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Intestinal epithelium

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https://www.readbyqxmd.com/read/29150660/gene-expression-profile-changes-in-the-jejunum-of-weaned-piglets-after-oral-administration-of-lactobacillus-or-an-antibiotic
#1
Dongyan Zhang, Tingting Shang, Yan Huang, Sixin Wang, Hui Liu, Jing Wang, Yamin Wang, Haifeng Ji, Rijun Zhang
The small intestine plays an essential role in the health and well-being of animals. Previous studies have shown that Lactobacillus has a protective effect on intestinal morphology, intestinal epithelium integrity and appropriate maturation of gut-associated tissues. Here, gene expression in jejunum tissue of weaned piglets was investigated by RNA-seq analysis after administration of sterile saline, Lactobacillus reuteri, or an antibiotic (chlortetracycline). In total, 401 and 293 genes were significantly regulated by chlortetracycline and L...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146676/epithelial-immunity-priming-defensive-responses-in-the-intestinal-mucosa
#2
Cristina Pardo-Camacho, Ana Maria González-Castro, Bruno Kotska Rodiño-Janeiro, Marc Pigrau, Maria Vicario
As the largest interface between the outside and internal milieu, the intestinal epithelium constitutes the first structural component facing potential luminal threats to homeostasis. This single-cell layer is the epicenter of a tightly-regulated communication network between external and internal factors which converge to prime defensive responses aimed at limiting antigen penetration and the maintenance of intestinal barrier function. The defensive role developed by intestinal epithelial cells (IEC) relies largely on the variety of receptors they express at both extracellular (apical and basolateral) and intracellular compartments, and the capacity of IEC to communicate with immune and nervous systems...
November 16, 2017: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/29144770/equine-intestinal-mucosal-pathobiology
#3
Anthony Blikslager, Liara Gonzalez
The equine intestinal mucosa is intimately involved in maintaining homeostasis both on a systemic level by controlling extracellular fluid movement and at the local level to maintain barrier function. Horses are particularly susceptible to the clinical syndrome of colic, with the most severe cases involving strangulating obstruction that induces ischemia. Because of the mucosal vascular architecture, the mucosal epithelium is particularly susceptible to ischemic injury. The potential for reperfusion injury has been investigated and found to play a minimal role...
November 16, 2017: Annual Review of Animal Biosciences
https://www.readbyqxmd.com/read/29144463/a-single-cell-survey-of-the-small-intestinal-epithelium
#4
Adam L Haber, Moshe Biton, Noga Rogel, Rebecca H Herbst, Karthik Shekhar, Christopher Smillie, Grace Burgin, Toni M Delorey, Michael R Howitt, Yarden Katz, Itay Tirosh, Semir Beyaz, Danielle Dionne, Mei Zhang, Raktima Raychowdhury, Wendy S Garrett, Orit Rozenblatt-Rosen, Hai Ning Shi, Omer Yilmaz, Ramnik J Xavier, Aviv Regev
Intestinal epithelial cells absorb nutrients, respond to microbes, function as a barrier and help to coordinate immune responses. Here we report profiling of 53,193 individual epithelial cells from the small intestine and organoids of mice, which enabled the identification and characterization of previously unknown subtypes of intestinal epithelial cell and their gene signatures. We found unexpected diversity in hormone-secreting enteroendocrine cells and constructed the taxonomy of newly identified subtypes, and distinguished between two subtypes of tuft cell, one of which expresses the epithelial cytokine Tslp and the pan-immune marker CD45, which was not previously associated with non-haematopoietic cells...
November 16, 2017: Nature
https://www.readbyqxmd.com/read/29143340/k2p-task-2-and-kcnq1-kcne3-k-channels-are-major-players-contributing-to-intestinal-anion-and-fluid-secretion
#5
Francisca Julio-Kalajzić, Sandra Villanueva, Johanna Burgos, Margarita Ojeda, L Pablo Cid, Thomas J Jentsch, Francisco V Sepúlveda
Anion and fluid secretion across the intestinal epithelium, a process altered in cystic fibrosis and secretory diarrhoea, is mediated by cAMP-activated CFTR Cl(-) channels and requires the simultaneous activity of basolateral K(+) channels to maintain cellular ionic homeostasis and membrane potential. This function is fulfilled by the cAMP-activated K(+) channel formed by the association of pore-forming KCNQ1 with its obligatory KCNE3 β-subunit. Studies using mice show sizable cAMP-activated intestinal anion secretion in the absence of either KCNQ1 or KCNE3 suggesting that an alternative K(+) conductance must compensate for the loss of KCNQ1/KCNE3 activity...
November 16, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29141958/dna-methylation-defines-regional-identity-of-human-intestinal-epithelial-organoids-and-undergoes-dynamic-changes-during-development
#6
Judith Kraiczy, Komal M Nayak, Kate J Howell, Alexander Ross, Jessica Forbester, Camilla Salvestrini, Roxana Mustata, Sally Perkins, Amanda Andersson-Rolf, Esther Leenen, Anke Liebert, Ludovic Vallier, Philip C Rosenstiel, Oliver Stegle, Gordon Dougan, Robert Heuschkel, Bon-Kyoung Koo, Matthias Zilbauer
OBJECTIVE: Human intestinal epithelial organoids (IEOs) are increasingly being recognised as a highly promising translational research tool. However, our understanding of their epigenetic molecular characteristics and behaviour in culture remains limited. DESIGN: We performed genome-wide DNA methylation and transcriptomic profiling of human IEOs derived from paediatric/adult and fetal small and large bowel as well as matching purified human gut epithelium. Furthermore, organoids were subjected to in vitro differentiation and genome editing using CRISPR/Cas9 technology...
November 15, 2017: Gut
https://www.readbyqxmd.com/read/29140465/short-chain-arabinoxylans-prepared-from-enzymatically-treated-wheat-grain-exert-prebiotic-effects-during-the-broiler-starter-period
#7
N Yacoubi, L Saulnier, E Bonnin, E Devillard, V Eeckhaut, L Rhayat, R Ducatelle, F Van Immerseel
Carbohydrate-degrading multi-enzyme preparations (MEP) are used to improve broiler performances. Their mode of action is complex and not fully understood. In this study, we compared the effect of water-soluble fractions isolated at the pilot scale from wheat grain incubated with (WE) and without (WC) MEP. The fractions were incorporated in a wheat-based diet (0.1% w/w) to feed Ross PM3 broilers and compared with a non-supplemented control group (NC). The body weight gain (BWG), feed intake (FI), and feed conversion ratio (FCR) until d 14 were determined...
November 10, 2017: Poultry Science
https://www.readbyqxmd.com/read/29138796/reactive-oxygen-species-induce-injury-of-the-intestinal-epithelium-during-hyperoxia
#8
Min Zhao, Shimiao Tang, Junchi Xin, Yingliang Wei, Dongyan Liu
Long-term therapeutic hyperoxia may exert serious toxic effects on intestinal epithelial cells in vitro and in vivo. The aim of the present study was to investigate the cause of this intestinal injury under conditions of hyperoxia. Caco-2 cells were treated with different concentrations of hydrogen peroxide (H2O2) and 85% hyperoxia for 24 h. higher rates of injury of Caco-2 cells were observed in the hyperoxia and H2O2 groups compared with the control group. The reactive oxygen species (ROS) level of the hyperoxia group was significantly higher compared with that of the 400 µM H2O2 group...
November 9, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29138116/in-silico-identification-of-genes-involved-in-chronic-metabolic-acidosis
#9
Ishfaq A Sheikh, Adeel Malik, Sameera F M AlBasri, Mohd A Beg
AIMS: Chronic metabolic acidosis (CMA) refers to increased plasma acidity due to disturbed acid-base equilibrium in human body. CMA leads to many dysfunctions including disorders of intestinal metabolism and barrier functions. The human body responds to these intestinal dysfunctions by creating a compensatory mechanism at genomic level in intestinal epithelial cells. This study was to identify the molecular pathways involved in metabolic dysfunction and compensatory adaptations in intestinal epithelium during CMA...
November 11, 2017: Life Sciences
https://www.readbyqxmd.com/read/29137145/dietary-pea-fiber-supplementation-improves-glycemia-and-induces-changes-in-the-composition-of-gut-microbiota-serum-short-chain-fatty-acid-profile-and-expression-of-mucins-in-glucose-intolerant-rats
#10
Zohre Hashemi, Janelle Fouhse, Hyun Seun Im, Catherine B Chan, Benjamin P Willing
Several studies have demonstrated the beneficial impact of dried peas and their components on glucose tolerance; however, the role of gut microbiota as a potential mediator is not fully examined. In this study, we investigated the effect of dietary supplementation with raw and cooked pea seed coats (PSC) on glucose tolerance, microbial composition of the gut, select markers of intestinal barrier function, and short chain fatty acid profile in glucose intolerant rats. Male Sprague Dawley rats were fed high fat diet (HFD) for six weeks to induce glucose intolerance, followed by four weeks of feeding PSC-supplemented diets...
November 12, 2017: Nutrients
https://www.readbyqxmd.com/read/29136370/ochratoxin-a-induced-apoptosis-of-ipec-j2-cells-through-ros-mediated-mitochondrial-permeability-transition-pore-opening-pathway
#11
Hong Wang, Ying Chen, Nianhui Zhai, Xingxiang Chen, Fang Gan, Hu Li, Kehe Huang
With the purpose to explore the mechanisms associated with the intestinal toxicity of OTA, an intestinal porcine epithelial cell line (IPEC-J2) was applied in this study as in vitro models for intestinal epithelium. The results confirmed that OTA induced IPEC-J2 cell toxicity by MTT assay and apoptosis by Hoechst 33258 staining and flow cytometer analysis. And then, we observed that OTA induced the mitochondrial reactive oxygen species (ROS) production and mitochondrial permeability transition pore (mPTP) opening by confocal microscopy...
November 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29133120/enhanced-oral-absorption-and-anticancer-efficacy-of-cabazitaxel-by-overcoming-intestinal-mucus-and-epithelium-barriers-using-surface-polyethylene-oxide-peo-decorated-positively-charged-polymer-lipid-hybrid-nanoparticles
#12
Tianyang Ren, Qian Wang, Ying Xu, Lin Cong, Jingxin Gou, Xiaoguang Tao, Yu Zhang, Haibing He, Tian Yin, Haotian Zhang, Yan Zhang, Xing Tang
Polymer-lipid hybrid nanoparticles, PMONPs, were developed to improve the oral absorption of cabazitaxel (CTX), a semi-synthetic taxane derivative, by overcoming multiple gastrointestinal barriers. The nano-carrier is comprised of a poly(ε-caprolactone) (PCL) and chain triglyceride (MCT) hybrid core for drug loading, and a positively charged surface while slightly concealed with a polyethylene oxide (PEO) shell by insertion of poloxamer 188, with the aim of improving the intestinal mucus permeation and epithelial cell uptake...
November 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29129684/rhoa-gtpase-controls-yap-mediated-ereg-signaling-in-small-intestinal-stem-cell-maintenance
#13
Ming Liu, Zheng Zhang, Leesa Sampson, Xuan Zhou, Kodandaramireddy Nalapareddy, Yuxin Feng, Shailaja Akunuru, Jaime Melendez, Ashley Kuenzi Davis, Feng Bi, Hartmut Geiger, Mei Xin, Yi Zheng
RHOA, a founding member of the Rho GTPase family, is critical for actomyosin dynamics, polarity, and morphogenesis in response to developmental cues, mechanical stress, and inflammation. In murine small intestinal epithelium, inducible RHOA deletion causes a loss of epithelial polarity, with disrupted villi and crypt organization. In the intestinal crypts, RHOA deficiency results in reduced cell proliferation, increased apoptosis, and a loss of intestinal stem cells (ISCs) that mimic effects of radiation damage...
November 6, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/29129657/transport-mechanism-of-lipid-covered-saquinavir-pure-drug-nanoparticles-in-intestinal-epithelium
#14
Dengning Xia, Yuan He, Qiuxia Li, Cunde Hu, Wei Huang, Yunhai Zhang, Feng Wan, Chi Wang, Yong Gan
Pure drug nanoparticles (NPs) represent a promising formulation for improved drug solubility and controlled dissolution velocity. However, limited absorption by the intestinal epithelium remains challenge to their clinical application, and little is known about how these NPs within the cells are transported. To improve cellular uptake and transport of pure nanodrug in cells, here, a lipid covered saquinavir (SQV) pure drug NP (Lipo@nanodrug) was designed by modifying a pure SQV NP (nanodrug) with a phospholipid bilayer...
November 9, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29124968/probiotic-bacteria-cell-walls-stimulate-the-activity-of-the-intestinal-epithelial-cells-and-macrophage-functionality
#15
J M Lemme-Dumit, M A Polti, G Perdigón, C Maldonado Galdeano
The effect of oral administration of probiotic bacteria cell walls (PBCWs) in the stimulation of the immune system in healthy BALB/c mice was evaluated. We focused our investigation mainly on intestinal epithelial cells (IECs) which are essential for coordinating an adequate mucosal immune response and on the functionality of macrophages. The probiotic bacteria and their cell walls were able to stimulate the IECs exhibiting an important activation and cytokine releases. Supplementation with PBCWs promoted macrophage activation from peritoneum and spleen, indicating that the PBCWs oral administration was able to improve the functionality of the macrophages...
November 10, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/29118753/intestinal-epithelial-cell-endoplasmic-reticulum-stress-and-inflammatory-bowel-disease-pathogenesis-an-update-review
#16
REVIEW
Xiaoshi Ma, Zhaolai Dai, Kaiji Sun, Yunchang Zhang, Jingqing Chen, Ying Yang, Patrick Tso, Guoyao Wu, Zhenlong Wu
The intestinal epithelial cells serve essential roles in maintaining intestinal homeostasis, which relies on appropriate endoplasmic reticulum (ER) function for proper protein folding, modification, and secretion. Exogenous or endogenous risk factors with an ability to disturb the ER function can impair the intestinal barrier function and activate inflammatory responses in the host. The last decade has witnessed considerable progress in the understanding of the functional role of ER stress and unfolded protein response (UPR) in the gut homeostasis and its significant contribution to the pathogenesis of inflammatory bowel disease (IBD)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29110754/bacterial-colonization-stimulates-a-complex-physiological-response-in-the-immature-human-intestinal-epithelium
#17
David R Hill, Sha Huang, Melinda S Nagy, Veda K Yadagiri, Courtney Fields, Dishari Mukherjee, Brooke Bons, Priya H Dedhia, Alana M Chin, Yu-Hwai Tsai, Shrikar Thodla, Thomas M Schmidt, Seth Walk, Vincent B Young, Jason R Spence
The human gastrointestinal tract is immature at birth, yet must adapt to dramatic changes such as oral nutrition and microbial colonization. The confluence of these factors can lead to severe inflammatory disease in premature infants; however, investigating complex environment-host interactions is difficult due to limited access to immature human tissue. Here, we demonstrate that the epithelium of human pluripotent stem cell-derived human intestinal organoids is globally similar to the immature human epithelium and we utilize HIOs to investigate complex host-microbe interactions in this naïve epithelium...
November 7, 2017: ELife
https://www.readbyqxmd.com/read/29109724/actors-and-factors-in-the-resolution-of-intestinal-inflammation-lipid-mediators-as-a-new-approach-to-therapy-in-inflammatory-bowel-diseases
#18
REVIEW
Federica Ungaro, Federica Rubbino, Silvio Danese, Silvia D'Alessio
In the last few decades, the pathogenesis of inflammatory bowel disease (IBD) in genetically predisposed subjects susceptible to specific environmental factors has been attributed to disturbance of both the immune and non-immune system and/or to the imbalanced interactions with microbes. However, increasing evidences support the idea that defects in pro-resolving pathways might strongly contribute to IBD onset. The resolution of inflammation is now recognized as a dynamic event coordinated by specialized pro-resolving lipid mediators (LMs), which dampen inflammation-sustaining events, such as angiogenesis, release of pro-inflammatory cytokines, clearance of apoptotic cells, and microorganisms...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29109448/identification-of-claudin-4-binder-that-attenuates-tight-junction-barrier-function-by-tr-fret-based-screening-assay
#19
Akihiro Watari, Miki Kodaka, Koji Matsuhisa, Yuta Sakamoto, Kota Hisaie, Norihito Kawashita, Tatsuya Takagi, Yoshiaki Yamagishi, Hidehiko Suzuki, Hirofumi Tsujino, Kiyohito Yagi, Masuo Kondoh
Claudins are key functional and structural components of tight junctions (TJs) in epithelial cell sheets. The C-terminal fragment of Clostridium perfringens enterotoxin (C-CPE) binds to claudin-4 and reversibly modulates intestinal TJ seals, thereby enhancing paracellular transport of solutes. However, the use of C-CPE as an absorption enhancer is limited by the molecule's immunogenicity and manufacturing cost. Here, we developed a high-throughput screening system based on the Time-Resolved Fluorescence Resonance Energy Transfer (TR-FRET) method to identify claudin-4 binders in a library collection of 32,560 compounds...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29107070/inflammation-driven-colon-neoplasmatogenesis-in-upa-deficient-mice-is-associated-with-an-increased-expression-of-runx-transcriptional-regulators
#20
Hara Afaloniati, George S Karagiannis, Alexandros Hardas, Theofilos Poutahidis, Katerina Angelopoulou
Deregulation of the bone morphogenetic protein (BMP) pathway has been documented in colorectal cancer (CRC). Previously, we investigated possible associations between urokinase-type plasminogen activator (uPA) deficiency and expression of extracellular constituents of BMP signaling in a newly developed mouse model of inflammation-driven intestinal neoplasmatogenesis, in which chronic colitis and CRC are induced using dextran sodium sulfate (DSS). In this report, we explored the contribution of intracellular components of Smad-mediated BMP signal transduction using the same model...
October 26, 2017: Experimental Cell Research
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