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https://www.readbyqxmd.com/read/28109053/frogs-model-man-in-vivo-thyroid-hormone-signaling-during-development
#1
REVIEW
Laurent M Sachs, Daniel R Buchholz
Thyroid hormone (TH) signaling comprises TH transport across cell membranes, metabolism by deiodinases, and molecular mechanisms of gene regulation. Proper TH signaling is essential for normal perinatal development, most notably for neurogenesis and fetal growth. Knowledge of perinatal TH endocrinology needs improvement to provide better treatments for premature infants and endocrine diseases during gestation and to counteract effects of endocrine disrupting chemicals. Studies in amphibians have provided major insights to understand in-vivo mechanisms of TH signaling...
January 21, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28105960/accuracy-of-prenatal-ultrasound-in-detecting-growth-abnormalities-in-triplets-a-retrospective-cohort-study
#2
Cameron Sklar, Maryna Yaskina, Sue Ross, Kentia Naud
Significant management decisions in triplet pregnancies are made based mainly on ultrasound measurements of fetal growth, although there is a paucity of data examining the accuracy of fetal weight measurements in these gestations. To evaluate accuracy of prenatal ultrasound to diagnose growth abnormalities (intrauterine growth restriction, severe growth discordance) in triplet pregnancies, a retrospective cohort study of 78 triplet pregnancies (234 fetuses) delivered at a single tertiary hospital from January 2004 to May 2015 was performed...
February 2017: Twin Research and Human Genetics: the Official Journal of the International Society for Twin Studies
https://www.readbyqxmd.com/read/28105727/placental-dysfunction-is-associated-with-altered-microrna-expression-in-pregnant-women-with-low-folate-status
#3
Bernadette C Baker, Fiona L Mackie, Samantha C Lean, Susan L Greenwood, Alexander Ep Heazell, Karen Forbes, Rebecca L Jones
SCOPE: Low maternal folate status during pregnancy increases the risk of delivering small for gestational age (SGA) infants, but the mechanistic link between maternal folate status, SGA and placental dysfunction is unknown. microRNAs (miRNA) are altered in pregnancy pathologies and by folate in other systems. We hypothesized low maternal folate status causes placental dysfunction, mediated by altered miRNA expression. METHODS AND RESULTS: A prospective observational study recruited pregnant adolescents, and assessed third trimester folate status and placental function...
January 20, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28104460/fetal-growth-retardation-and-brain-sparing-by-malnutrition-are-associated-to-changes-in-neurotransmitters-profile
#4
C García-Contreras, D Valent, M Vázquez-Gómez, L Arroyo, B Isabel, S Astiz, A Bassols, A Gónzalez-Bulnes
The present study assesses possible changes in the levels of different neurotransmitters (catecholamines and indoleamines) in fetuses affected by nutrient shortage. Hence, we determined the concentration of catecholamines and indoleamines at the hypothalamus of 56 swine fetuses obtained at both 70 and 90days of pregnancy (n=33 and 23 fetuses, respectively). The degree of fetal development and the fetal sex affected the neurotransmitters profile at both stages. At Day 70, there were found higher mean concentrations of l-DOPA in both female and male fetuses with severe IUGR; male fetuses with severe IUGR also showed higher concentrations of TRP than normal male littermates...
January 16, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28103875/effects-of-plasmodium-falciparum-infection-on-umbilical-artery-resistance-and-intrafetal-blood-flow-distribution-a-doppler-ultrasound-study-from-papua-new-guinea
#5
Maria Ome-Kaius, Stephan Karl, Regina Alice Wangnapi, John Walpe Bolnga, Glen Mola, Jane Walker, Ivo Mueller, Holger Werner Unger, Stephen John Rogerson
BACKGROUND: Doppler velocimetry studies of umbilical artery (UA) and middle cerebral artery (MCA) flow help to determine the presence and severity of fetal growth restriction. Increased UA resistance and reduced MCA pulsatility may indicate increased placental resistance and intrafetal blood flow redistribution. Malaria causes low birth weight and fetal growth restriction, but few studies have assessed its effects on uteroplacental and fetoplacental blood flow. METHODS: Colour-pulsed Doppler ultrasound was used to assess UA and MCA flow in 396 Papua New Guinean singleton fetuses...
January 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28100391/-a-review-of-progress-in-research-of-effect-of-air-pollutants-on-fetal-growth
#6
W Y Wang, R X Zhao, H Guo, S Chen, W H Zhang, S L Yang, K Wang, Y Meng, J Huang, S Wei
Slow fetal growth is a global public health concern because it might be associated with many diseases later in life. With the progress of technology to measure long-term air pollution exposure. Many epidemiological studies have evaluated the effects of maternal air pollutant exposure on fetal growth. In this paper, we summarize the research progress in this field after the analysis on the related literatures retrieved from the databases of Medline and Web of Science.
10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28099426/fetal-origins-of-adult-cardiac-disease-a-novel-approach-to-prevent-fetal-growth-restriction-induced-cardiac-dysfunction-using-insulin-like-growth-factor
#7
Tarek Alsaied, Khaled Omar, Jeanne F James, Robert B Hinton, Timothy M Crombleholme, Mounira Habli
BACKGROUND: Fetal growth restriction is a risk factor for adult cardiovascular disease. Intra-placental gene transfer of human insulin-like growth factor-1 corrects birth weight in our mouse model of fetal growth restriction. This study addresses long term effects of fetal growth restriction on cardiac function and the potential preventive effect of insulin-like growth factor-1. STUDY DESIGN: Laparotomy was performed on pregnant C57BL/6J mice at embryonic day 18 and pups were divided into 3 groups: Sham operated; fetal growth restriction (induced by mesenteric uterine artery ligation); treatment (intra-placental injection of insulin-like growth factor-1 after uterine artery ligation)...
January 18, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28094005/imprinted-genes-and-the-regulation-of-placental-endocrine-function-pregnancy-and-beyond
#8
Rosalind M John
Genomic imprinting is an epigenetic process responsible for the monoallelic expression of a subset of genes in mammals. Imprinted genes have been demonstrated to play important functions prenatally regulating fetal growth and placental development with some functions persisting beyond pregnancy to influence both metabolism and behaviour in adults. This review focuses on the function of imprinted genes in regulating placental hormones, and the probability that these functions manifest their impact beyond pregnancy...
January 10, 2017: Placenta
https://www.readbyqxmd.com/read/28093414/fetal-growth-restriction-and-long-term-cardiovascular-risk-is-it-time-to-get-with-the-program
#9
EDITORIAL
David M Harrild, Gerald R Marx
No abstract text is available yet for this article.
January 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28093413/persistence-of-cardiac-remodeling-in-preadolescents-with-fetal-growth-restriction
#10
Sebastian Imre Sarvari, Merida Rodriguez-Lopez, Marta Nuñez-Garcia, Marta Sitges, Alvaro Sepulveda-Martinez, Oscar Camara, Constantine Butakoff, Eduard Gratacos, Bart Bijnens, Fatima Crispi
BACKGROUND: Fetal growth restriction (FGR) affects 5% to 10% of newborns and is associated with increased cardiovascular mortality in adulthood. We evaluated whether prenatal cardiovascular changes previously demonstrated in FGR persist into preadolescence. METHODS AND RESULTS: A cohort study of 58 FGR (defined as birth weight below 10th centile) and 94 normally grown fetuses identified in utero and followed-up into preadolescence (8-12 years of age) by echocardiography and 3-dimensional shape computational analysis...
January 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28090634/dietary-interventions-for-fetal-growth-restriction-therapeutic-potential-of-dietary-nitrate-supplementation-in-pregnancy
#11
Elizabeth Cottrell, Teresa Tropea, Laura Ormesher, Susan Greenwood, Mark Wareing, Edward Johnstone, Jenny Myers, Colin Sibley
Fetal growth restriction (FGR) affects around 5% of pregnancies and is associated with significant short- and long-term adverse outcomes. A number of factors can increase the risk of FGR, one of which is poor maternal diet. In terms of pathology, both clinically and in many experimental models of FGR, impaired uteroplacental vascular function is implicated, leading to a reduction in the delivery of oxygen and nutrients to the developing fetus. Whilst mechanisms underpinning impaired uteroplacental vascular function are not fully understood, interventions aimed at enhancing nitric oxide (NO) bioavailability remain a key area of interest in obstetric research...
January 16, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28089504/review-nutrient-sulfate-supply-from-mother-to-fetus-placental-adaptive-responses-during-human-and-animal-gestation
#12
REVIEW
P A Dawson, K Richard, A Perkins, Z Zhang, D G Simmons
Nutrient sulfate has numerous roles in mammalian physiology and is essential for healthy fetal growth and development. The fetus has limited capacity to generate sulfate and relies on sulfate supplied from the maternal circulation via placental sulfate transporters. The placenta also has a high sulfate requirement for numerous molecular and cellular functions, including sulfate conjugation (sulfonation) to estrogen and thyroid hormone which leads to their inactivation. Accordingly, the ratio of sulfonated (inactive) to unconjugated (active) hormones modulates endocrine function in fetal, placental and maternal tissues...
January 4, 2017: Placenta
https://www.readbyqxmd.com/read/28087423/is-middle-cerebral-artery-doppler-related-to-neonatal-and-2-year-infant-outcome-in-early-fetal-growth-restriction
#13
Tamara Stampalija, Birgit Arabin, Hans Wolf, Caterina M Bilardo, Christoph Lees
BACKGROUND: Reduced fetal middle cerebral artery Doppler impedance is associated with hypoxemia in fetal growth restriction. It remains unclear as to whether this finding could be useful in timing delivery especially in third trimester. In this regard there is a paucity of evidence from prospective studies. OBJECTIVES: The aim of this study was to determine whether there is an association between middle cerebral artery Doppler impedance and its ratio with the umbilical artery in relation to neonatal and 2-year infant outcome in early fetal growth restriction (26(+0)-31(+6) weeks of gestation)...
January 10, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28087122/human-trophoblast-stem-cells-real-or-not-real
#14
Ching-Wen Chang, Mana M Parast
Abnormal trophoblast differentiation is the root cause of many placenta-based pregnancy complications, including preeclampsia and fetal growth restriction. Human trophoblast differentiation is difficult to study due to the lack of a stem cell model. Such a multipotent "trophoblast stem" (TS) cell, with the ability to differentiate into all trophoblast subtypes, has been derived from mouse blastocysts, but attempts to derive similar human cells have failed. We consider here several possibilities for the TS cell niche in the human placenta...
January 5, 2017: Placenta
https://www.readbyqxmd.com/read/28079409/promoting-awareness-of-neonatal-menstruation
#15
Paola Bianchi, Giuseppe Benagiano, Ivo Brosens
Neonatal uterine bleeding (NUB) has been carefully studied in the past through case reports, small series, clinical cohort studies, pathology investigations of fetal and neonatal. Following a historical recount, this review summarizes biological mechanisms conditioning NUB, starting from the persistence till birth of an 'ontogenetic progesterone resistance' (OPR), causing decreased responsiveness of target tissues to bioavailable progesterone. Several pregnancy-related conditions, such as preeclampsia, fetal growth restriction, prematurity, post-maturity and even Rhesus or ABO incompatibility, influence the occurrence of NUB...
January 12, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28077924/temperature-during-pregnancy-influences-the-fetal-growth-and-birth-size
#16
Harunor Rashid, Miki Kagami, Farzana Ferdous, Enbo Ma, Toru Terao, Taiichi Hayashi, Yukiko Wagatsuma
BACKGROUND: Birth weight and length have seasonal fluctuations. However, it is uncertain which meteorological element has an effect on birth outcomes and which timing of pregnancy would explain such effect. Therefore, the purpose of this study was to examine temperature effects during pregnancy and which timing of pregnancy has effects on size at birth. METHODS: A large, randomized, controlled trial of food and micronutrient supplementation for pregnant women was conducted in Matlab, Bangladesh (MINIMat Study), where women were enrolled from November 2001 to October 2003...
2017: Tropical Medicine and Health
https://www.readbyqxmd.com/read/28075545/fetal-growth-and-parental-cardiovascular-risk-preterm-birth-matters
#17
Janet M Catov
It is now well established, but poorly understood, that preterm birth marks excess cardiovascular risk among mothers. The study by Morken et al. provides new and important insights into these links by integrating preterm birth and fetal growth abnormalities as metrics of long-term parental CVD mortality risk. They report that small and large infants delivered preterm are linked to excess maternal CVD risk, but these features are only weakly associated with paternal CVD. This article is protected by copyright...
January 11, 2017: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28075368/critical-windows-of-prenatal-exposure-to-cadmium-and-size-at-birth
#18
Lu Cheng, Bin Zhang, Tongzhang Zheng, Jie Hu, Aifen Zhou, Bryan A Bassig, Wei Xia, David A Savitz, Stephen Buka, Chao Xiong, Joseph M Braun, Yaqi Zhang, Yanqiu Zhou, Xinyun Pan, Chuansha Wu, Youjie Wang, Zhengmin Qian, Aimin Yang, Megan E Romano, Kunchong Shi, Shunqing Xu, Yuanyuan Li
Prenatal cadmium (Cd) exposure has been associated with adverse birth outcomes, but the findings of previous studies are inconsistent. We measured Cd concentrations in urine samples at or near 13, 24, and 35 gestational weeks from 282 women in Wuhan, China. We used generalized estimating equation models to assess the associations between maternal creatinine adjusted urinary Cd concentrations at each trimester and birth size. A significant inverse association was observed between higher maternal Cd levels measured during the 1st trimester and birth size in girls...
January 9, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28072479/reference-values-for-sonographically-estimated-fetal-weight-in-twin-gestations-stratified-by-chorionicity-a-single-center-study
#19
Rinat Gabbay-Benziv, Sarah Crimmins, Stephen A Contag
OBJECTIVES: To determine reference values for sonography-based estimated fetal weight (EFW) in twin gestations in one single tertiary medical center in the United States. METHODS: A retrospective longitudinal analysis of EFW evaluations of fetuses of twin gestations between November 2006 and June 2016. Fetuses with major congenital anomalies or chromosomal abnormalities were excluded. Estimated fetal weight was calculated using the Hadlock 1985 formula. Linear mixed models were used to allow for multiple but inconsistent observations among individuals, and to account for intertwin differences as well as for gender...
January 10, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28069900/impact-of-donor-and-recipient-adiposity-on-feto-placental-growth-in-adolescent-sheep
#20
Jacqueline M Wallace, John S Milne, Clare L Adam, Raymond P Aitken
The influence of maternal obesity during oocyte development and its putative interaction with nutrient reserves at conception on pregnancy outcome were examined in an adolescent sheep model. Donor ewes were nutritionally managed to achieve contrasting adiposity (control [CD]/obese [ObD]) for 6 weeks prior to superovulation, and inseminated by a non-obese sire. Morulae from 6 CD and 7 ObD were transferred in singleton into adolescent recipients of identical age but differing adiposity, classified as relatively fat or thin, respectively...
January 9, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
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