Maternal-neonatal 8-hydroxy-deoxyguanosine serum concentrations as an index of DNA oxidation in association with the mode of labour and delivery.
OBJECTIVE
To investigate the effect of the mode of labour and delivery on the total antioxidant status (TAS), and the biomarker of DNA oxidation, 8-hydroxy-deoxyguanosine (8-OHdG) serum levels, in mothers and their newborns.


METHODS
Some 106 women with normal pregnancy and normal blood biochemical parameters were divided into 4 groups: Group A (n=28) with normal labour and vaginal delivery (VG), Group B (n=25) with scheduled cesarean section (CS), Group C (n=26) with 'emergency' CS, and Group D (n=27) with prolonged labour+VG. Blood was obtained from the mothers at the beginning of labour, and immediately after delivery (pre- and post-delivery), as well as from the umbilical cord (CB). TAS, 8-OHdG and creatine kinase (CK) were measured in the sera with appropriate methodology.


RESULTS
TAS levels were almost similar in all the groups pre-delivery, and in CB irrespective of the mode of labour and delivery, and remarkably decreased in Groups C and D post-delivery. 8-OHdG levels in Group C (0.94+/-0.08 ng/ml) and Group D (0.98+/-0.08 ng/ml) were significantly higher than those in Group A (0.26+/-0.01 ng/ml, p<0.001) and Group B (0.28+/-0.07 ng/ml, p<0.001) post-delivery. 8-OHdG levels were low in CB, independent of the mode of labour. CK positively correlated with 8-OHdG (r=0.48, p<0.001), the latter negatively correlated with TAS (r=-0.53, p<0.01).


CONCLUSIONS
The lowest TAS and the highest 8-OHdG levels were found in Groups C and D post-delivery, probably due to the long-term participation of the mothers' skeletal and uterus muscles, whereas 8-OHdG levels were low in CB irrespective of the mode of delivery, possibly as a consequence of the antioxidant action of the placenta and/or the low lipid levels in the serum of the umbilical cord.
Schulpis
Kleopatra H
KH
Institute of Child Health, Research Center, Department of Clinical Biochemistry Aghia Sophia Children's Hospital, and First Department of Obstetrics and Gynecology, Athens University Medical School, Greece.
Lazaropoulou
Christina
C
Vlachos
George D
GD
Partsinevelos
George A
GA
Michalakakou
Kelly
K
Gavrili
Stavroula
S
Gounaris
Antonia
A
Antsaklis
Aris
A
Papassotiriou
Ioannis
I
D000080242:8-Hydroxy-2'-Deoxyguanosine; D000328:Adult; D000975:Antioxidants / Q000032:analysis; D015415:Biomarkers / Q000097:blood; D002585:Cesarean Section; D003402:Creatine Kinase / Q000097:blood; D036861:Delivery, Obstetric; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000097:blood; D004630:Emergencies; D005260:Female; D005312:Fetal Blood / Q000737:chemistry*; D006801:Humans; D007231:Infant, Newborn; D007743:Labor, Obstetric / Q000097:blood*; D007744:Obstetric Labor Complications / Q000097:blood; D018384:Oxidative Stress / Q000502:physiology*; D049590:Postpartum Period; D011247:Pregnancy
D000975:Antioxidants; D015415:Biomarkers; D000080242:8-Hydroxy-2'-Deoxyguanosine; D003402:Creatine Kinase; D003849:Deoxyguanosine