Anti-oxidant enzymes and related elements in term and preterm newborns.
BACKGROUND
Although oxidative stress-related diseases mostly affect neonates with extremely low birthweight, healthy preterm newborns might also be at risk of oxidative damages. The aim of the present study was to verify this possibility.


METHODS
Urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG), erythrocyte glutathione peroxidase (GSHPx) and superoxide dismutase (SOD), plasma and erythrocyte concentrations of selenium, zinc and copper were measured until 100 days of life in 30 preterm infants with mean +/- SD birthweight and gestational age of 1605 +/- 122 g and 34.5 +/- 0.5 weeks. The control group included 30 term infants with birthweight 3123 158 g and gestational age 39.6 0.7 weeks.


RESULTS
Throughout the study period urinary 8-OHdG, taken as a marker of oxidative stress, was significantly higher in the preterm than in the term group. Up until 20 days of life, GSHPx activity was significantly lower in the preterm than in the term infants but this was not associated with any apparent selenium deficiency. Conversely, up until 100 days, preterm infants had significantly reduced SOD levels that appeared to reflect a shortage of the elements needed for this enzyme's activity, notably copper, the plasma concentrations of which were constantly and significantly below the control values.


CONCLUSIONS
The nutritional status of the elements related to the anti-oxidant enzymes, especially zinc and copper, should be carefully assessed in preterm infants, even if their birthweight is not extremely low.
Nassi
Niccolò
N
Department of Paediatrics, University of Florence, Florence, Italy. nassi@scibio.unifi .it
Ponziani
Vanessa
V
Becatti
Matteo
M
Galvan
Paola
P
Donzelli
Gianpaolo
G
D000080242:8-Hydroxy-2'-Deoxyguanosine; D001724:Birth Weight; D003300:Copper / Q000032:analysis; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000652:urine; D004912:Erythrocytes / Q000737:chemistry / Q000201:enzymology; D005979:Glutathione Peroxidase / Q000652:urine; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000502:physiology*; D009752:Nutritional Status; D018384:Oxidative Stress / Q000502:physiology*; D012643:Selenium / Q000097:blood; D013482:Superoxide Dismutase / Q000652:urine; D014131:Trace Elements / Q000032:analysis; D015032:Zinc / Q000032:analysis
D014131:Trace Elements; D003300:Copper; D000080242:8-Hydroxy-2'-Deoxyguanosine; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D003849:Deoxyguanosine; D012643:Selenium; D015032:Zinc