Abstract:
:TRH immunological and biological activity was characterized in rat placental extracts. Placentae were extracted sequentially with 2 N acetic acid and glacial acetic acid. The lyophilized residues were further extracted with 90 per cent methanol, and the extracts were then dried, and reextracted with distilled water. When a 100 000 g supernatant fraction of this extract was utilized for characterization, TRH extracted from the placenta was found to be similar to synthetic TRH by four criteria: parallelism of immunoassay inhibition curves, similarity of elution volumes after Sephadex G-10 chromatography, TRH biological activity (TSH release from rat pituitaries in vitro), and identity on high-pressure liquid chromatography. Between the 16th and 20th day of gestation, placental TRH activity increased nearly threefold, from 10.9 +/- 3.0 to 29.7 +/- 3.7 pg/mg protein. Changes of a similar magnitude were apparent in the fetal brain (6.0 +/- 0.5 to 18.9 +/- 2.4 pg/mg protein). Our studies suggest that TRH activity in the rat placenta increases with gestational age in a pattern similar to that described previously for certain placental protein hormones and developmental changes in fetal brain TRH.
journal_name
Placentajournal_title
Placentaauthors
Shambaugh GE 3rd,Kubek M,Wilber JFdoi
10.1016/s0143-4004(83)80036-8subject
Has Abstractpub_date
1983-10-01 00:00:00pages
329-37issue
4eissn
0143-4004issn
1532-3102pii
S0143-4004(83)80036-8journal_volume
4pub_type
杂志文章相关文献
PLACENTA文献大全abstract::The IPL/TSSC3 gene is expressed nearly exclusively from the maternal allele, and its protein product acts to limit placental growth in mice. This protein specifically marks Type II trophoblast in the labyrinthine layer of the mouse placenta. To investigate mouse-human homologies, we carried out immunohistochemistry wi...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/s0143-4004(03)00130-9
更新日期:2003-09-01 00:00:00
abstract::Autophagy is an inducible catabolic process activated during compromised conditions, such as hypoxia. Neonatal encephalopathy (NE) is a syndrome of disturbed neurological function. No absolute prognostic indicators are available at birth to identify neonates at high risk to develop NE. Immunohistochemical staining wit...
journal_title:Placenta
pub_type: 杂志文章,多中心研究
doi:10.1016/j.placenta.2013.09.004
更新日期:2013-11-01 00:00:00
abstract::Intra-uterine growth restriction (IUGR) is defined by a restriction of fetal growth during gestation. It is a prevalent significant public health problem that jeopardizes neonatal health but also that can have deleterious consequences later in adult life. Cullins constitute a family of seven proteins involved in cell ...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2009.11.008
更新日期:2010-02-01 00:00:00
abstract::Several recent publications have focused on the association between the occurrence of twin-to-twin transfusion syndrome (TTTS) in diamniotic-monochorionic twins and the presence of a number of selected anatomic placental characteristics (distribution of vascular territory, cord insertion, type and number of inter-twin...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2004.06.014
更新日期:2005-07-01 00:00:00
abstract::Human placental villi are surfaced by an outer multinucleated syncytiotrophoblast and underlying mononucleated cytotrophoblasts. Conflicting data have attributed one, or the other, of these villous trophoblast phenotypes to undergo enhanced apoptosis in complicated pregnancies, compared to term, normotensive pregnanci...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2012.01.017
更新日期:2012-05-01 00:00:00
abstract::Indiscriminate invasion upon the endometrium by normal trophoblasts is strictly regulated unlike that by choriocarcinoma cells. In this study, we focused on the activity of matrix metalloproteinase (MMP)-2 and MMP-9 as parameters of invasion in normal human placenta. In situ hybridization (ISH), immunohistochemical st...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1053/plac.2002.0867
更新日期:2003-01-01 00:00:00
abstract:INTRODUCTION:Preeclampsia is a severe pregnancy complication mostly due to inadequate vascular dilation and remodeling of spiral arteries. VEGF, the major factor for angiogenesis, is necessary for modulating angiogenic processes in the placenta. Hence reduction of VEGF in gestational hypertension may also lead to hypop...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2016.08.088
更新日期:2016-10-01 00:00:00
abstract::We developed a model of maternal hyperglycaemia with secondary hyperinsulinaemia and hypoaminoacidaemia in pregnant sheep (H) to determine the effect of these conditions on uterine, uteroplacental and fetal amino-acid uptake rates and fetal amino-acid concentrations [AA]. Results were compared with normal pregnant ewe...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1053/plac.2000.0610
更新日期:2001-02-01 00:00:00
abstract:BACKGROUND:The aim of this study was to determine whether DNA-associated micro-particles (MPs) in maternal plasma express fetal-derived human leukocyte antigen-G (HLA-G) or placental alkaline phosphatase (PLAP) and whether the levels differ between women with normotensive pregnancies and preeclampsia. METHODS:DNA-asso...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2009.06.012
更新日期:2009-10-01 00:00:00
abstract::Effects of placental growth factor (PGF), an angiokine product of fetal trophoblasts and maternal decidual cells, on early decidual angiogenesis are undefined. We used whole-mount immunofluorescence analyses to compare uterus and gestation day 4.5-9.5 mouse implantation sites that differed genetically in fetal or mate...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2014.07.006
更新日期:2014-09-01 00:00:00
abstract::The keratin cytoskeleton is present in all trophoblast cell subtypes of the mouse and human placenta and is required to maintain the structural integrity of these cells. Recently, various genetic mouse models have shown that a normal keratin network is necessary for placental development. Keratin-deficiency leads to t...
journal_title:Placenta
pub_type:
doi:10.1016/j.placenta.2007.01.006
更新日期:2007-04-01 00:00:00
abstract::The intrauterine environment has an important influence on placental development. In pre-eclampsia (PE) and intrauterine growth restriction (IUGR), early remodelling of spiral arteries has repercussions for uteroplacental blood flow. The IUGR placenta exhibits compromised growth of villous trees, a smaller intervillou...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2010.04.005
更新日期:2010-07-01 00:00:00
abstract::Decidualization process involves the morphological and functional transformation of endometrial stromal cells into decidual cells. This is a finely regulated process, which involves proliferation and differentiation of stromal cells into decidual cells, which is followed by regression of the decidual tissue, mainly by...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2011.03.007
更新日期:2011-06-01 00:00:00
abstract::The diversity of placental structures in Eutherian mammals is such that drawing generalizations from the definitive forms is problematic. There are always areas of reduced interhaemal distance whether the placenta is epitheliochorial, synepitheliochorial, endotheliochorial or haemochorial. However, the thinning may be...
journal_title:Placenta
pub_type: 杂志文章,评审
doi:10.1016/j.placenta.2004.01.011
更新日期:2004-04-01 00:00:00
abstract::The implantation of the blastocyst and early development of the placenta are crucial for the success of implantation and pregnancy. However, the formative stages of human placental development are largely unknown because of their existence in a 'black box' where access to samples is extremely limited for ethical reaso...
journal_title:Placenta
pub_type: 杂志文章,评审
doi:10.1016/j.placenta.2012.01.020
更新日期:2012-05-01 00:00:00
abstract::Placental protein 5 (PP5)/tissue factor pathway inhibitor-2 (TFPI-2), a serine proteinase inhibitor, is homologous to tissue factor pathway inhibitor (TFPI) and commonly found in peripheral blood of pregnant woman. Although TFPI is well known to be synthesized primarily in endothelium and to play an important role in ...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1053/plac.2001.0774
更新日期:2002-02-01 00:00:00
abstract:INTRODUCTION:Feeding pregnant broodmares with cereal concentrates has been shown to increase maternal insulin resistance and affect foal metabolism in the short and long-term. These effects are likely to be mediated by the placenta. Here, we investigated feto-placental biometry and placental structure and function at t...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2018.02.003
更新日期:2018-04-01 00:00:00
abstract::During early pregnancy, intermediate (extravillous) trophoblast infiltrates the basal plate and invades the spiral arteries, a physiological process required to establish the maternal-fetal circulation. Immunostaining studies have shown that differentiation of trophoblast into this invasive subpopulation is associated...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/s0143-4004(02)90864-7
更新日期:2002-11-01 00:00:00
abstract::In order to assess the characteristics of its stromal cells and the distribution of extracellular matrix proteins, we investigated, immunohistochemically and ultrastructurally, term, first and second trimester human umbilical cords. A differential distribution pattern of the various cytoskeletal proteins of stromal ce...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/s0143-4004(97)90071-0
更新日期:1997-01-01 00:00:00
abstract::The human placenta contains two types of 11beta-hydroxysteroid dehydrogenase (11beta-HSD). The exclusive oxidase 11beta-HSD2 has been suggested to protect the fetus from high levels of maternal glucocorticoids by converting cortisol to inactive cortisone. Perfused term human placenta was used to examine the activity o...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1053/plac.1998.0352
更新日期:1999-01-01 00:00:00
abstract::The effect of a hyposmotic challenge and hence cell-swelling upon the efflux of a variety of solutes from isolated human placental tissue has been examined. A hyposmotic shock increased the fractional release of taurine, the most abundant free amino acid in placental tissue, via a pathway sensitive to niflumic acid, D...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/0143-4004(95)90116-7
更新日期:1995-04-01 00:00:00
abstract::Maternal feed allowance during pregnancy can affect the development of the ovine placenta and fetus. The impact of variations in feed allowance prior to as well as throughout pregnancy has received less attention. Ewes were offered 0.6 (R), 1.2 (C) or 1.8 (AL) maintenance requirements from 89 days before conception un...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2008.02.014
更新日期:2008-06-01 00:00:00
abstract::Parathyroid hormone-related protein (PTHrP), the major factor responsible for hypercalcaemia of malignancy, is widely expressed in normal adult and fetal tissues. In this study, the distribution of PTHrP was examined in human term placenta and membranes by immunohistochemistry using antisera to PTHrP 1-34 and 37-67. P...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/s0143-4004(05)80411-4
更新日期:1994-09-01 00:00:00
abstract::Human placental tissues have been shown to contain gonadotrophin-releasing hormone-(GnRH)-like activity. Thus, the effect of a potent GnRH antagonist (N-Ac-Pro1,D-p-Cl-Phe2,D-Nal(2)3,6-GnRH, obtained from Syntex Laboratories) on placental hormonal release was studied. Explant cultures of placentae of 6 to 15 weeks' ge...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/0143-4004(87)90035-x
更新日期:1987-01-01 00:00:00
abstract:OBJECTIVE:To investigate whether telomere shortening may play a role in senescence of the placenta. STUDY DESIGN:Villous tissue was collected from single, random sites of full-term placentas (39-41 weeks of gestation; n=10) as well as multiple, specific sites of the same placenta (39-41 weeks of gestation; n=5). For t...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2006.04.003
更新日期:2007-04-01 00:00:00
abstract::11β-Hydroxysteroid dehydrogenase 1 and 2 (11β-HSD1 and 11β-HSD2) are involved in the complex mechanism of human parturition. The present study examined mRNA expression and activity of membrane 11β-HSD1 and placental 11β-HSD2 in postdate pregnancies according to response of labor induction. In comparison to postdate wo...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2013.08.011
更新日期:2013-11-01 00:00:00
abstract:INTRODUCTION:Maternal nutrition is an extremely important health issue. We evaluated the impact of maternal high fat diet (HFD) on pregnancy outcomes, elucidated how the rat placenta and fetus respond to diet manipulation based on fetal sex, and identified candidate genes and pathways. METHODS:Rats were fed a normal o...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2019.03.004
更新日期:2019-03-01 00:00:00
abstract::The central role of the placenta in the pathogenesis of pre-eclampsia is undisputed. The evidence that maternal syndrome of pre-eclampsia is caused by a maternal systemic inflammatory response (MSIR) is reviewed. The polymorphic nature of the inflammatory network explains the diversity of the varied signs of this cond...
journal_title:Placenta
pub_type: 杂志文章,评审
doi:10.1053/plac.2002.0930
更新日期:2003-04-01 00:00:00
abstract::Vascularization within the human placenta is the result of the de novo formation of vessels derived from pluripotent precursor cells in the mesenchymal core of the villi. Vascularization of placental villi starts at around day 21 post conception (p.c.) with a four somite embryo. At this stage progenitors of haemangiog...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/j.placenta.2003.11.011
更新日期:2004-07-01 00:00:00
abstract::Several xenobiotic-metabolizing mono-oxygenase activities, in conjunction with the immunohistochemical localization of the respective cytochrome P-450 forms, were investigated in placentae from smoking and non-smoking women. The antibodies used in the immunohistochemical analyses were monoclonal antibodies (MAbs) 1-7-...
journal_title:Placenta
pub_type: 杂志文章
doi:10.1016/0143-4004(88)90034-3
更新日期:1988-05-01 00:00:00