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Microbiota inflammatory bowel disease

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https://www.readbyqxmd.com/read/29471162/hydrogen-peroxide-production-by-lactobacilli-promotes-epithelial-restitution-during-colitis
#1
Ashish K Singh, Rosanne Y Hertzberger, Ulla G Knaus
Inflammatory bowel disease (IBD) is a multifactorial chronic inflammatory disease of the gastrointestinal tract, characterized by cycles of acute flares, recovery and remission phases. Treatments for accelerating tissue restitution and prolonging remission are scarce, but altering the microbiota composition to promote intestinal homeostasis is considered a safe, economic and promising approach. Although probiotic bacteria have not yet fulfilled fully their promise in clinical trials, understanding the mechanism of how they exert beneficial effects will permit devising improved therapeutic strategies...
February 12, 2018: Redox Biology
https://www.readbyqxmd.com/read/29468162/short-term-oral-antibiotics-treatment-promotes-inflammatory-activation-of-colonic-invariant-natural-killer-t-and-conventional-cd4-t-cells
#2
Claudia Burrello, Federica Garavaglia, Fulvia Milena Cribiù, Giulia Ercoli, Silvano Bosari, Flavio Caprioli, Federica Facciotti
The gut mucosa is continuously exposed to a vast community of microorganisms, collectively defined as microbiota, establishing a mutualistic relationship with the host and contributing to shape the immune system. Gut microbiota is acquired at birth, and its composition is relatively stable during the entire adult life. Intestinal dysbiosis, defined as a microbial imbalance of gut bacterial communities, can be caused by several factors, including bacterial infections and antibiotic use, and has been associated with an increased risk to develop or exacerbate immune-mediated pathologies, such as allergic reactions, asthma, and inflammatory bowel diseases...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29468141/impact-of-the-gut-microbiota-on-intestinal-immunity-mediated-by-tryptophan-metabolism
#3
REVIEW
Jing Gao, Kang Xu, Hongnan Liu, Gang Liu, Miaomiao Bai, Can Peng, Tiejun Li, Yulong Yin
The gut microbiota influences the health of the host, especially with regard to gut immune homeostasis and the intestinal immune response. In addition to serving as a nutrient enhancer, L-tryptophan (Trp) plays crucial roles in the balance between intestinal immune tolerance and gut microbiota maintenance. Recent discoveries have underscored that changes in the microbiota modulate the host immune system by modulating Trp metabolism. Moreover, Trp, endogenous Trp metabolites (kynurenines, serotonin, and melatonin), and bacterial Trp metabolites (indole, indolic acid, skatole, and tryptamine) have profound effects on gut microbial composition, microbial metabolism, the host's immune system, the host-microbiome interface, and host immune system-intestinal microbiota interactions...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29467611/the-vagus-nerve-at-the-interface-of-the-microbiota-gut-brain-axis
#4
REVIEW
Bruno Bonaz, Thomas Bazin, Sonia Pellissier
The microbiota, the gut, and the brain communicate through the microbiota-gut-brain axis in a bidirectional way that involves the autonomic nervous system. The vagus nerve (VN), the principal component of the parasympathetic nervous system, is a mixed nerve composed of 80% afferent and 20% efferent fibers. The VN, because of its role in interoceptive awareness, is able to sense the microbiota metabolites through its afferents, to transfer this gut information to the central nervous system where it is integrated in the central autonomic network, and then to generate an adapted or inappropriate response...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29466999/a-probiotic-complex-rosavin-zinc-and-prebiotics-ameliorate-intestinal-inflammation-in-an-acute-colitis-mouse-model
#5
Jin-Sil Park, JeongWon Choi, Ji Ye Kwon, Kyung-Ah Jung, Chul Woo Yang, Sung-Hwan Park, Mi-La Cho
BACKGROUND: An altered gut microbiota balance is involved in the pathogenesis of inflammatory bowel disease (IBD), and several probiotic strains are used as dietary supplements to improve intestinal health. We evaluated the therapeutic effect of 12 probiotics in combination with prebiotics, rosavin, and zinc in the dextran sodium sulfate (DSS)-induced colitis mouse model. METHODS: The probiotic complex or the combination drug was administered orally to mice with DSS-induced colitis, and the body weight, disease activity index, colon length, and histopathological parameters were evaluated...
February 21, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29462379/a-cross-talk-between-microbiota-derived-short-chain-fatty-acids-and-the-host-mucosal-immune-system-regulates-intestinal-homeostasis-and-inflammatory-bowel-disease
#6
Pedro Gonçalves, João Ricardo Araújo, James P Di Santo
Gut microbiota has a fundamental role in the energy homeostasis of the host and is essential for proper "education" of the immune system. Intestinal microbial communities are able to ferment dietary fiber releasing short-chain fatty acids (SCFAs). The SCFAs, particularly butyrate (BT), regulate innate and adaptive immune cell generation, trafficing, and function. For example, BT has an anti-inflammatory effect by inhibiting the recruitment and proinflammatory activity of neutrophils, macrophages, dendritic cells, and effector T cells and by increasing the number and activity of regulatory T cells...
February 15, 2018: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/29441457/effect-of-vsl-3-probiotic-in-a-patient-with-glycogen-storage-disease-type-ia-and-irritable-bowel-disease-like-disease
#7
Miguel Carnero-Gregorio, Alberto Molares-Vila, Alberte Corbalán-Rivas, Carlos Villaverde-Taboada, Carmen Rodríguez-Cerdeira
Gut Inflammatory bowel disease (IBD) is a group of chronic gastrointestinal disorders characterised by relapsing and remitting inflammation of the gastrointestinal tract. The two most common types of IBDs are ulcerative colitis and Crohn's disease. Patients with glycogen storage disease (GSD) type Ia present with gastrointestinal symptoms such as recurrent abdominal pain, bloating and changes in stool form or frequency, which is clinically difficult to distinguish from IBD. We report the case of a 36-year-old man with GSD type Ia and IBD-like disease...
February 13, 2018: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/29440266/essential-immunologic-orchestrators-of-intestinal-homeostasis
#8
REVIEW
Lei Zhou, Gregory F Sonnenberg
Over the past 25 years, substantial advances have been made in our understanding of the cellular and molecular pathways that are essential to maintain a state of health in the mammalian gastrointestinal tract, an organ that is densely colonized by both immune cells and trillions of microbes. Seminal studies in the 1990s identified that several cytokines, antigen-presentation molecules, and components of the T cell receptor were necessary to prevent the development of spontaneous intestinal inflammation in mice...
February 9, 2018: Science Immunology
https://www.readbyqxmd.com/read/29437527/first-victim-later-aggressor-how-the-intestinal-microbiota-drives-the-pro-inflammatory-effects-of-dietary-emulsifiers
#9
Emilie Viennois, Benoit Chassaing
The intestinal tract is inhabited by a large and diverse community of bacteria, collectively referred to as the gut microbiota. Composed of 500-1000 distinct species, the intestinal microbiota plays an important role in immunity and metabolism. However, alterations in its composition are associated with a variety of inflammatory diseases including obesity, diabetes, and inflammatory bowel disease (IBD). Among many other factors, our diet impacts microbiota composition and function, in either beneficial or detrimental ways...
February 13, 2018: Gut Microbes
https://www.readbyqxmd.com/read/29435321/the-gut-microbiota-bile-acids-and-their-correlation-in-primary-sclerosing-cholangitis-associated-with-inflammatory-bowel-disease
#10
J Torres, C Palmela, H Brito, X Bao, H Ruiqi, P Moura-Santos, J Pereira da Silva, A Oliveira, C Vieira, K Perez, S H Itzkowitz, J F Colombel, L Humbert, D Rainteau, M Cravo, C M Rodrigues, J Hu
Background: Patients with primary sclerosing cholangitis associated with inflammatory bowel disease (PSC-IBD) have a very high risk of developing colorectal neoplasia. Alterations in the gut microbiota and/or gut bile acids could account for the increase in this risk. However, no studies have yet investigated the net result of cholestasis and a potentially altered bile acid pool interacting with a dysbiotic gut flora in the inflamed colon of PSC-IBD. Aim: The aim of this study was to compare the gut microbiota and stool bile acid profiles, as well as and their correlation in patients with PSC-IBD and inflammatory bowel disease alone...
February 2018: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/29426710/diagnostics-and-treatments-in-chronic-diarrhea-and-weight-loss-in-horses
#11
REVIEW
Olimpo Oliver-Espinosa
Chronic diarrhea in the horse is defined as diarrhea present for more than several days with little if any improvement. The diagnosis and treatment of horses with chronic diarrhea usually present a great challenge to the clinician. There are many limitations to treatment of these patients given the limited numbers in which a final diagnosis can be achieved. The lack of knowledge of the alterations of horse microbiota during chronic diarrhea and the multiplicity of causes also make treatment challenging. A poor prognosis is often attached to chronic diarrhea, particularly in cases with neoplasia and inflammatory bowel disease...
February 6, 2018: Veterinary Clinics of North America. Equine Practice
https://www.readbyqxmd.com/read/29426057/inflammatory-bowel-disease-and-clostridium-difficile-infection-contrasting-views-of-international-clinical-professionals
#12
Andreas Stallmach, Veli-Jukka Anttila, Markus Hell, Simon Gwynn, Paloma Merino-Amador, Nicola Petrosillo, Zdenek Ráčil, Tim Warren, Christoph Wenisch, Mark Wilcox
INTRODUCTION:  In patients with inflammatory bowel disease (IBD), Clostridium difficile infection (CDI) is a risk factor for both morbidity and mortality. Currently, appropriate management is unclear. Guidance on best practice in the diagnosis and treatment of CDI in IBD patients is therefore needed. METHODS:  A multidisciplinary group of clinicians involved in the treatment of patients with IBD and CDI developed 27 consensus statements. Respondents were asked to rate their agreement with each statement using a 4-point Likert scale...
February 9, 2018: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/29424399/-presence-of-intracellular-escherichia-coli-in-patients-with-inflammatory-bowel-disease
#13
Marjorie De La Fuente, Isidora Chahuán, RocÍo Gutiérrez, David Díaz-Jiménez, Mauricio Olivares, Roberto Vidal, Daniela Simian, Carolina Figueroa, Rodrigo Quera, Marcela A Hermoso
BACKGROUND: Different strains of invasive Escherichia coli (E. coli), isolated from intestinal mucosa of patients, are related to the pathogenesis of inflammatory bowel diseases (IBD). AIM: To evaluate an association between intracellular E. coli and IBD; its clinical characteristics and use of steroids. MATERIAL AND METHODS: Sixty one patients with Crohn's disease and 83 with ulcerative colitis were studied. To determine the intracellular E...
September 2017: Revista Médica de Chile
https://www.readbyqxmd.com/read/29422899/sensing-bacterial-induced-dna-damaging-effects-via-natural-killer-group-2-member-d-immune-receptor-from-dysbiosis-to-autoimmunity-and-carcinogenesis
#14
REVIEW
J Luis Espinoza, Mika Minami
The human genome is constantly exposed to exogenous and endogenous DNA damaging factors that frequently cause DNA damages. Unless repaired, damaged DNA can result in deleterious mutations capable of causing malignant transformation. Accordingly, cells have developed an advanced and effective surveillance system, the DNA damage response (DDR) pathway, which maintains genetic integrity. In addition to well-defined outcomes, such as cell cycle arrest, apoptosis, and senescence, another consequence of DDR activation is the induction of natural killer group 2 member D ligands (NKG2D-Ls) on the surface of stressed cells...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29422795/immunological-pathogenesis-of-inflammatory-bowel-disease
#15
REVIEW
Seung Hoon Lee, Jeong Eun Kwon, Mi-La Cho
Inflammatory bowel disease (IBD) is a chronic inflammatory state of the gastrointestinal tract and can be classified into 2 main clinical phenomena: Crohn's disease (CD) and ulcerative colitis (UC). The pathogenesis of IBD, including CD and UC, involves the presence of pathogenic factors such as abnormal gut microbiota, immune response dysregulation, environmental changes, and gene variants. Although many investigations have tried to identify novel pathogenic factors associated with IBD that are related to environmental, genetic, microbial, and immune response factors, a full understanding of IBD pathogenesis is unclear...
January 2018: Intestinal Research
https://www.readbyqxmd.com/read/29416538/divergent-roles-of-interferon-%C3%AE-and-innate-lymphoid-cells-in-innate-and-adaptive-immune-cell-mediated-intestinal-inflammation
#16
Jennifer Brasseit, Cheong K C Kwong Chung, Mario Noti, Daniel Zysset, Nina Hoheisel-Dickgreber, Vera Genitsch, Nadia Corazza, Christoph Mueller
Aberrant interferon gamma (IFNγ) expression is associated with the pathogenesis of numerous autoimmune- and inflammatory disorders, including inflammatory bowel diseases (IBD). However, the requirement of IFNγ for the pathogenesis of chronic intestinal inflammation remains controversial. The aim of this study was thus to investigate the role of IFNγ in experimental mouse models of innate and adaptive immune cell-mediated intestinal inflammation using genetically and microbiota-stabilized hosts. While we find that IFNγ drives acute intestinal inflammation in the anti-CD40 colitis model in an innate lymphoid cell (ILC)-dependent manner, IFNγ secreted by both transferred CD4 T cells and/or cells of the lymphopenic Rag1 -/- recipient mice was dispensable for CD4 T cell-mediated colitis...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29416535/nutrients-mediate-intestinal-bacteria-mucosal-immune-crosstalk
#17
REVIEW
Ning Ma, Pingting Guo, Jie Zhang, Ting He, Sung Woo Kim, Guolong Zhang, Xi Ma
The intestine is the shared site of nutrient digestion, microbiota colonization and immune cell location and this geographic proximity contributes to a large extent to their interaction. The onset and development of a great many diseases, such as inflammatory bowel disease and metabolic syndrome, will be caused due to the imbalance of body immune. As competent assistants, the intestinal bacteria are also critical in disease prevention and control. Moreover, the gut commensal bacteria are essential for development and normal operation of immune system and the pathogens are also closely bound up with physiological disorders and diseases mediated by immune imbalance...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29414937/c-maf-dependent-regulatory-t-cells-mediate-immunological-tolerance-to-a-gut-pathobiont
#18
Mo Xu, Maria Pokrovskii, Yi Ding, Ren Yi, Christy Au, Oliver J Harrison, Carolina Galan, Yasmine Belkaid, Richard Bonneau, Dan R Littman
Both microbial and host genetic factors contribute to the pathogenesis of autoimmune diseases. There is accumulating evidence that microbial species that potentiate chronic inflammation, as in inflammatory bowel disease, often also colonize healthy individuals. These microorganisms, including the Helicobacter species, can induce pathogenic T cells and are collectively referred to as pathobionts. However, how such T cells are constrained in healthy individuals is not yet understood. Here we report that host tolerance to a potentially pathogenic bacterium, Helicobacter hepaticus, is mediated by the induction of RORγt+FOXP3+ regulatory T (iTreg) cells that selectively restrain pro-inflammatory T helper 17 (TH17) cells and whose function is dependent on the transcription factor c-MAF...
February 7, 2018: Nature
https://www.readbyqxmd.com/read/29404425/gut-microbiota-offers-universal-biomarkers-across-ethnicity-in-inflammatory-bowel-disease-diagnosis-and-infliximab-response-prediction
#19
Youlian Zhou, Zhenjiang Zech Xu, Yan He, Yunsheng Yang, Le Liu, Qianyun Lin, Yuqiang Nie, Mingsong Li, Fachao Zhi, Side Liu, Amnon Amir, Antonio González, Anupriya Tripathi, Minhu Chen, Gary D Wu, Rob Knight, Hongwei Zhou, Ye Chen
Gut microbiota dysbiosis contributes to the onset and perpetuation of inflammatory bowel disease (IBD). Given that gut microbiotas vary across geography and ethnicity, it remains obscure whether any universal microbial signatures for IBD diagnosis and prognosis evaluation exist irrespective of populations. Here we profiled the fecal microbiota of a series of Chinese IBD patients and combined them with two Western IBD cohorts, PRISM and RISK, for meta-analyses. We found that the gut microbial alteration patterns in IBD are similar among Chinese and Westerners...
January 2018: MSystems
https://www.readbyqxmd.com/read/29402771/micro-integral-membrane-protein-mimp-a-newly-discovered-anti-inflammatory-protein-of-lactobacillus-plantarum-enhances-the-gut-barrier-and-modulates-microbiota-and-inflammatory-cytokines
#20
Mingming Yin, Xuebing Yan, Wenhao Weng, Yongzhi Yang, Renyuan Gao, Minfeng Liu, Cheng Pan, Qi Zhu, Hao Li, Qing Wei, Tongyi Shen, Yanlei Ma, Huanlong Qin
BACKGROUND/AIMS: Recent studies have demonstrated that the manipulation of the gut microbiome represents a promising treatment for inflammatory bowel disease (IBD). We previously identified micro integral membrane protein (MIMP) as the smallest domain of surface layer protein from Lactobacillus Plantarum. However, the therapeutic relevance of MIMP in IBD remains unknown. METHODS: We initially employed a dextran sodium sulphate (DSS)-induced colitis model and evaluated the effect of MIMP on the inflammation response, intestinal barrier and gut microbiota using histological examination, Fluorescein isothiocyanate-Dextran detection and pyrosequencing analysis respectively...
January 25, 2018: Cellular Physiology and Biochemistry
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