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Amnion epithelial cells

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https://www.readbyqxmd.com/read/29726582/extracellular-vesicles-generated-by-placental-tissues-ex-vivo-a-transport-system-for-immune-mediators-and-growth-factors
#1
Wendy Fitzgerald, Nardhy Gomez-Lopez, Offer Erez, Roberto Romero, Leonid Margolis
PROBLEM: To study the mechanisms of placenta function and the role of extracellular vesicles (EVs) in pregnancy, it is necessary to develop an ex vivo system that retains placental cytoarchitecture and the primary metabolic aspects, in particular the release of EVs and soluble factors. Here, we developed such a system and investigated the pattern of secretion of cytokines, growth factors, and extracellular vesicles by placental villous and amnion tissues ex vivo. METHODS OF STUDY: Placental villous and amnion explants were cultured for 2 weeks at the air/liquid interface and their morphology and the released cytokines and EVs were analyzed...
May 4, 2018: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29687742/amniotic-membrane-and-its-epithelial-and-mesenchymal-stem-cells-as-an-appropriate-source-for-skin-tissue-engineering-and-regenerative-medicine
#2
Behrouz Farhadihosseinabadi, Mehrdad Farahani, Tahereh Tayebi, Ameneh Jafari, Felor Biniazan, Khashayar Modaresifar, Hamideh Moravvej, Soheyl Bahrami, Heinz Redl, Lobat Tayebi, Hassan Niknejad
One of the main goals of tissue engineering and regenerative medicine is to develop skin substitutes for treating deep dermal and full thickness wounds. In this regard, both scaffold and cell source have a fundamental role to achieve exactly the same histological and physiological analog of skin. Amnion epithelial and mesenchymal cells possess the characteristics of pluripotent stem cells which have the capability to differentiate into all three germ layers and can be obtained without any ethical concern. Amniotic cells also produce different growth factors, angio-modulatory cytokines, anti-bacterial peptides and a wide range of anti-inflammatory agents which eventually cause acceleration in wound healing...
April 24, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29684686/a-comprehensive-profile-and-inter-individual-variations-analysis-of-the-human-normal-amniotic-fluid-proteome
#3
Xiang Liu, Yijun Song, Zhengguang Guo, Wei Sun, Juntao Liu
Amniotic fluid contains large amounts of proteins produced by amnion epithelial cells, fetal tissues, fetal excretions and placental tissues; thus, it is an important potential source of biomarkers for identifying fetal pathologies. In this study, a pooled AF sample from 7 healthy volunteers was used to provide a comprehensive profile of normal human AF proteome using immunoaffinity depletion of 14 high-abundance proteins. Each individual AF sample was used to analyze inter-individual variations with iTRAQ method...
April 20, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29660299/infection-induced-thrombin-production-a-potential-novel-mechanism-for-preterm-premature-rupture-of-membranes-pprom
#4
Liping Feng, Terrence K Allen, William P Marinello, Amy P Murtha
BACKGROUND: Preterm premature rupture of membranes (PPROM) is a leading contributor to maternal and neonatal morbidity and mortality. Epidemiologic and experimental studies have demonstrated that thrombin causes fetal membrane weakening and subsequently PPROM. Although blood is suspected as the likely source of thrombin in fetal membranes and amniotic fluid of patients with PPROM, this has not been proven. Ureaplasma Parvum (U. parvum) is emerging as a pathogen involved in prematurity, including PPROM, but until now, prothrombin production directly induced by bacteria in fetal membranes has not been described...
April 13, 2018: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29659325/reactive-oxygen-species-mediates-50-hz-magnetic-field-induced-egf-receptor-clustering-via-acid-sphingomyelinase-activation
#5
Liyuan Sun, Liangjing Chen, Lina Bai, Yongpeng Xia, Xiaobo Yang, Wei Jiang, Wenjun Sun
PURPOSE: Exposure to extremely low frequency electromagnetic fields (ELF-MFs) could elicit biological effects including carcinogenesis. However, the detailed mechanisms by which these ELF-MFs interact with biological system are currently unclear. Previously, we found that a 50-Hz magnetic field (MF) exposure could induce epidermal growth factor receptor (EGFR) clustering and phosphorylation on cell membranes. In the present experiment, the possible roles of reactive oxygen species (ROS) in MF-induced EGFR clustering were investigated...
April 16, 2018: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29562784/cellular-and-site-specific-mitochondrial-characterization-of-vital-human-amniotic-membrane
#6
Asmita Banerjee, Andrea Lindenmair, Simone Hennerbichler, Philipp Steindorf, Ralf Steinborn, Andrey V Kozlov, Heinz Redl, Susanne Wolbank, Adelheid Weidinger
Over a century ago, clinicians started to use the human amniotic membrane for coverage of wounds and burn injuries. To date, literally thousands of different clinical applications exist for this biomaterial almost exclusively in a decellularized or denuded form. Recent reconsiderations for the use of vital human amniotic membrane for clinical applications would take advantage of the versatile cells of embryonic origin including the entirety of their cell organelles. Recently, more and more evidence was found, showing mitochondria to be involved in most fundamental cellular processes, such as differentiation and cell death...
January 2018: Cell Transplantation
https://www.readbyqxmd.com/read/29515060/isolation-and-characterization-of-buffalo-bubalus-bubalis-amniotic-mesenchymal-stem-cells-derived-from-amnion-from-the-first-trimester-pregnancy
#7
Yanfei Deng, Guiting Huang, Lingxiu Zou, Tianying Nong, Xiaoling Yang, Jiayu Cui, Yingming Wei, Sufang Yang, Deshun Shi
Amniotic mesenchymal stem cells (AMSCs) from livestock are valuable resources for animal reproduction and veterinary therapeutic. The purpose of this study is to explore a suitable way to isolate and culture the buffalo AMSCs (bAMSCs), and to identify their biological characteristics. Digestion with a combination of trypsin-EDTA and collagenase type I could obtain pure bAMSCs more effectively than trypsin-EDTA or collagenase type I alone. bAMSCs could proliferate steadily in vitro culture and exhibited fibroblastic-like morphology in vortex-shaped colony...
April 27, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29382802/acute-or-delayed-systemic-administration-of-human-amnion-epithelial-cells-improves-outcomes-in-experimental-stroke
#8
Megan A Evans, Rebecca Lim, Hyun Ah Kim, Hannah X Chu, Chantelle V Gardiner-Mann, Kimberly W E Taylor, Christopher T Chan, Vanessa H Brait, Seyoung Lee, Quynh Nhu Dinh, Antony Vinh, Thanh G Phan, Velandai K Srikanth, Henry Ma, Thiruma V Arumugam, David Y Fann, Luting Poh, Cameron P J Hunt, Colin W Pouton, John M Haynes, Stavros Selemidis, William Kwan, Leon Teo, James A Bourne, Silke Neumann, Sarah Young, Emma K Gowing, Grant R Drummond, Andrew N Clarkson, Euan M Wallace, Christopher G Sobey, Brad R S Broughton
BACKGROUND AND PURPOSE: Human amnion epithelial cells (hAECs) are nonimmunogenic, nontumorigenic, anti-inflammatory cells normally discarded with placental tissue. We reasoned that their profile of biological features, wide availability, and the lack of ethical barriers to their use could make these cells useful as a therapy in ischemic stroke. METHODS: We tested the efficacy of acute (1.5 hours) or delayed (1-3 days) poststroke intravenous injection of hAECs in 4 established animal models of cerebral ischemia...
March 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29371755/the-expression-of-toll-like-receptor-5-in-preterm-histologic-chorioamnionitis
#9
Hiroaki Moroi, Tomomi Kotani, Rika Miki, Hiroyuki Tsuda, Masako Mizuno, Yumiko Ito, Takafumi Ushida, Kenji Imai, Tomoko Nakano, Hua Li, Seiji Sumigama, Eiko Yamamoto, Akira Iwase, Fumitaka Kikkawa
Spontaneous preterm birth is often caused by chorioamnionitis. Toll-like receptors (TLRs) have a role in the response of the innate immune system. The role of TLR5 in chorioamnionitis remains unclear: however, TLR5 was reported to have a significantly stronger effect on the induction of interleukin (IL)-6 when compared with other TLRs in amniotic epithelial cells. The aim of this study was to investigate TLR5 expression in placentas with preterm histologic chorioamnionitis (HCA). The expression levels of TLR5 were evaluated in the amnions, chorions, deciduae and villi with and without HCA using immunohistochemistry...
January 2018: Journal of Clinical Biochemistry and Nutrition
https://www.readbyqxmd.com/read/29346426/proliferation-and-survival-of-human-amniotic-epithelial-cells-during-their-hepatic-differentiation
#10
Julieta L Maymó, Rodrigo Riedel, Antonio Pérez-Pérez, Marta Magatti, Bernardo Maskin, José Luis Dueñas, Ornella Parolini, Víctor Sánchez-Margalet, Cecilia L Varone
Stem cells derived from placental tissues are an attractive source of cells for regenerative medicine. Amniotic epithelial cells isolated from human amnion (hAECs) have desirable and competitive characteristics that make them stand out between other stem cells. They have the ability to differentiate toward all three germ layers, they are not tumorigenic and they have immunosuppressive properties. Although liver transplantation is the best way to treat acute and chronic hepatic failure patients, there are several obstacles...
2018: PloS One
https://www.readbyqxmd.com/read/29297621/amnion-epithelial-cell-derived-exosomes-restrict-lung-injury-and-enhance-endogenous-lung-repair
#11
Jean L Tan, Sin N Lau, Bryan Leaw, Hong P T Nguyen, Lois A Salamonsen, Mohamed I Saad, Siow T Chan, Dandan Zhu, Mirja Krause, Carla Kim, William Sievert, Euan M Wallace, Rebecca Lim
Idiopathic pulmonary fibrosis (IPF) is characterized by chronic inflammation, severe scarring, and stem cell senescence. Stem cell-based therapies modulate inflammatory and fibrogenic pathways by release of soluble factors. Stem cell-derived extracellular vesicles should be explored as a potential therapy for IPF. Human amnion epithelial cell-derived exosomes (hAEC Exo) were isolated and compared against human lung fibroblasts exosomes. hAEC Exo were assessed as a potential therapy for lung fibrosis. Exosomes were isolated and evaluated for their protein and miRNA cargo...
February 2018: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/29208979/induction-of-antimicrobial-peptides-secretion-by-il-1%C3%AE-enhances-human-amniotic-membrane-for-regenerative-medicine
#12
Fatemeh A Tehrani, Khashayar Modaresifar, Sara Azizian, Hassan Niknejad
Due to antibacterial characteristic, amnion has been frequently used in different clinical situations. Developing an in vitro method to augment endogenous antibacterial ingredient of amniotic epithelial and mesenchymal stem cells is desirable for a higher efficacy of this promising biomaterial. In this study, epithelial or mesenchymal side dependent effect of amniotic membrane (AM) on antibacterial activity against some laboratory and clinical isolated strains was investigated by modified disk diffusion method and colony count assay...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29207015/human-amniotic-epithelial-cells-regulate-osteoblast-differentiation-through-the-secretion-of-tgf%C3%AE-1-and-microrna-34a-5p
#13
Guiling Wang, Feng Zhao, Di Yang, Jing Wang, Lihong Qiu, Xining Pang
Since the beginning of the use of stem cells in tissue regenerative medicine, there has been a search for optimal sources of stem cells. Human amniotic epithelial cells (hAECs) are derived from human amnions, which are typically discarded as medical waste, but were recently found to include cells with trilineage differentiation potential in vitro. Previous study has focused on the osteogenic differentiation ability of hAECs as seed cells in bone regeneration; however, their paracrine effects on osteoblasts (OBs) are yet to be elucidated...
February 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29193446/a-distinct-mechanism-of-senescence-activation-in-amnion-epithelial-cells-by-infection-inflammation-and-oxidative-stress
#14
Christopher Luke Dixon, Lauren Richardson, Samantha Sheller-Miller, George Saade, Ramkumar Menon
PROBLEM: We investigated p38MAPK activation-induced fetal membrane cell senescence in response to inflammation (tumour necrosis factor-alpha [TNF-α]) and infection (lipopolysaccharide [LPS]), factors associated with spontaneous preterm birth. METHOD OF STUDY: Primary amnion epithelial cells (AECs) were exposed to TNF-α, 50 ng/mL and LPS, 100 ng/mL. Cigarette smoke extract (CSE), a known OS inducer, was used as positive control. AECs were cotreated with the antioxidant N-acetyl cysteine (NAC) and p38MAPK inhibitor SB203580 to determine the effect of OS and p38MAPK...
March 2018: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29191629/effects-of-%C3%AE-9-tetrahydrocannabinol-thc-on-human-amniotic-epithelial-cell-proliferation-and-migration
#15
J L Yao, Q Z He, M Liu, X W Chang, J T Wu, T Duan, K Wang
BACKGROUND: The deleterious effects of cannabis consumption for fertility and pregnancy outcome are recognized for years. The main psychoactive molecule of cannabis, Δ(9)-tetrahydrocannabinol (THC) is able to cross the placenta barrier and cause alterations in fetal growth, low birth weight and preterm labor. However, the effects of THC on the human placenta amnion are still unknown. METHODS: The distributions of CB1R and CB2R in human amnion tissues were observed by immunohistochemistry (IHC)...
February 1, 2018: Toxicology
https://www.readbyqxmd.com/read/29191510/transplantation-of-human-amnion-prevents-recurring-adhesions-and-ameliorates-fibrosis-in-a-rat-model-of-sciatic-nerve-scarring
#16
Angela Lemke, James Ferguson, Kelly Gross, Carina Penzenstadler, Monika Bradl, Rupert Laurenz Mayer, Christopher Gerner, Heinz Redl, Susanne Wolbank
Peripheral nerve fibrosis and painful adhesions are common, recurring pathological sequelae following injury. In this study, vital human amnion (hAM), an increasingly interesting biomaterial for regenerative medicine, was investigated as a novel therapy. hAM was first analyzed in vitro regarding its anti-adhesive characteristics. Then, the reflected region of hAM which was identified as more suitable, was transplanted into female Sprague Dawley rats with recurring sciatic nerve scarring (n = 24) and compared with untreated controls (n = 30) at one, four and twelve weeks...
January 15, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29163213/effect-of-human-amnion-epithelial-cells-on-the-acute-inflammatory-response-in-fetal-sheep
#17
Alana Westover, Jacqueline M Melville, Courtney McDonald, Rebecca Lim, Graham Jenkin, Euan M Wallace, Timothy J Moss
Intra-amniotic (IA) lipopolysaccharide (LPS) injection in sheep induces inflammation in the fetus. Human amnion epithelial cells (hAECs) moderate the effect of IA LPS on fetal development, but their influence on the acute inflammatory response to IA LPS is unknown. We aimed to determine the effects of hAECs on the acute fetal inflammatory response to IA LPS. After surgical instrumentation at 116 days' gestation (d) ewes were randomized to 1 of 4 groups at 123 d: IA LPS (10 mg) and intravenous (IV) saline ( n = 8), IA LPS and IV hAECs ( n = 6), IA saline and IV saline ( n = 5) or IA saline and IV hAECs ( n = 5)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29126435/human-amnion-cells-reverse-acute-and-chronic-pulmonary-damage-in-experimental-neonatal-lung-injury
#18
Dandan Zhu, Jean Tan, Amina S Maleken, Ruth Muljadi, Siow T Chan, Sin N Lau, Kirstin Elgass, Bryan Leaw, Joanne Mockler, Daniel Chambers, Kristen T Leeman, Carla F Kim, Euan M Wallace, Rebecca Lim
BACKGROUND: Despite advances in neonatal care, bronchopulmonary dysplasia (BPD) remains a significant contributor to infant mortality and morbidity. While human amnion epithelial cells (hAECs) have shown promise in small and large animal models of BPD, there is scarce information on long-term benefit and clinically relevant questions surrounding administration strategy remain unanswered. In assessing the therapeutic potential of hAECs, we investigated the impact of cell dosage, administration routes and timing of treatment in a pre-clinical model of BPD...
November 10, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29114223/the-human-amnion-epithelial-cell-secretome-decreases-hepatic-fibrosis-in-mice-with-chronic-liver-fibrosis
#19
Majid Alhomrani, Jeanne Correia, Marcus Zavou, Bryan Leaw, Nathan Kuk, Rong Xu, Mohamed I Saad, Alexander Hodge, David W Greening, Rebecca Lim, William Sievert
Background: Hepatic stellate cells (HSCs) are the primary collagen-secreting cells in the liver. While HSCs are the major cell type involved in the pathogenesis of liver fibrosis, hepatic macrophages also play an important role in mediating fibrogenesis and fibrosis resolution. Previously, we observed a reduction in HSC activation, proliferation, and collagen synthesis following exposure to human amnion epithelial cells (hAEC) and hAEC-conditioned media (hAEC-CM). This suggested that specific factors secreted by hAEC might be effective in ameliorating liver fibrosis...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29030612/healing-of-preterm-ruptured-fetal-membranes
#20
Haruta Mogami, Annavarapu Hari Kishore, Yucel Akgul, R Ann Word
Preterm premature rupture of membrane (pPROM) is associated with 30-40% of preterm births. Infection is considered a leading cause of pPROM due to increased levels of proinflammatory cytokines in amniotic fluid. Only 30%, however, are positive for microbial organisms by amniotic fluid culture. Interestingly, in some pregnancies complicated by preterm premature rupture of membranes (pPROM), membranes heal spontaneously and pregnancy continues until term. Here, we investigated mechanisms of amnion healing. Using a preclinical mouse model, we found that small ruptures of the fetal membrane closed within 72 h whereas healing of large ruptures was only 40%...
October 13, 2017: Scientific Reports
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