patients were attained in ascorbate-supplemented individuals, with substantial decreases in TRAP capacity. These studies suggest that high plasma ascorbic acid levels in children with CF may have a prooxidant effect. This appears to reduce the extracellular antioxidant defense of these children and may increase susceptibility to oxidative stress.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Langley SC,Brown RK,Kelly FJ

doi

10.1203/00006450-199303000-00008

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

247-50

issue

3

eissn

0031-3998

issn

1530-0447

journal_volume

33

pub_type

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