Local vaginal bioelectrical impedance can predict preterm delivery in mice.

Preterm birth is a serious pregnancy complication that affects neonatal mortality, morbidity, and long-term neurological prognosis. Predicting spontaneous preterm delivery (PTD) is important for its management. While excluding the risk of PTD is important, identifying women at high risk of PTD is imperative for medical intervention.

Endotheliochorial placental glycosylation reflects evolutionary divergence between Felidae species (Felis catus and Panthera leo) and Canidae (Canisfamiliaris).

Endotheliochorial cat (Felis catus) and lion (Panthera leo) term placentae and one 6 week placenta (term 60-63 days) from a dog (Canis familiaris) were stained with a panel of 24 lectins to compare glycosylation at the feto-maternal interface. Glycan expression in lion and cat placentae was very similar apart from the occurrence of terminal α-galactose in the lion trophoblast. The dog differed in several respects, particularly in the trophoblast, consistent with species-specific glycotypes differing according to the degree of their evolutionary divergence.

Lectin histochemistry reveals two cytotrophoblast differentiation pathways during placental development in the feline (Feliscatus).

Introduction: Placental glycosylation has been examined on eight feline placentae ranging from approximately 15 to 60 days post-conception as little is known about changes in glycan distribution in this species.

Methods: Specimens were resin embedded and lectin histochemistry was applied to semi-thin sections using a panel of 24 lectins and an avidin-biotin revealing system.

Results: Abundant tri-tetraantennary complex N-glycan and α-galactosyl residues found in the syncytium in early pregnancy were greatly reduced in mid-pregnancy, though retained at the invasion front in the syncytium (N-glycan) or cytotrophoblast layer (αGal).

Perturbation of placental protein glycosylation by endoplasmic reticulum stress promotes maladaptation of maternal hepatic glucose metabolism.

Placental hormones orchestrate maternal metabolic adaptations to support pregnancy. We hypothesized that placental ER stress, which characterizes early-onset pre-eclampsia (ePE), compromises glycosylation, reducing hormone bioactivity and these maladaptations predispose the mother to metabolic disease in later life. We demonstrate ER stress reduces the complexity and sialylation of trophoblast protein N-glycosylation, while aberrant glycosylation of vascular endothelial growth factor reduced its bioactivity.

Observations on the glycosylation of the term placenta of the Indo-Pacific Bottlenose Dolphin (Tursiops aduncus): A lectin histochemical study.

Introduction: Little is known about the glycosylation of placental villi and areolae of cetaceans. Term tissue from the delivered placenta of an Indo-Pacific Bottlenose Dolphin (Tursiops aduncus) was examined using lectin histochemistry to compare trophoblast glycosylation in these two locations.

Methods: Placental blocks fixed in 10% formalin were resin-embedded before semithin sections were stained with 24 biotinylated lectins and an avidin-biotin revealing system.

Morphological and functional changes in placentas from prolonged pregnancies.

Prolonged pregnancy describes a pregnancy that progresses beyond 42 weeks' gestation (294 days). In humans, prolonged pregnancy is associated with increasing perinatal mortality, neonatal compromise and birth by Caesarean section. The underpinning reasons behind these increased risks are unknown; one potential explanation is reduced placental function due to ageing processes.

A re-examination of the origins of placental bed giant cells.

In view of controversy about the source of placental multinuclear giant cells, we have re-examined the literature which clearly shows they are derived from trophoblastic elements that have populated the decidua. Archival material for electron microscopy from 17 to 18 week placentae demonstrates they can be found connected via desmosomes to the outer extravillous cytotrophoblast cells of anchoring columns, thus identifying a primary source. We suggest their formation is a terminal differentiation step occurring at all stages of invasion from the cell column to the myometrium, progressively reducing the invasive population.

Increased Placental Cell Senescence and Oxidative Stress in Women with Pre-Eclampsia and Normotensive Post-Term Pregnancies.

Up to 11% of pregnancies extend to post-term with adverse obstetric events linked to pregnancies over 42 weeks. Oxidative stress and senescence (cells stop growing and dividing by irreversibly arresting their cell cycle and gradually ageing) can result in diminished cell function. There are no detailed studies of placental cell senescence markers across a range of gestational ages, although increased levels have been linked to pre-eclampsia before full term.

Menstrual flow as a non-invasive source of endometrial organoids.

Assessment of the endometrium often necessitates a biopsy, which currently involves an invasive, transcervical procedure. Here, we present an alternative technique based on deriving organoids from menstrual flow. We demonstrate that organoids can be derived from gland fragments recovered from menstrual flow.

Cell dynamics in human villous trophoblast.

Background: Villous cytotrophoblast (vCTB) is a precursor cell population that supports the development of syncytiotrophoblast (vSTB), the high surface area barrier epithelium of the placental villus, and the primary interface between maternal and fetal tissue. In light of increasing evidence that the placenta can adapt to changing maternal environments or, under stress, can trigger maternal disease, we consider what properties of these cells empower them to exert a controlling influence on pregnancy progression and outcome.

Objective And Rationale: How are cytotrophoblast proliferation and differentiation regulated in the human placental villus to allow for the increasing demands of the fetal and environmental challenges and stresses that may arise during pregnancy?

Search Methods: PubMed was interrogated using relevant keywords and word roots combining trophoblast, villus/villous, syncytio/syncytium, placenta, stem, transcription factor (and the individual genes), signalling, apoptosis, autophagy (and the respective genes) from 1960 to the present.

Evidence for the presence of air pollution nanoparticles in placental tissue cells.

Inhaled particulate matter (PM) from combustion- and friction-sourced air pollution adversely affects organs distant from the lung. A putative mechanism for the remote effect of inhaled PM is that ultrafine, nano-sized fraction (<100 nm) translocates across the air-tissue barrier, directly interacting with phagocytic tissue cells. Although PM is reported in other tissues, whether it is phagocytosed by non-respiratory tissue resident cells is unclear.

A preliminary study on the glycosylation of the reproductive tract in the Ostrich (Struthio camelus camelus).

Glycosylation of the reproductive tract of an adult female red-necked ostrich (Struthio camelus camelus) carrying a fully formed calcified egg in her uterus when accidently killed by a blow to the head was examined using lectin histochemistry on samples from the infundibulum, magnum, uterus and vagina. Glycans in the luminal epithelium and underlying glands were described after staining with 23 lectins after neuraminidase pre-treatment in some cases. Ciliated and non-ciliated cells were evident at all levels in the luminal epithelium, the latter full of richly glycosylated secretory granules.

The influences of cycle stage and pregnancy upon cell glycosylation in the endometrium of the mare.

From Day 6.5-7 post-conception until its loss around Day 22, the equine embryo is enclosed in a mucinous capsule that prevents direct intercellular interaction between the trophectoderm and uterine epithelium. The embryo is, however, bathed in glycoprotein-rich secretions.

A preliminary study of the heterogeneity in endometrial morphology and glycosylation in the uterine horns of the non-pregnant impala (Aepyceros melampus).

Placentation commences only in the right uterine horn in impala (Aepyceros melampus). To investigate possible differences in morphology or glycosylation between the two horns, right and left uterine horns from six non-pregnant, wild impala were examined morphometrically and histochemically using a panel of 23 lectins and an avidin-biotin revealing system. The presence of ovarian 3ß hydroxysteroid dehydrogenase (3ßHSD) and aromatase was also investigated using immunocytochemistry.

Vaginal bioelectrical impedance determines uterine receptivity in mice.

Study Question: Can vaginal bioelectrical impedance (VZ) electrophysiologically determine alterations of the endometrium in preparation for implantation?

Summary Answer: VZ can electrophysiologically detect the sulfation and sialylation changes in the uterine glycocalyx in preparation for implantation.

What Is Known Already: Uterine receptivity is associated with various glycosylation changes that affect negative charge density at the luminal epithelial cell surface. VZ has been used to monitor the oestrous cycle.

Evidence of oxidative stress-induced senescence in mature, post-mature and pathological human placentas.

Introduction: Premature ageing has been implicated in placental dysfunction. Senescence can be activated by oxidative stress, a key intermediary in the pathophysiology of pre-eclampsia. We examined senescence markers across normal gestation, and in pathological and post-mature pregnancies.

A lectin histochemical study to detect variation in glycosylation at the feto-maternal interface in three interbreeding equine species.

Introduction: In this study, we compare glycosylation at the fetomaternal interface in 3 equine species: horse, donkey and zebra, all of which can interbreed to produce hybrids, to assess their glycan similarities and differences.

Methods: Sections cut from 3 specimens of horse (Equus caballus) placenta (50, 200 and 280 days gestation), one donkey (Equus asinus) placenta (65 cm crown-rump length) and 5 specimens of zebra (Equus quagga) placentae (81-239 days gestation) were stained with a panel of 24 biotinylated lectins using an avidin-peroxidase revealing system.

Results: There were only slight quantitative differences in the lectin histochemistry at the feto-maternal interface between all three specimens; zebra placentae expressed more α2,6-linked sialic acid, with α1,2fucosyl residues at the microvillous interface.

Glycosylation and immunocytochemistry of binucleate cells in pronghorn (Antilocapra americana, Antilocapridae) show features of both Giraffidae and Bovidae.

Although the pronghorn (Antilocapra americana) resembles an antelope, its nearest relatives are the giraffe and okapi. In this study we have examined the placentae of 6 pronghorns using lectin- and immunocytochemistry to identify giraffid and bovid features. Binucleate cells (BNC) of the placenta exhibited features intermediate between those of the giraffe and bovine; Dolichos biflorus agglutinin binding - strong in the bovine BNC and absent in the giraffe - was evident in only a subpopulation of BNC while binding to blood vessels, as in the giraffe.

Morphology, histochemistry and glycosylation of the placenta and associated tissues in the European hedgehog (Erinaceus europaeus).

Introduction: There are few descriptions of the placenta and associated tissues of the European hedgehog (Erinaceus europaeus) and here we present findings on a near-term pregnant specimen.

Methods: Tissues were examined grossly and then formalin fixed and wax-embedded for histology and immunocytochemistry (cytokeratin) and resin embedded for lectin histochemistry.

Results: Each of four well-developed and near term hoglets displayed a discoid, haemochorial placenta with typical labyrinth and spongy zones.

Placental endoplasmic reticulum stress in gestational diabetes: the potential for therapeutic intervention with chemical chaperones and antioxidants.

Aims/hypothesis: The aim of this work was to determine whether placental endoplasmic reticulum (ER) stress may contribute to the pathophysiology of gestational diabetes mellitus (GDM) and to test the efficacy of chemical chaperones and antioxidant vitamins in ameliorating that stress in a trophoblast-like cell line in vitro.

Methods: Placental samples were obtained from women suffering from GDM and from normoglycaemic controls and were frozen immediately. Women with GDM had 2 h serum glucose levels > 9.

A simple histochemical method for the identification of cytotrophoblasts in tissue sections.

A simple method for the demonstration of placental cytotrophoblast cells is described, utilising the affinity of the lectin from Bandeiraea simplicifolia-II (BSA-II) for intracellular amylase-sensitive glycogen and a protocol using biotinylated BSA-II followed by an avidin-peroxidase revealing system. In early pregnancy, cytotrophoblast cells in chorionic and anchoring villi are deeply stained and with ongoing differentiation the staining gradually decreases in intensity, suggesting that this lectin can be a useful marker for these cells.

Hemangioblastic foci in human first trimester placenta: Distribution and gestational profile.

Introduction: The human placenta is a site of both hematopoiesis and vasculogenesis. There are reports of hemangioblastic foci (HAF) in the first trimester placenta, but little published information about their spatiotemporal incidence.

Methods: We have used semi-thin sections and whole mount staining techniques on archival early pregnancy hysterectomy material as well as freshly-collected termination tissue.

Functional changes in Hofbauer cell glycobiology during human pregnancy.

Introduction: This study examines the glucose metabolism and glycosylation of villous macrophages (Hofbauer cells) over the course of pregnancy.

Materials And Methods: Sections of placentae from 6 weeks to term were stained with antibodies to α-amylase, glycogen synthase, glycogen phosphorylase and glucose transporters 1 and 3 (GLUT-1 and GLUT-3) while a panel of 24 lectins was applied to resin sections from 4 weeks onwards. Hofbauer cells were identified by the binding of anti-CD 163 antibody.