Abstract
BackgroundThe profile of sirtuin 3 (SIRT3), 8-hydroxy-2′-deoxyguanosine (8-OHdG), brain-derived neurotrophic factor (BDNF) and serotonin (5-HT) in cord blood and in early breast milk was studied and it was related to perinatal factors. 5-HT and BDNF signalling systems have been claimed to play a critical role in intrauterine development, postnatal adaptation and lactation. Since prematurity and Caesarean birth are frequently associated with inflammation and related oxidative stress, an attempt was made to reveal the adaptive changes of the protective SIRT3 and the complex interplay among these bioactive components in cord blood and early breast milk.MethodsThree groups each consisting of 30 mothers were included in the study: mothers who underwent spontaneous vaginal birth at term (group I), Caesarean section at term (group II) and preterm birth (group III). Venous cord blood and early breast milk samples were collected for measuring the biomarkers. SIRT3, 8-OHdG, BDNF and 5-HT levels were determined by using commercially available ELISA kits.ResultsIt was demonstrated that cord blood levels of SIRT3, BDNF and 5-HT were markedly reduced whereas those of 8-OHdG were significantly elevated after preterm birth when compared with birth at term. The Caesarean section was associated with a moderate decrease in BDNF and 5-HT, however, both SIRT3 and 8-OHdG remained unaffected. Breast milk levels of all biomarkers studied proved to be independent of their corresponding cord blood concentrations. In response to preterm birth breast milk SIRT3, 8-OHdG and 5-HT increased significantly, while a drastic fall occurred in BDNF. A significant positive relationship was found of 5-HT with SIRT3 and 8-OHdG irrespective of the gestational age and the mode of delivery.ConclusionsIt is suggested that the selected biomarkers in the breast milk mostly derive from local production by the mammary glands and 5-HT may have an essential role in the control of this process.
Highlights
The profile of sirtuin 3 (SIRT3), 8-hydroxy-2′-deoxyguanosine (8-OHdG), brain-derived neurotrophic factor (BDNF) and serotonin (5-HT) in cord blood and in early breast milk was studied and it was related to perinatal factors. 5-HT and BDNF signalling systems have been claimed to play a critical role in intrauterine development, postnatal adaptation and lactation
It can be seen that serum SIRT3 levels were unaffected by the mode of term birth, it was markedly reduced in preterm as compared to the fullterm groups [vaginal birth and Caesarean section]
Breast milk levels of SIRT3 much exceeded those measured in the cord blood, with significant difference in the case of Caesarean section and preterm birth
Summary
The profile of sirtuin 3 (SIRT3), 8-hydroxy-2′-deoxyguanosine (8-OHdG), brain-derived neurotrophic factor (BDNF) and serotonin (5-HT) in cord blood and in early breast milk was studied and it was related to perinatal factors. 5-HT and BDNF signalling systems have been claimed to play a critical role in intrauterine development, postnatal adaptation and lactation. The profile of sirtuin 3 (SIRT3), 8-hydroxy-2′-deoxyguanosine (8-OHdG), brain-derived neurotrophic factor (BDNF) and serotonin (5-HT) in cord blood and in early breast milk was studied and it was related to perinatal factors. Our interest in breast milk composition was renewed by current discoveries of the perinatal significance of some bioactive compounds including serotonin [5HT] [11,12,13], brain-derived neurotrophic factor [BDNF] [14,15,16], the histone deacetylase sirtuins [SIRTs] [17, 18] and the oxidative stress marker, 8hydroxy-2′-deoxyquanosine [8-OHdG] [19, 20]
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