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Maternal melatonin is a selective regulator of fetal and neonatal cortisol.
2004 APR 1 - (NewsRx.com & NewsRx.net) -- Maternal melatonin is a selective regulator of fetal and neonatal cortisol.
According to researchers in Chile, "we tested the hypothesis that in primates, maternal melatonin restrains fetal and newborn adrenal cortisol production. A functional G-protein-coupled MT1 membrane-bound melatonin receptor was detected in 90% gestation capuchin monkey fetal adrenals by (a) 2-[[superscript]125I] iodomelatonin binding (K-d, 75.7[+ or -]6.9 pm; B-max, 2.6[+ or -]0.4 fmol (mg protein)[superscript]-1), (b) cDNA identification, and (c) melatonin inhibition of adrenocorticotrophic hormone (ACTH)- and corticotrophin-releasing hormone (CRH)-stimulated cortisol but not of dehydroepiandrosterone sulphate (DHAS) production in vitro."
"Melatonin also inhibited ACTH-induced 3beta-hydroxysteroid dehydrogenase mRNA expression. To assess the physiological relevance of these findings, we next studied the effect of chronic maternal melatonin suppression (induced by exposure to constant light during the last third of gestation) on maternal plasma estradiol during gestation and on plasma cortisol concentration in the 4- to 6-day-old newborn," reported C. Torres-Farfan and colleagues, Pontifical Catholic University of Chile, Faculty of Biological Sciences.
"Constant light suppressed maternal melatonin without affecting maternal plasma ...
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