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https://www.readbyqxmd.com/read/28821012/multidomain-analyses-of-a-longitudinal-human-microbiome-intestinal-cleanout-perturbation-experiment
#1
Julia Fukuyama, Laurie Rumker, Kris Sankaran, Pratheepa Jeganathan, Les Dethlefsen, David A Relman, Susan P Holmes
Our work focuses on the stability, resilience, and response to perturbation of the bacterial communities in the human gut. Informative flash flood-like disturbances that eliminate most gastrointestinal biomass can be induced using a clinically-relevant iso-osmotic agent. We designed and executed such a disturbance in human volunteers using a dense longitudinal sampling scheme extending before and after induced diarrhea. This experiment has enabled a careful multidomain analysis of a controlled perturbation of the human gut microbiota with a new level of resolution...
August 18, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28817693/clinical-signs-profound-acidemia-hypoglycemia-and-hypernatremia-are-predictive-of-mortality-in-1-400-critically-ill-neonatal-calves-with-diarrhea
#2
Florian M Trefz, Ingrid Lorenz, Annette Lorch, Peter D Constable
Profound acidemia impairs cellular and organ function and consequently should be associated with an increased risk of mortality in critically ill humans and animals. Neonatal diarrhea in calves can result in potentially serious metabolic derangements including profound acidemia due to strong ion (metabolic) acidosis, hyper-D-lactatemia, hyper-L-lactatemia, azotemia, hypoglycemia, hyperkalemia and hyponatremia. The aim of this retrospective study was to assess the prognostic relevance of clinical and laboratory findings in 1,400 critically ill neonatal calves with diarrhea admitted to a veterinary teaching hospital...
2017: PloS One
https://www.readbyqxmd.com/read/28814976/analysis-of-proteomes-released-from-in-vitro-cultured-eight-clostridium-difficile-pcr-ribotypes-revealed-specific-expression-in-pcr-ribotypes-027-and-176-confirming-their-genetic-relatedness-and-clinical-importance-at-the-proteomic-level
#3
Jiri Dresler, Marcela Krutova, Alena Fucikova, Jana Klimentova, Veronika Hruzova, Miloslava Duracova, Katerina Houdkova, Barbora Salovska, Jana Matejkova, Martin Hubalek, Petr Pajer, Libor Pisa, Otakar Nyc
BACKGROUND: Clostridium difficile is the causative agent of C. difficile infection (CDI) that could be manifested by diarrhea, pseudomembranous colitis or life-threatening toxic megacolon. The spread of certain strains represents a significant economic burden for health-care. The epidemic successful strains are also associated with severe clinical features of CDI. Therefore, a proteomic study has been conducted that comprises proteomes released from in vitro cultured panel of eight different PCR ribotypes (RTs) and employs the combination of shotgun proteomics and label-free quantification (LFQ) approach...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28806147/phase-variation-of-clostridium-difficile-virulence-factors
#4
Brandon R Anjuwon-Foster, Rita Tamayo
Clostridium difficile is a leading cause of nosocomial infections, causing disease that ranges from mild diarrhea to potentially fatal colitis. A variety of surface proteins, including flagella, enable C. difficile colonization of the intestine. Once in the intestine, toxigenic C. difficile secretes two glucosylating toxins, TcdA and TcdB, which elicit inflammation and diarrheal disease symptoms. Regulation of colonization factors and TcdA and TcdB is an intense area of research in C. difficile biology. A recent publication from our group describes a novel regulatory mechanism that mediates the ON/OFF expression of co-regulated virulence factors of C...
August 14, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28795249/characterization-of-thymus-associated-lymphoid-depletion-in-bovine-calves-acutely-or-persistently-infected-with-bovine-viral-diarrhea-virus-1-bovine-viral-diarrhea-virus-2-or-hobi-like-pestivirus
#5
Shollie M Falkenberg, Fernando V Bauermann, Julia F Ridpath
Naïve pregnant cattle exposed to pestiviruses between 40-125 days of gestation can give birth to persistently infected (PI) calves. Clinical presentation and survivability, in PI cattle, is highly variable even with the same pestivirus strain whereas the clinical presentation in acute infections is more uniform with severity of symptoms being primarily a function of virulence of the infecting virus. The aim of this study was to compare thymic depletion, as measured by comparing the area of the thymic cortex to the medulla (corticomedullary ratio), in acute and persistent infections of the same pestivirus isolate...
August 9, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28794037/reverse-genetics-system-demonstrates-that-rotavirus-non-structural-protein-nsp6-is-not-essential-for-viral-replication-in-cell-culture
#6
Satoshi Komoto, Yuta Kanai, Saori Fukuda, Masanori Kugita, Takahiro Kawagishi, Naoto Ito, Makoto Sugiyama, Yoshiharu Matsuura, Takeshi Kobayashi, Koki Taniguchi
The use of overlapping open reading frames (ORFs) to synthesize more than one unique protein from a single mRNA has been described for several viruses. Segment 11 of the rotavirus genome encodes two non-structural proteins, NSP5 and NSP6. The NSP6 ORF is present in the vast majority of rotavirus strains, and therefore the NSP6 protein would be expected to have a function in viral replication. However, there is no direct evidence of its function or requirement in the viral replication cycle yet. Here, taking advantage of a recently established plasmid only-based reverse genetics system that allows rescue of recombinant rotaviruses entirely from cloned cDNAs, we generated NSP6-deficient viruses to directly address its significance in the viral replication cycle...
August 9, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28793322/stool-consistency-is-significantly-associated-with-pain-perception
#7
Yukiko Shiro, Young-Chang Arai, Tatsunori Ikemoto, Kazuhiro Hayashi
BACKGROUND: Commensal as well as pathogenic bacteria can influence a variety of gut functions, thereby leading to constipation and diarrhea in severe cases. In fact, several researchers have reported evidence supporting the association between stool consistency or constipation and the Gut microbiome (GM) composition and dysbiosis. GM influences the human health and disease via the gut-brain axis. We thus hypothesized that the pathogenic bacteria increases pain perception to some extent, which means that there could be an association between stool consistency or constipation and pain perception of healthy subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28792526/cryptosporidium-parvum-vaccine-candidates-are-incompletely-modified-with-o-linked-n-acetylgalactosamine-or-contain-n-terminal-n-myristate-and-s-palmitate
#8
John R Haserick, Joshua A Klein, Catherine E Costello, John Samuelson
Cryptosporidium parvum (studied here) and Cryptosporidium hominis are important causes of diarrhea in infants and immunosuppressed persons. C. parvum vaccine candidates, which are on the surface of sporozoites, include glycoproteins with Ser- and Thr-rich domains (Gp15, Gp40, and Gp900) and a low complexity, acidic protein (Cp23). Here we used mass spectrometry to determine that O-linked GalNAc is present in dense arrays on a glycopeptide with consecutive Ser derived from Gp40 and on glycopeptides with consecutive Thr derived from Gp20, a novel C...
2017: PloS One
https://www.readbyqxmd.com/read/28782637/synthesis-and-activity-of-opioid-peptidomimetics-with-%C3%AE-2-and-%C3%AE-3-amino-acids
#9
Katarzyna Gach-Janczak, Justyna Piekielna-Ciesielska, Anna Adamska-Bartłomiejczyk, Renata Perlikowska, Rafał Kruszyński, Alicja Kluczyk, Julia Krzywik, Jarosław Sukiennik, Maria Camilla Cerlesi, Girolamo Calo, Andrzej Wasilewski, Marta Zielińska, Anna Janecka
Morphiceptin (Tyr-Pro-Phe-Pro-NH2) is a selective ligand of the mu opioid receptor, an important target in pain regulation. In this study, morphiceptin was modified at positions 2 or 3 by introduction of β(2)- or β(3)-amino acids and additionally in position 1 by replacing Tyr by Dmt (2',6'-dimethyltyrosine), which resulted in obtaining enzymatically stable analogs with mixed opioid receptor affinity profiles. An analog of the sequence Dmt-d-Ala-(R)-β(2)-1-Nal-Pro-NH2 [Nal=3-(1-naphthyl)-alanine] showed very high activity at the mu and delta receptors in the calcium mobilization functional test but did not cross the artificial membrane imitating the blood-brain barrier...
August 3, 2017: Peptides
https://www.readbyqxmd.com/read/28780968/efficacy-and-safety-of-rifaximin-associated-with-standard-triple-therapy-omeprazole-clarithromycin-and-amoxicillin-for-h-pylori-eradication-a-phase-iv-pilot-clinical-trial
#10
Mercedes Ramas, Maria G Donday, Adrian G McNicholl, Javier P Gisbert
BACKGROUND: A progressive decrease in Helicobacter pylori eradication rates has been described over the years, driving the need for new antibiotic treatments. AIM: To evaluate the efficacy and safety of the addition of rifaximin (Spiraxin(®)) to standard triple therapy (omeprazole, amoxicillin and clarithromycin) for the eradication of H. pylori. METHODS: Independent prospective clinical trial (EUDRACT no.: 2013-001080-23). Forty consecutive adult patients were included with H...
August 3, 2017: Gastroenterología y Hepatología
https://www.readbyqxmd.com/read/28780245/prevalence-and-virulence-gene-profiling-of-enteroaggregative-escherichia-coli-in-malnourished-and-nourished-brazilian-children
#11
Alexandre Havt, Ila Fn Lima, Pedro Hqs Medeiros, Marco Af Clementino, Ana Ks Santos, Marília Smg Amaral, Herlice N Veras, Mara Mg Prata, Noélia L Lima, Alessandra Di Moura, Álvaro M Leite, Alberto M Soares, José Q Filho, Eric R Houpt, James P Nataro, Richard L Guerrant, Aldo Am Lima
The impact of enteroaggregative E. coli (EAEC) infection on childhood malnutrition and inflammation has been suggested, regardless of diarrhea. We investigated whether EAEC and its virulence-related genes (VRGs) are associated with malnutrition in a case-control study. Children aged 6-24 months from Brazil were enrolled as malnourished if weight-for-age Z-score (WAZ) ≤ -2 and nourished if WAZ > -1. Stools were cultured and examined for E. coli. DNA was extracted from fecal isolates and tested for EAEC by polymerase chain reaction (PCR)...
July 4, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28774781/estrogen-signaling-deregulation-related-with-local-immune-response-modulation-in-irritable-bowel-syndrome
#12
REVIEW
Damian Jacenik, Adam I Cygankiewicz, Jakub Fichna, Anna Mokrowiecka, Ewa Małecka-Panas, Wanda M Krajewska
The etiology and pathogenesis underlying irritable bowel syndrome (IBS), a common gastrointestinal disorder are still unclear. Cumulating data suggest dysregulation of inflammatory and immune response pathways and changes of epithelial barrier function. The role of estrogens albeit varied, in responses of immune system is well documented. The aim of this study was to investigate estrogen receptors engagment in IBS subtypes, i.e. constipation predominant (IBS-C) and diarrhea predominant (IBS-D). Furthermore, we analyzed whether estrogen signaling is accompanied by alteration in expression of pro- and anti-inflammatory cytokines and microRNAs that can regulate among others genes involved in immune responses...
July 31, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28770921/insights-into-the-giardia-intestinalis-enolase-and-human-plasminogen-interaction
#13
R Aguayo-Ortiz, P Meza-Cervantez, R Castillo, A Hernández-Campos, L Dominguez, L Yépez-Mulia
Giardia intestinalis is an intestinal parasite that causes diarrhea in humans and animals worldwide. The enolase of G. intestinalis (GiENO) participates in its glycolysis pathway and is abundantly expressed in the parasite cytosol; however, its localization on the surface of trophozoites and cysts has been demonstrated. Enolases from bacteria and parasites can have different functions and are considered moonlighting proteins, for example, as a cell surface plasminogen receptor. In relation to GiENO, no studies have been performed about its possible participation as a plasminogen receptor...
August 3, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28766554/campylobacter-jejuni-impairs-sodium-transport-and-epithelial-barrier-function-via-cytokine-release-in-human-colon
#14
R Bücker, S M Krug, V Moos, C Bojarski, M R Schweiger, M Kerick, A Fromm, S Janßen, M Fromm, N A Hering, B Siegmund, T Schneider, C Barmeyer, J D Schulzke
Campylobacter jejuni is the most prevalent cause of foodborne bacterial enteritis worldwide. Patients present with diarrhea and immune responses lead to complications like arthritis and irritable bowel syndrome. Although studies exist in animal and cell models, we aimed at a functional and structural characterization of intestinal dysfunction and the involved regulatory mechanisms in human colon. First, in patients' colonic biopsies, sodium malabsorption was identified as an important diarrheal mechanism resulting from hampered epithelial ion transport via impaired epithelial sodium channel (ENaC) β- and γ-subunit...
August 2, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28763491/endoscopic-features-of-lymphoid-follicles-using-blue-laser-imaging-bli-endoscopy-in-the-colorectum-and-its-association-with-chronic-bowel-symptoms
#15
Tomomitsu Tahara, Kazuya Takahama, Sayumi Tahara, Dai Yoshida, Noriyuki Horiguchi, Tomohiko Kawamura, Masaaki Okubo, Mitsuo Nagasaka, Yoshihito Nakagawa, Makoto Urano, Tomoyuki Shibata, Tetsuya Tuskamoto, Hiro-O Ieda, Makoto Kuroda, Naoki Ohmiya
BACKGROUND/AIM: In the colorectum, lymphoid follicles hyperplasia (LH) is sometimes observed as small, round, yellowish-white nodules. The novel image-enhanced endoscopy system named blue laser imaging (BLI) provides enhanced the contrast of surface vessels using lasers for light illumination. We investigated the endoscopic features of LH observed by using BLI endoscopy and its association with chronic bowel symptoms. PATIENTS/METHODS: 300 participants undergoing colonoscopy for various indications were enrolled...
2017: PloS One
https://www.readbyqxmd.com/read/28762696/probiotics-for-gastrointestinal-conditions-a-summary-of-the-evidence
#16
REVIEW
Thad Wilkins, Jacqueline Sequoia
Probiotics contain microorganisms, most of which are bacteria similar to the beneficial bacteria that occur naturally in the human gut. Probiotics have been widely studied in a variety of gastrointestinal diseases. The most-studied species include Lactobacillus, Bifidobacterium, and Saccharomyces. However, a lack of clear guidelines on when to use probiotics and the most effective probiotic for different gastrointestinal conditions may be confusing for family physicians and their patients. Probiotics have an important role in the maintenance of immunologic equilibrium in the gastrointestinal tract through the direct interaction with immune cells...
August 1, 2017: American Family Physician
https://www.readbyqxmd.com/read/28761288/influence-of-repeated-senna-laxative-use-on-skin-barrier-function-in-mice
#17
Satoshi Yokoyama, Keiichi Hiramoto, Yurika Yamate, Kazuya Ooi
BACKGROUND: Senna, one of the major stimulant laxatives, is widely used for treating constipation. Chronic senna use has been reported to be associated with colonic disorders such as melanosis coli and/or epithelial hyperplasia. However, there is no obvious information on the influence of chronic senna use on organs except for the intestine. OBJECTIVE: To clarify the influence of senna laxative use on skin barrier function by repeated senna administration. METHODS: Eight-week-old male hairless mice received senna (10 mg/kg/day) for 21 days...
August 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28758592/the-angiotensin-converting-enzyme-2-ace2-gut-microbiota-and-cardiovascular-health
#18
João Marcus Oliveira Andrade, Deborah de Farias Lelis, Valeria Mafra, Junio Cota
The renin-angiotensin system (RAS) is an important enzymatic system responsible for the regulation of biological functions, such as the arterial pressure, hydroelectrolytic control and vascular vasodilatation/vasoconstriction. The RAS component ACE2 acts as a mediator in vasoprotection, and it is highly expressed in the kidney, heart, and testis. Recently, the association between the ACE2 and gut microbiota has been discussed. It is shown that the ACE2/Ang-(1-7) axis modulates the immune response, influencing the microbiota composition, and thus being one of the causes for some diseases physiophatologies, such as diarrhea and intestinal inflammatory disease...
July 28, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28750860/impaired-barrier-function-and-autoantibody-generation-in-malnutrition-enteropathy-in-zambia
#19
Beatrice Amadi, Ellen Besa, Kanekwa Zyambo, Patrick Kaonga, John Louis-Auguste, Kanta Chandwe, Phillip I Tarr, Donna M Denno, James P Nataro, William Faubion, Anne Sailer, Sunil Yeruva, Tricia Brantner, Joseph Murray, Andrew J Prendergast, Jerrold R Turner, Paul Kelly
Intestinal damage in malnutrition constitutes a threat to the survival of many thousands of children globally. We studied children in Lusaka, Zambia, with severe acute malnutrition (SAM) and persistent diarrhea using endoscopy, biopsy and analysis of markers and protective proteins in blood and intestinal secretions. We carried out parallel investigations in apparently healthy adults, and analyzed biomarkers only in apparently healthy children. Villus height and crypt depth did not differ in children with SAM and adult controls, but epithelial surface was reduced in children with SAM (median 445, interquartile range (IQR) 388, 562μm per 100μm muscularis mucosae) compared to adults (578, IQR 465,709; P=0...
August 2017: EBioMedicine
https://www.readbyqxmd.com/read/28748879/early-clinical-manifestations-and-laboratory-findings-before-and-after-treatment-of-cytomegalovirus-infection-in-kidney-transplant-patients
#20
Wasim Ahmed Siddiqui, Issa Al Salmi, Amitabh Jha, Abbas Pakkyara, Mohammad Yasir, Faissal A M Shaheen
Cytomegalovirus (CMV) is one of the most frequently encountered opportunistic viral pathogens in kidney transplant recipients. In this study, we retrospectively reviewed all living related and unrelated kidney transplant recipients on regular follow-up from January 2006 to June 2015, who were suspected to have CMV clinically and confirmed by DNA polymerase chain reaction (PCR). CMV PCR was detected in 102 kidney transplant recipients. The median time of detection after kidney transplant was 21 months, ranging from 15 days to 84 months...
July 2017: Saudi Journal of Kidney Diseases and Transplantation
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