Nonprotein-bound iron and plasma protein oxidative stress at birth.
Pediatr Res
; 58(6): 1295-9, 2005 Dec.
Article
em En
| MEDLINE
| ID: mdl-16306211
ABSTRACT
We previously reported plasma nonprotein-bound iron (NPBI) as a reliable early indicator of intrauterine oxidative stress (OS) and brain injury. We tested the hypothesis that albumin, an NPBI serum carrier, is the major target of NPBI-induced OS. Twenty-four babies were randomly selected from 384 newborns constituting the final cohort of a prospective study undertaken to evaluate the predictive role of NPBI in cord blood for neurodevelopmental outcome. Twelve were selected in the group with lowest NPBI levels (0-1.16 microM) and good neurodevelopmental outcome and 12 in the group with highest NPBI levels (>or=15.2 microM) and poor neurodevelopmental outcome. Protein carbonyl groups were identified in cord blood samples by two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) and Western blotting with anti-2,4-dinitrophenyl (DNP) antibodies. Two series of immunoreactive spots, corresponding to serum albumin and alpha-fetoprotein, were found only in the group with highest NPBI levels. We found an association between NPBI and carbonylated proteins in babies with highest NPBI levels. Since NPBI may produce hydroxyl radicals through the Fenton reaction, the major target of OS induced by NPBI is its carrier albumin. Oxidation of albumin can be expected to decrease plasma antioxidant defenses and increase the likelihood of tissue damage due to OS in the newborns.
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Base de dados:
MEDLINE
Assunto principal:
Albumina Sérica
/
Hipóxia Encefálica
/
Estresse Oxidativo
/
Ferro
Tipo de estudo:
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Female
/
Humans
/
Male
/
Newborn
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article