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Fetal lung maturation

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https://www.readbyqxmd.com/read/29138038/low-dose-betamethasone-acetate-for-fetal-lung-maturation-in-preterm-sheep
#1
Augusto F Schmidt, Matthew W Kemp, Judith Rittenschober-Böhm, Paranthaman S Kannan, Haruo Usuda, Masatoshi Saito, Lucy Furfaro, Shimpei Watanabe, Sarah Stock, Boris W Kramer, John P Newnham, Suhas G Kallapur, Alan H Jobe
BACKGROUND: Antenatal steroids (ANS) are standard of care for women at risk of preterm delivery; however ANS dosing and formulation have not been adequately evaluated. The standard clinical 2-dose treatment with betamethasone-acetate+betamethasone-phosphate (Beta-P+Beta-Ac) is more effective than 2 doses of Beta-P for inducing lung maturation in preterm fetal sheep. We hypothesized that the slowly-released Beta-Ac component induces similar lung maturation to Beta-P+Beta-Ac with decreased dose and fetal exposure...
November 11, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29138031/mortality-and-pulmonary-outcomes-of-extremely-preterm-infants-exposed-to-antenatal-corticosteroids
#2
Colm P Travers, Waldemar A Carlo, Scott A Mcdonald, Abhik Das, Edward F Bell, Namasivayam Ambalavanan, Alan H Jobe, Ronald N Goldberg, Carl T D'Angio, Barbara J Stoll, Seetha Shankaran, Abbot R Laptook, Barbara Schmidt, Michele C Walsh, Pablo J Sanchez, M Bethany Ball, Ellen C Hale, Nancy S Newman, Rosemary D Higgins
BACKGROUND: Antenatal corticosteroids are given primarily to induce fetal lung maturation but results from meta-analyses of randomized controlled trials have not shown mortality or pulmonary benefits for extremely preterm infants although these are the infants most at risk of mortality and pulmonary disease. OBJECTIVE: To determine if exposure to antenatal corticosteroids is associated with a lower rate of death and pulmonary morbidities by 36 weeks' postmenstrual age...
November 11, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29126797/the-cytokine-tgf-%C3%AE-promotes-the-development-and-homeostasis-of-alveolar-macrophages
#3
Xueyang Yu, Anne Buttgereit, Iva Lelios, Sebastian G Utz, Dilay Cansever, Burkhard Becher, Melanie Greter
Alveolar macrophages (AMs) derive from fetal liver monocytes, which colonize the lung during embryonic development and give rise to fully mature AMs perinatally. AM differentiation requires granulocyte macrophage colony-stimulating factor (GM-CSF), but whether additional factors are involved in AM regulation is not known. Here we report that AMs, in contrast to most other tissue macrophages, were also dependent on transforming growth factor-β receptor (TGF-βR) signaling. Conditional deletion of TGF-βR in mice at different time points halted the development and differentiation of AMs...
November 6, 2017: Immunity
https://www.readbyqxmd.com/read/29104474/association-of-surfactant-protein-with-expression-of-hoxa5-and-hoxb5-in-rabbit-fetal-lung
#4
Sung-Hoon Chung, Chong-Woo Bae
Hox genes regulate organ formation and identity of the embryo, and expressed in specific temporo-spatial patterns in the developing embryo. We compared the expression levels of the Hoxa5, Hoxb5, surfactant protein (SP)-A, and SP-B genes in immature and mature rabbit fetal lung tissues, and to uncover roles for Hoxa5, Hoxb5, SP-A, and SP-B. Cesarean sections were performed after rabbits were divided into two groups of 30-31 days of gestation (term group, n = 24) and 26-27 days of gestation (preterm group, n = 24)...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/29079144/society-for-maternal-fetal-medicine-smfm-consult-series-44-management-of-bleeding-in%C3%A2-the-late-preterm-period
#5
Cynthia Gyamfi-Bannerman
Third-trimester bleeding is a common complication arising from a variety of etiologies, some of which may initially present in the late preterm period. Previous management recommendations have not been specific to this gestational age window, which carries a potentially lower threshold for delivery. The purpose of this document is to provide guidance on management of late preterm (34 0/7-36 6/7 weeks of gestation) vaginal bleeding. The following are Society for Maternal-Fetal Medicine recommendations: (1) we recommend delivery at 36-37 6/7 weeks of gestation for stable women with placenta previa without bleeding or other obstetric complications, such as preeclampsia or fetal growth restriction (Grade 1B); (2) we do not recommend routine cervical length screening for women with placenta previa in the late preterm period because of a lack of data on an appropriate management strategy (Grade 2C); (3) we recommend a planned delivery between 34 and 37 weeks of gestation for stable women with placenta accreta (Grade 1C); (4) we recommend delivery between 34 and 37 weeks of gestation for stable women with vasa previa (Grade 1C); (5) we recommend that in women with active hemorrhage in the late preterm period, delivery should not be delayed for the purpose of administering antenatal corticosteroids (Grade 1B); (6) we recommend that fetal lung maturity testing should not be used to guide management in the late preterm period when an indication for delivery is present (Grade 1B); and (7) we recommend that antenatal corticosteroids should be administered to women who are eligible and are managed expectantly if delivery is likely within 7 days, the gestational age is between 34 0/7 and 36 6/7 weeks of gestation, and antenatal corticosteroids has not previously been administered (Grade 1A)...
October 25, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29028158/effects-of-intratracheal-budesonide-during-early-postnatal-life-on-lung-maturity-of-premature-fetal-rabbits
#6
Ling Li, Chen Yang, Xiuliang Feng, Yongping Du, Zhihong Zhang, Yueping Zhang
AIM: This study aimed to study the effects of intratracheal instillation of budesonide on lung maturity of premature fetal rabbits. The developmental pattern of pulmonary alveoli in rabbits is similar to that in humans. METHOD: Fetal rabbits were taken out from female rabbits on the 28th day of pregnancy (full term = 31 days) by cesarean section (c-section). The fetal rabbits were divided into four groups: control (normal saline, NS), budesonide (budesonide, BUD), calf pulmonary surfactant for injection (pulmonary surfactant, PS), and calf pulmonary surfactant + budesonide for injection (pulmonary surfactant + budesonide, PS + BUD)...
October 13, 2017: Pediatric Pulmonology
https://www.readbyqxmd.com/read/29022513/discrepancies-in-animal-models-of-preterm-birth
#7
Clarence R Manuel, Charles R Ashby, Sandra E Reznik
BACKGROUND: Preterm birth (PTB) is a multifactorial syndrome occurring before the 37th week of full-term pregnancy [1]. Babies delivered preterm experience short-term and long-term complications affecting multiple organ systems, and serious maternal complications include hemorrhage and infection. Each year, an estimated 15 million babies are born preterm, and complications from prematurity are the leading cause of death among children up to 5 years of age [2]. With another increase in PTB rates over the last several years, the United States continues to have the highest incidence of any industrialized country [3]...
October 12, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29018962/the-fetal-lung-to-liver-signal-intensity-ratio-on-magnetic-resonance-imaging-as-a-predictor-of-outcomes-from-isolated-congenital-diaphragmatic-hernia
#8
Masaya Yamoto, Teruo Iwazaki, Kasumi Takeuchi, Kyouhei Sano, Koji Fukumoto, Toshiaki Takahashi, Akiyoshi Nomura, Kei Ooyama, Akinori Sekioka, Yutaka Yamada, Naoto Urushihara
PURPOSE: We investigated the developmental changes in the unaffected contralateral lungs of patients with isolated left-sided congenital diaphragmatic hernia (CDH) using signal intensity ratios on prenatal magnetic resonance imaging (MRI) and determined whether these changes correlated with clinical outcomes. METHODS: We performed 47 fetal MRI screens on 30 patients with isolated left-sided CDH. A cohort of 88 fetuses was selected as the control. We calculated the lung-to-liver signal intensity ratio (LLSIR) using region of interest analysis and compared LLSIR between the groups and between those in the CDH group with good and poor prognoses...
October 10, 2017: Pediatric Surgery International
https://www.readbyqxmd.com/read/28958716/evaluation-of-alveolar-epithelial-cells-in-the-sheep-model-of-congenital-diaphragmatic-hernia-type-1-alveolar-epithelial-cells-and-histopathological-image-analysis
#9
Juma Obayashi, Kohei Kawaguchi, Junki Koike, Kunihide Tanaka, Yasuji Seki, Hideki Nagae, Shutaro Manabe, Kei Ohyama, Masayuki Takagi, Hiroaki Kitagawa, Kevin C Pringle
BACKGROUND: There are few reports comparing type 1 alveolar epithelial cell development with histopathological image analysis. We investigated these as indicators of maturity in fetal lambs' lungs in a congenital diaphragmatic hernia (CDH) model. METHODS: We created left CDH in 4 fetal lambs at 75 or 76days' gestation (Group A). Controls were 5 sham-operated lambs (Group B); both groups delivered at term. The right lower lung lobe (RLL) and left lower lobe (LLL) were sampled...
September 4, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28950169/lipidomics-of-equine-amniotic-fluid-identification-of-amphiphilic-o-acyl-%C3%AF-hydroxy-fatty-acids
#10
Paul L Wood, Barry A Ball, Kirsten Scoggin, Mats H Troedsson, Edward L Squires
Amniotic fluid is essential for the growth and maturation of the fetus prior to parturition. While our knowledge of human amniotic fluid is extensive, current data for equine amniotic fluid is limited. We therefore undertook a detailed lipidomics analysis of equine amniotic fluid. Using a non-targeted high-resolution mass spectrometric lipidomics analysis of equine amniotic fluid, we were able to characterize a diverse array of individual lipids. This non-biased analytical approach detected, for the first time, the presence of (O-acyl)-ω-hydroxy-fatty acids (OAHFA) with up to 52 carbon chain lengths in amniotic fluid...
January 1, 2018: Theriogenology
https://www.readbyqxmd.com/read/28949968/normalisation-of-surfactant-protein-a-and-b-expression-in-the-lungs-of-low-birth-weight-lambs-by-21-days-old
#11
Jia Yin Soo, Sandra Orgeig, Erin Victoria McGillick, Song Zhang, I Caroline McMillen, Janna L Morrison
Intrauterine growth restriction (IUGR) induced by placental restriction (PR) in the sheep negatively impacts lung and pulmonary surfactant development during fetal life. Using a sheep model of low birth weight (LBW), we found that there was an increase in mRNA expression of surfactant protein (SP)-A, -B and -C in the lung of LBW lambs but no difference in the protein expression of SP-A or -B. LBW also resulted in increased lysosome-associated membrane glycoprotein (LAMP)-3 mRNA expression, which may indicate an increase in either the density of type II Alveolar epithelial cells (AEC) or maturity of type II AECs...
2017: PloS One
https://www.readbyqxmd.com/read/28926341/maternal-plasma-lpcat-1-mrna-correlates-with-lamellar-body-count
#12
Robert A Welch, Maurice-Andre Recanati, Kathryn C Welch, Michael K Shaw
Human lysophosphatidylcholine acyltransferase 1 (hLPCAT1) is a protein which helps produce surfactant in the fetal lung. We previously reported that levels of cell-free fetal mRNA for hLPCAT1 in amniotic fluid are correlated with lamellar body count (LBC) (r2=0.93). This short communication demonstrates that fetal hLPCAT1 mRNA is also present in maternal blood. Its quantity also correlates with amniotic fluid LBC (r2=0.81). Research in maternal plasma hLPCAT1 may assist in understanding fetal and placental maturational processes...
September 19, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28902364/functional-roles-of-c-ebp%C3%AE-and-sumo%C3%A2-modification-in-lung-development
#13
Yuan-Dong Chen, Jiang-Yan Liu, Yan-Min Lu, Hai-Tao Zhu, Wei Tang, Qiu-Xia Wang, Hong-Yan Lu
CCAAT enhancer binding protein alpha (C/EBPα) is a transcription factor regulating the core aspects of cell growth and differentiation. The present study investigated the level and functional role of C/EBPα during the development of the rat lung. C/EBPα protein exhibits a dynamic expression pattern. The correlation between the expression of C/EBPα protein and the content of glycogen during lung maturation was analyzed to understand the function of C/EBPα in lung differentiation. The high expression of C/EBPα coincides with the reduction of glycogen in the fetal lung...
October 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28860525/glucocorticoids-are-lower-at-delivery-in-maternal-but-not-cord-blood-of-obese-pregnancies
#14
Laura I Stirrat, George Just, Natalie Z M Homer, Ruth Andrew, Jane E Norman, Rebecca M Reynolds
Glucocorticoids are vital for lung maturation. We previously showed that cortisol is lower in obese pregnancy. Whether this is maintained at delivery is unknown but is clinically relevant as maternal and cord blood cortisol levels are correlated and offspring of obese are more likely to need neonatal respiratory support. We hypothesized that glucocorticoids are lower in maternal and cord blood at delivery in obese pregnancies. Glucocorticoids (cortisol and corticosterone) and their inactive versions (cortisone and 11-dehydrocorticosterone) were measured by LC-MS/MS in maternal and cord plasma from 259 Caucasian women at delivery (BMI 18-55 kg/m(2))...
August 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28858117/exacerbation-of-primary-intestinal-lymphangiectasia-during-late-pregnancy-and-recovery-after-delivery-a-case-report-and-literature-review
#15
REVIEW
Jianyang Lu, Hongbo Zhai
RATIONALE: Primary intestinal lymphangiectasia (PIL) is a rare disease characterized by dilated intestinal lacteals resulting in lymph leakage into the small bowel lumen. Main clinical features include intermittent diarrhea, hypoproteinemia. Scattered case reports suggested that PIL is compatible to pregnancy, but with increased complications. PATIENT CONCERNS: A 34-year-old woman with endoscopically diagnosed PIL presented to antenatal our clinic at 10 weeks into gestation...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28836410/effect-of-fetal-mouse-lung-tissue-co-culture-on-in-vitro-maturation-of-mouse-immature-oocytes
#16
Masomeh Belbasi, Seyed Gholam Ali Jorsaraei, Maryam Gholamitabar Tabari, Ramzan Khanbabaei
OBJECTIVES: The aim of this study was to evaluate the fetal mouse lung tissue co-culture on in vitro maturation (IVM) of mouse immature oocytes. MATERIALS AND METHODS: In this experimental study, germinal vesicle (GV) oocytes from ovaries of a group of 25 female mice, 6-8 weeks of age, were dissected after being stimulated by 7.5 IU pregnant mare serum gonadotropin (PMSG) through an intraperitoneal (IP) injection. The fetal lung tissues were then prepared and cultured individually...
October 2017: Cell Journal
https://www.readbyqxmd.com/read/28833496/expression-of-nestin-in-embryonic-tissues-and-its-effects-on-clinicopathological-characteristics-of-patients-with-placenta-previa
#17
Yan-Yan Qiao, Ping Chu
In this study, we examined expression of nestin in the spinal cord, lung, kidney, stomach, colon and intestine tissues at different stages of embryos in patients with placenta previa. Fetuses of 75 patients with placenta previa were assigned to case group and 80 fetuses from healthy pregnant women with normal placenta who voluntarily terminated pregnancy to control group. Clinical data of pregnant women were collected at the time of admission. Blood from elbow vein was collected to determine expression of serum nestin...
August 18, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28827121/a-scid-mouse-human-lung-xenograft-model-of-varicella-zoster-virus-infection
#18
Wei Wang, Dequan Pan, Wenkun Fu, Linli Cai, Jianghui Ye, Jian Liu, Che Liu, Xiumin Huang, Yanzhen Lin, Ningshao Xia, Tong Cheng, Hua Zhu
Varicella pneumonia is one of the most serious, potentially life-threatening complications of primary varicella-zoster virus (VZV) infection in adults and immunocompromised individuals. However, studies on the lung pathogenesis of VZV infection as well as development and testing of antivirals have long been hindered by limited access to clinical samples and a lack of suitable animal models. In this study, we report for the first time the use of human lung xenografts in SCID mice for investigating VZV infection...
August 18, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28759122/differential-effects-of-late-gestation-maternal-overnutrition-on-the-regulation-of-surfactant-maturation-in-fetal-and-postnatal-life
#19
Mitchell C Lock, Erin V McGillick, Sandra Orgeig, I Caroline McMillen, Beverly S Mühlhäusler, Song Zhang, Janna L Morrison
KEY POINTS: Offspring of overweight and obese women are at greater risk for respiratory complications at birth. We determined the effect of late gestation maternal overnutrition (LGON) in sheep on surfactant maturation, glucose transport and fatty acid metabolism in the lung in fetal and postnatal life. There were significant decreases in surfactant components and numerical density of surfactant producing cells in the alveolar epithelium due to LGON in the fetal lung. However, there were no differences in the levels of these surfactant components between control and LGON lambs at 30 days of age...
November 1, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28735176/reduced-short-term-variation-following-antenatal-administration-of-betamethasone-is-reduced-fetal-size-a-predisposing-factor
#20
Tullio Ghi, Andrea Dall'Asta, Gabriele Saccone, Federica Bellussi, Tiziana Frusca, Pasquale Martinelli, Gianluigi Pilu, Nicola Rizzo
OBJECTIVE: To assess the association between fetal size and the incidence of reduced short-term variability (STV) following bethametasone administration for fetal lung maturity. STUDY DESIGN: This was a retrospective, multicenter, cohort study conducted in two Tertiary University Units. Only uncomplicated singleton pregnancies admitted for threatened preterm labor between 26 and 34 weeks and submitted to betamethasone for fetal lung maturity were included. Delivery occurring within 72h from betamethasone administration represented criteria for exclusion...
September 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
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