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https://www.readbyqxmd.com/read/28547857/confocal-endomicroscopy-in-diagnosis-of-intestinal-chronic-graft-versus-host-disease
#1
Kathrin Rieger, Ute Günther, Ulrike Erben, Anja Kühl, Christoph Loddenkemper, Antonio Pezzutto, Britta Siegmund, Christian Bojarski
Graft-versus-host disease (GvHD) is a major complication of allogeneic stem cell transplantation. High-resolution in vivo histology of the intestine by confocal endomicroscopy (CEM) detects acute GvHD (aGvHD) with high sensitivity. This pilot study aims to evaluate the diagnostic value of CEM for intestinal chronic GvHD (cGvHD). The study included 20 patients with gastrointestinal symptoms and confirmed cGvHD in other organs as well as 20 patients with clinically suspected acute GvHD for control. Confocal endomicroscopy was performed as gastroscopy followed by sigmoidoscopy after intravenous injection of fluorescein (10%) and topical application of acriflavine (0...
May 25, 2017: Hematological Oncology
https://www.readbyqxmd.com/read/28545017/12-o-tetradecanoylphorbol-13-acetate-tpa-increases-murine-intestinal-crypt-stem-cell-survival-following-radiation-injury
#2
Yaojie Liang, Hongwei Zhou, Yibing Yao, Ailing Deng, Zhihong Wang, Boning Gao, Minhang Zhou, Yu Cui, Lili Wang, Lei Zhou, Bianhong Wang, Li Wang, Anqi Liu, Lanlan Qiu, Kun Qian, Yejian Lu, Wanping Deng, Xi Zheng, Zhengtao Han, Yonghui Li, Junzhong Sun
Radiation enteropathy is a common complication in cancer patients following radiation therapy. Thus, there is a need for agents that can protect the intestinal epithelium against radiation. 12-O-Tetradecanoylphorbol-13-acetate (TPA) has been shown to induce differentiation and/or apoptosis in multiple cell lines and primary cells. In the current report, we studied the function of TPA in radiation induced enteropathy in cultured rat intestinal epithelial cell line IEC-6 after ionizing radiation (IR) and in mice after high dose total-body gamma-IR (TBI)...
April 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/28536347/the-current-use-of-stem-cells-in-bladder-tissue-regeneration-and-bioengineering
#3
REVIEW
Yvonne Y Chan, Samantha K Sandlin, Eric A Kurzrock, Stephanie L Osborn
Many pathological processes including neurogenic bladder and malignancy necessitate bladder reconstruction, which is currently performed using intestinal tissue. The use of intestinal tissue, however, subjects patients to metabolic abnormalities, bladder stones, and other long-term sequelae, raising the need for a source of safe and reliable bladder tissue. Advancements in stem cell biology have catapulted stem cells to the center of many current tissue regeneration and bioengineering strategies. This review presents the recent advancements in the use of stem cells in bladder tissue bioengineering...
January 6, 2017: Biomedicines
https://www.readbyqxmd.com/read/28536321/-disruption-of-gut-immune-system-caused-by-damage-of-intestinal-stem-cells-and-their-niche-in-graft-versus-host-disease-after-allogeneic-hematopoietic-stem-cell-transplantation
#4
Eiko Hayase, Takanori Teshima
Allogeneic hematopoietic stem cell transplantation(allo-SCT)is curative therapy for various hematological diseases. Graft-versus-host disease(GVHD)and infection remain the main problems in allo-SCT. Gastrointestinal tract is targeted by GVHD. In intestinal GVHD, intestinal stem cells and Paneth cells reside at the base of crypts are damaged by donor T cells. These damage leads to disruption of intestinal mucosal barrier and intestinal dysbiosis, resulting in more exaggerated GVHD. Recently, we and others have reported that R-Spondin1 and interleukin-22 as factors regenerated intestinal tissue homeostasis in murine model of bone marrow transplantation...
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28536318/-the-intestinal-stem-cell-system
#5
Fumiaki Ishibashi, Ryuichi Okamoto, Mamoru Watanabe
The intestinal epithelium harbors stem cells at the bottom of crypts. Intestinal stem cells(ISCs)differentiate toward two alternative lineages of secretory or absorptive cells in a unidirectional manner. Studies have revealed factors that are indispensable for maintaining proliferation and differentiation of ISCs, which are provided from the surrounding environment. Additionally, several back-up systems compensating the sudden and massive loss of the ISC pool has been reported. Recent development of the three-dimensional culture system of ISCs in vitro has greatly contributed to elucidate these functional analyses of ISCs...
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28536281/distinct-roles-of-hes1-in-normal-stem-cells-and-tumor-stem-like-cells-of-the-intestine
#6
Norihiro Goto, Taro Ueo, Akihisa Fukuda, Kenji Kawada, Yoshiharu Sakai, Hiroyuki Miyoshi, Makoto M Taketo, Tsutomu Chiba, Hiroshi Seno
Cancer stem cells (CSC) have attracted attention as therapeutic targets, however, CSC-targeting therapy may disrupt normal tissue homeostasis because many CSC molecules are also expressed by normal stem cells (NSC). Here we demonstrate that NSC-specific and CSC-specific roles of the stem cell transcription factor Hes1 in the intestine enable the feasibility of a specific cancer therapy. Hes1 expression was upregulated in NSC and intestinal tumors. Lineage tracing experiments in adult mouse intestine revealed that Hes1 deletion in Lgr5+ or Bmi1+ NSC resulted in loss of self-renewal but did not perturb homeostasis...
May 23, 2017: Cancer Research
https://www.readbyqxmd.com/read/28533229/intrinsic-regulation-of-enteroendocrine-fate-by-numb
#7
Jérémy Sallé, Louis Gervais, Benjamin Boumard, Marine Stefanutti, Katarzyna Siudeja, Allison J Bardin
How terminal cell fates are specified in dynamically renewing adult tissues is not well understood. Here we explore terminal cell fate establishment during homeostasis using the enteroendocrine cells (EEs) of the adult Drosophila midgut as a paradigm. Our data argue against the existence of local feedback signals, and we identify Numb as an intrinsic regulator of EE fate. Our data further indicate that Numb, with alpha-adaptin, acts upstream or in parallel of known regulators of EE fate to limit Notch signaling, thereby facilitating EE fate acquisition...
May 22, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28531220/highly-conserved-type-1-pili-promote-enterotoxigenic-e-coli-pathogen-host-interactions
#8
Alaullah Sheikh, Rasheduzzaman Rashu, Yasmin Ara Begum, F Matthew Kuhlman, Matthew A Ciorba, Scott J Hultgren, Firdausi Qadri, James M Fleckenstein
Enterotoxigenic Escherichia coli (ETEC), defined by their elaboration of heat-labile (LT) and/or heat-stable (ST) enterotoxins, are a common cause of diarrheal illness in developing countries. Efficient delivery of these toxins requires ETEC to engage target host enterocytes. This engagement is accomplished using a variety of pathovar-specific and conserved E. coli adhesin molecules as well as plasmid encoded colonization factors. Some of these adhesins undergo significant transcriptional modulation as ETEC encounter intestinal epithelia, perhaps suggesting that they cooperatively facilitate interaction with the host...
May 22, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28526587/wnt-%C3%AE-catenin-signaling-in-adult-mammalian-epithelial-stem-cells
#9
REVIEW
Kai Kretzschmar, Hans Clevers
Adult stem cells self-renew and replenish differentiated cells in various organs and tissues throughout a mammal's life. Over the last 25 years an ever-growing body of knowledge has unraveled the essential regulation of adult mammalian epithelia by the canonical Wnt signaling with its key intracellular effector β-catenin. In this review, we discuss the principles of the signaling pathway and its role in adult epithelial stem cells of the intestine and skin during homeostasis and tumorigenesis. We further highlight the research that led to the identification of new stem cell markers and methods to study adult stem cells ex vivo...
May 16, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28524827/impact-of-human-leukocyte-antigen-loci-and-haplotypes-on-intestinal-acute-graft-versus-host-disease-after-human-leukocyte-antigen-matched-sibling-peripheral-blood-stem-cell-transplantation
#10
Fa-Hong Yan, Mei Wang, Jian-Feng Yao, Er-Lie Jiang, Ming-Zhe Han
BACKGROUND: Acute graft-versus-host disease (aGVHD) is a common and severe complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT). Some studies have found that the presence of certain specific human leukocyte antigen (HLA) loci could affect the occurrence of aGVHD. Meanwhile, the impact of HLA haplotypes on aGVHD has been rarely studied. This study aimed to investigate the effects of HLA loci and haplotypes on intestinal aGVHD. METHODS: Totally, 345 consecutive patients undergoing first HLA-matched sibling peripheral blood stem cell transplantation (PBSCT) from February 2004 to June 2013 at Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, were enrolled in this study...
June 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28521687/diet-and-contaminants-driving-the-rise-to-obesity-epidemics
#11
Agostino Di Ciaula, Piero Portincasa
The obesity epidemic is spreading worldwide without reversal trend and despite specific policies oriented to dietary habits and lifestyle, which seem to have modest effects. Genetic factors only partly explain the rise, whereas environmental factors seem to play a key role, mainly by gene-environment interactions through epigenetic mechanisms. A number of animal and human studies point to maternal diet, intestinal microbiota and chemicals introduced as contaminants with food, all factors able to increase the risk of obesity...
May 17, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28514664/lack-of-mttp-activity-in-pluripotent-stem-cell-derived-hepatocytes-and-cardiomyocytes-abolishes-apob-secretion-and-increases-cell-stress
#12
Ying Liu, Donna M Conlon, Xin Bi, Katherine J Slovik, Jianting Shi, Hailey I Edelstein, John S Millar, Ali Javaheri, Marina Cuchel, Evanthia E Pashos, Jahangir Iqbal, M Mahmood Hussain, Robert A Hegele, Wenli Yang, Stephen A Duncan, Daniel J Rader, Edward E Morrisey
Abetalipoproteinemia (ABL) is an inherited disorder of lipoprotein metabolism resulting from mutations in microsomal triglyceride transfer protein (MTTP). In addition to expression in the liver and intestine, MTTP is expressed in cardiomyocytes, and cardiomyopathy has been reported in several ABL cases. Using induced pluripotent stem cells (iPSCs) generated from an ABL patient homozygous for a missense mutation (MTTP(R46G)), we show that human hepatocytes and cardiomyocytes exhibit defects associated with ABL disease, including loss of apolipoprotein B (apoB) secretion and intracellular accumulation of lipids...
May 16, 2017: Cell Reports
https://www.readbyqxmd.com/read/28513991/immunoprotective-effect-of-chitosan-particles-on-hymenolepis-nana-infected-mice
#13
Mahmoud Abdel-Latif, Gamal El-Shahawi, Shawky M Aboelhadid, Heba Abdel-Tawab
Hymenolepis nana is the most commonly known intestinal cestode infecting mainly human. The present study aimed to investigate the potential effect of chitosan particles (CSP) to enhance the immune system against H. nana infection. Determination of worm burden, egg output, histopathological changes, oxidative stress markers (lipid peroxidation & reduced glutathione), goblet (GCs) and mucosal mast cells (MMCs) counts in intestinal ileum were performed. In addition, levels of intestinal mRNA expression of interleukin (IL)-4, IL-9, stem cell factor (SCF), type I & II interferons (IFN)-α/ γ, tumor necrosis factor (TNF)-α, mucin 2 (MUC2), and inducible nitric oxide synthase (iNOs) were investigated using real-time PCR...
May 17, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28512152/papers-of-note-in-nature545-7653
#14
Annalisa M VanHook
This week's articles highlight colon cancer stem cells; cooperative signaling that maintains intestinal stem cell self-renewal; a newly developed Wnt agonist; and metabolic changes in endothelial cells that promote angiogenesis.
May 16, 2017: Science Signaling
https://www.readbyqxmd.com/read/28510488/distinct-effects-of-growth-hormone-and-glutamine-on-activation-of-intestinal-stem-cells
#15
Yun Chen, Sheng-Hong Tseng, Chao-Ling Yao, Chuan Li, Ya-Hui Tsai
BACKGROUND: For patients with short bowel syndrome under parenteral nutrition support, growth hormone (GH) and glutamine (GLN) have been found to help the growth of intestinal mucosa. In this research, we studied the effects of GH and GLN on intestinal stem cells (ISCs). METHODS: The in vitro and in vivo effects of GH and/or GLN on ISCs were evaluated by observing the ability of ISCs to form organoids in a Matrigel culture system. The expression levels of stemness and differentiation markers in ISCs and organoids were assessed using quantitative real-time polymerase chain reaction, immunofluorescence assay, and immunohistochemistry staining...
May 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28509532/nanodiamonds-mediate-oral-delivery-of-proteins-for-stem-cell-activation-and-intestinal-remodeling-in-drosophila
#16
Xingjie Hu, Xiaojiao Li, Min Yin, Ping Li, Ping Huang, Lihua Wang, Yiguo Jiang, Hui Wang, Nan Chen, Chunhai Fan, Haiyun Song
Introduction of exogenous biomacromolecules into living systems is of great interest in genome editing, cancer immunotherapy, and stem cell reprogramming. Whereas current strategies generally depend on nucleic acids transfection, direct delivery of functional proteins that provides enhanced specificity, increased safety, and fast and temporal regulation is highly desirable. Nevertheless, intracellular delivery of intact and bioactive proteins, especially in vivo, remains poorly explored. In this study, we developed a nanodiamonds (NDs)-based protein delivery system in cultured cells and in Drosophila that showed high adsorption, high efficiency, and effective cytosolic release of fully functional proteins...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28505005/gastric-cancer-with-primitive-enterocyte-phenotype-an-aggressive-subgroup-of-intestinal-type-adenocarcinoma
#17
Sho Yamazawa, Tetsuo Ushiku, Aya Shinozaki-Ushiku, Akimasa Hayashi, Akiko Iwasaki, Hiroyuki Abe, Amane Tagashira, Hiroharu Yamashita, Yasuyuki Seto, Hiroyuki Aburatani, Masashi Fukayama
A primitive cell-like gene expression signature is associated with aggressive phenotypes of various cancers. We assessed the expression of phenotypic markers characterizing primitive cells and its correlation with clinicopathologic and molecular characteristics in gastric cancer. Immunohistochemical analysis of a panel of primitive phenotypic markers, including embryonic stem cell markers (OCT4, NANOG, SALL4, CLDN6, and LIN28) and known oncofetal proteins (AFP and GPC3), was performed using tissue microarray on 386 gastric cancers...
May 12, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28498996/protective-factors-in-the-intestinal-microbiome-against-clostridium-difficile-infection-in-recipients-of-allogeneic-hematopoietic-stem-cell-transplantation
#18
Yeon Joo Lee, Esther S Arguello, Robert R Jenq, Eric Littmann, Grace J Kim, Liza C Miller, Lilan Ling, Cesar Figueroa, Elizabeth Robilotti, Miguel-Angel Perales, Juliet N Barker, Sergio Giralt, Marcel R M van den Brink, Eric G Pamer, Ying Taur
Background: Clostridium difficile infection (CDI) is a frequent complication in recipients of allogeneic hematopoietic stem cell transplantation (allo-HSCT), who receive intensive treatments that significantly disrupt the intestinal microbiota. In this study, we examined the microbiota composition of allo-HSCT recipients to identify bacterial colonizers that confer protection against CDI after engraftment. Methods: Feces collected from adult recipients allo-HSCT at engraftment were analyzed; 16S ribosomal RNA genes were sequenced and analyzed from each sample...
April 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28497755/autologous-stem-cell-transplantation-in-treatment-refractory-crohn-s-disease-an-analysis-of-pooled-data-from-the-astic-trial
#19
James O Lindsay, Mathieu Allez, Miranda Clark, Myriam Labopin, Elenor Ricart, Gerhard Rogler, Montserrat Rovira, Jack Satsangi, Dominique Farge, Christopher J Hawkey
BACKGROUND: The randomised controlled ASTIC trial showed no benefit of mobilisation and autologous haematopoietic stem-cell transplantation (HSCT) compared with mobilisation followed by conventional therapy using a stringent primary endpoint (steroid-free clinical remission for 3 months with no endoscopic or radiological evidence of intestinal inflammation) in patients with treatment-refractory Crohn's disease. We now assess HSCT in patients enrolled in the ASTIC trial using endpoints that are traditional for clinical trials in Crohn's disease, and identify factors that predict benefit or harm...
June 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28492553/a-balance-of-mad-and-myc-expression-dictates-larval-cell-apoptosis-and-adult-stem-cell-development-during-xenopus-intestinal-metamorphosis
#20
Morihiro Okada, Thomas C Miller, Luan Wen, Yun-Bo Shi
The Myc/Mad/Max network has long been shown to be an important factor in regulating cell proliferation, death and differentiation in diverse cell types. In general, Myc-Max heterodimers activate target gene expression to promote cell proliferation, although excess of c-Myc can also induce apoptosis. In contrast, Mad competes against Myc to form Mad-Max heterodimers that bind to the same target genes to repress their expression and promote differentiation. The role of the Myc/Mad/Max network during vertebrate development, especially, the so-called postembryonic development, a period around birth in mammals, is unclear...
May 11, 2017: Cell Death & Disease
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