Journal
PLACENTA
Volume 35, Issue 7, Pages 461-466Publisher
W B SAUNDERS CO LTD
DOI: 10.1016/j.placenta.2014.04.007
Keywords
Arterial relaxation; Melatonin; Gestation; Nutrient restriction; Placental blood flow; Sheep
Funding
- Lalor Foundation
- USDA Postdoctoral Fellowship grant from the National Institute of Food and Agriculture [2011-67012-30683]
- NIFA [579322, 2011-67012-30683] Funding Source: Federal RePORTER
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Introduction: Maternal nutrient restriction and decreased scotophase concentrations of melatonin have been associated with severely compromised pregnancies. We hypothesized that melatonin supplementation in a compromised pregnancy enhances the bradykinin (BK)-induced relaxations of placental arteries thereby ensuring sufficient umbilical blood flow to the developing fetus. Methods: Pregnant ewes (n = 31) were fed an adequate (ADQ) or nutrient restricted (RES) diet supplemented with 5 mg of melatonin (MEL) or without melatonin (CON) from day 50 to 130 of gestation. On day 130 of gestation, the maternal (caruncular; CAR) and fetal (cotyledonary; COT) placental arteries were suspended in organ chambers for isometric tension recording. Results: There were no treatment or dietary effects on CAR arteries for any vasoactive agent. However, in COT arteries, MEL ewes were more sensitive (P < 0.01) to bradykinin-induced relaxation than CON ewes. There was a melatonin by nutritional level interaction (P < 0.01) with sodium nitroprusside-induced relaxation of COT arteries where CON-RES were more sensitive to sodium nitroprusside compared to CON-ADQ which was in contrast to when ewes were fed MEL. There was a significant melatonin by nutritional interaction (P = 0.04) for responsiveness to norepinephrine. The sensitivity of the COT arteries to norepinephrine in CON-RES ewes was decreased compared to CON-ADQ Melatonin supplementation, regardless of maternal dietary intake, resulted in COT arteries having similar responsiveness to CON-RES ewes. Conclusion: An increase in placental vessel sensitivity to bradykinin-induced relaxation may contribute to melatonin-induced increases in umbilical artery blood flow. (C) 2014 Elsevier Ltd. All rights reserved.
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