Effect of Human Breast Milk on
Urinary 8-Hydroxy-2'-Deoxyguanosine Excretion in Infants
HIROMICHI SHOJI,
SATOSHI OGUCHI, TOSHIAKI SHIMIZU and YUICHIRO
YAMASHIRO
Department of
Pediatrics, Juntendo University School of Medicine, Tokyo 113-8421, Japan
Correspondence:
Hiromichi Shoji, Department of Pediatrics, Juntendo University School of
Medicine 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan; e-mail:
hiromichi.shoji@nifty.ne.jp
During the perinatal period, oxidative stress is intimatelyinvolved in pathologic processes of serious diseases. Although
breast milk contains many antioxidants, it is not clear whether
breast milk can act as an antioxidant in infants in vivo. We
compared the oxidative stress levels in total of 41 healthy1-mo-old
infants by measuring urinary 8-hydroxy-2'-deoxyguanosine,which is
one of the biomarkers of oxidative DNA damage. Theseinfants were
divided into four groups according to the typeof feeding. Urinary
8-hydroxy-2'-deoxyguanosine excretion ofthe breast-fed group was
significantly lower than those of theartificial milk dominant
mixed-fed group or the bottle-fed group.Our data suggest that breast
milk, not artificial formula, actsas an antioxidant during infancy.
Abbreviations: 8-OHdG, 8-hydroxy-2'-deoxyguanosine ROS, reactive oxygen species
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