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https://www.readbyqxmd.com/read/28428788/the-protective-role-of-type-i-interferons-in-the-gastrointestinal-tract
#1
REVIEW
Kevin P Kotredes, Brianna Thomas, Ana M Gamero
The immune system of the gastrointestinal (GI) tract manages the significant task of recognizing and eliminating pathogens while maintaining tolerance of commensal bacteria. Dysregulation of this delicate balance can be detrimental, resulting in severe inflammation, intestinal injury, and cancer. Therefore, mechanisms to relay important signals regulating cell growth and immune reactivity must be in place to support GI homeostasis. Type I interferons (IFN-I) are a family of pleiotropic cytokines, which exert a wide range of biological effects including promotion of both pro- and anti-inflammatory activities...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28424943/intestinal-alkaline-phosphatase-attenuates-alcohol-induced-hepatosteatosis-in-mice
#2
Sulaiman R Hamarneh, Byeong-Moo Kim, Kanakaraju Kaliannan, Sara A Morrison, Tyler J Tantillo, Qingsong Tao, Mussa M Rafat Mohamed, Juan M Ramirez, Aaron Karas, Wei Liu, Dong Hu, Abeba Teshager, Sarah Shireen Gul, Konstantinos P Economopoulos, Atul K Bhan, Madhu S Malo, Michael Y Choi, Richard A Hodin
BACKGROUND AND AIMS: Bacterially derived factors from the gut play a major role in the activation of inflammatory pathways in the liver and in the pathogenesis of alcoholic liver disease. The intestinal brush-border enzyme intestinal alkaline phosphatase (IAP) detoxifies a variety of bacterial pro-inflammatory factors and also functions to preserve gut barrier function. The aim of this study was to investigate whether oral IAP supplementation could protect against alcohol-induced liver disease...
April 19, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28424327/rig-i-mavs-and-sting-signaling-promote-gut-integrity-during-irradiation-and-immune-mediated-tissue-injury
#3
Julius C Fischer, Michael Bscheider, Gabriel Eisenkolb, Chia-Ching Lin, Alexander Wintges, Vera Otten, Caroline A Lindemans, Simon Heidegger, Martina Rudelius, Sébastien Monette, Kori A Porosnicu Rodriguez, Marco Calafiore, Sophie Liebermann, Chen Liu, Stefan Lienenklaus, Siegfried Weiss, Ulrich Kalinke, Jürgen Ruland, Christian Peschel, Yusuke Shono, Melissa Docampo, Enrico Velardi, Robert R Jenq, Alan M Hanash, Jarrod A Dudakov, Tobias Haas, Marcel R M van den Brink, Hendrik Poeck
The molecular pathways that regulate the tissue repair function of type I interferon (IFN-I) during acute tissue damage are poorly understood. We describe a protective role for IFN-I and the RIG-I/MAVS signaling pathway during acute tissue damage in mice. Mice lacking mitochondrial antiviral-signaling protein (MAVS) were more sensitive to total body irradiation- and chemotherapy-induced intestinal barrier damage. These mice developed worse graft-versus-host disease (GVHD) in a preclinical model of allogeneic hematopoietic stem cell transplantation (allo-HSCT) than did wild-type mice...
April 19, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28423466/zonulin-transgenic-mice-show-altered-gut-permeability-and-increased-morbidity-mortality-in-the-dss-colitis-model
#4
Craig Sturgeon, Jinggang Lan, Alessio Fasano
Increased small intestinal permeability (IP) has been proposed to be an integral element, along with genetic makeup and environmental triggers, in the pathogenies of chronic inflammatory diseases (CIDs). We identified zonulin as a master regular of intercellular tight junctions linked to the development of several CIDs. We aim to study the role of zonulin-mediated IP in the pathogenesis of CIDs. Zonulin transgenic Hp2 mice (Ztm) were subjected to dextran sodium sulfate (DSS) treatment for 7 days, followed by 4-7 days' recovery and compared to C57Bl/6 (wild-type (WT)) mice...
April 19, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28421423/the-effects-of-direct-fed-microbial-supplementation-as-an-alternative-to-antibiotics-on-growth-performance-intestinal-immune-status-and-epithelial-barrier-gene-expression-in-broiler-chickens
#5
U Gadde, S T Oh, Y S Lee, E Davis, N Zimmerman, T Rehberger, Hyun S Lillehoj
The objective of this study was to investigate the effects of Bacillus subtilis-based probiotic supplementation in broiler chicken diets on growth performance, feed efficiency, intestinal cytokine, and tight junction (TJ) protein mRNA expression. Zero-day-old broiler chicks (n = 140) were randomly assigned to one of five dietary treatments: basal diet (CON); basal diet supplemented with either antibiotic bacitracin methylene disalicylate (BMD); or probiotics, namely, B. subtilis strain 1781 (PB1), a combination of B...
April 18, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/28416740/multi-targeting-therapeutic-mechanisms-of-the-chinese-herbal-medicine-qhd-in-the-treatment-of-non-alcoholic-fatty-liver-disease
#6
Qin Feng, Wensheng Liu, Susan S Baker, Hongshan Li, Cheng Chen, Qian Liu, Shijie Tang, Lingyu Guan, Maria Tsompana, Rafal Kozielski, Robert D Baker, Jinghua Peng, Ping Liu, Ruixin Zhu, Yiyang Hu, Lixin Zhu
Beneficial effects of the Chinese herbal medicine Qushi Huayu Decoction (QHD) were observed with non-alcoholic fatty liver disease (NAFLD) patients and animal models. The impact of QHD or its active components (geniposide and chlorogenic acid, GC) on NAFLD liver transcriptome and gut microbiota was examined with NAFLD rats. Increased expression for genes required for glutathione production and decreased expression for genes required for lipid synthesis was observed in NAFLD livers treated with QHD and GC. GC treatment decreased serum LPS, which could be explained by reduced mucosal damage in the colon of GC-treated rats...
February 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28413062/assessment-of-mucosal-integrity-by-quantifying-neutrophil-granulocyte-influx-in-murine-models-of-acute-intestinal-injury
#7
Julius Clemens Fischer, Alexander Wintges, Tobias Haas, Hendrik Poeck
Intact epithelial body surfaces represent physical barriers which protect the organism from invading pathogens and loss of nutrients. Barrier malfunction is closely linked to disorders such as inflammatory bowel disease and graft-versus-host disease. In fact, several pharmacological or radiobiological therapeutic strategies have side effects that affect epithelial surfaces. In this context, assays that accurately assess epithelial barrier integrity in patients and animal models are crucial to create a better understanding of the mechanisms leading to disease or limiting therapeutic approaches due to barrier disruption...
April 11, 2017: Cellular Immunology
https://www.readbyqxmd.com/read/28412519/vitamin-d-signaling-in-intestinal-innate-immunity-and-homeostasis
#8
REVIEW
Vassil Dimitrov, John H White
The lumen of the gut hosts a plethora of microorganisms that participate in food assimilation, inactivation of harmful particles and in vitamin synthesis. On the other hand, enteric flora, a number of food antigens, and toxins are capable of triggering immune responses causing inflammation, which, when unresolved, may lead to chronic conditions such as inflammatory bowel disease (IBD). It is important, therefore, to contain the gut bacteria within the lumen, control microbial load and composition, as well as ensure adequate innate and adaptive immune responses to pathogenic threats...
April 12, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28410406/lubiprostone-improves-intestinal-permeability-in-humans-a-novel-therapy-for-the-leaky-gut-a-prospective-randomized-pilot-study-in-healthy-volunteers
#9
Takayuki Kato, Yasushi Honda, Yusuke Kurita, Akito Iwasaki, Takamitsu Sato, Takaomi Kessoku, Shiori Uchiyama, Yuji Ogawa, Hidenori Ohkubo, Takuma Higurashi, Takeharu Yamanaka, Haruki Usuda, Koichiro Wada, Atsushi Nakajima
BACKGROUND AND AIMS: The barrier function of the small intestinal mucosa prevents the introduction of undesired pathogens into the body. Breakdown of this barrier function increases intestinal permeability. This has been proposed to induce not only gastrointestinal diseases, including inflammatory bowel disease and irritable bowel syndrome, but also various other diseases, including allergies, diabetes mellitus, liver diseases, and collagen diseases, which are associated with this so called "leaky gut syndrome...
2017: PloS One
https://www.readbyqxmd.com/read/28405139/regulation-of-intestinal-permeability-the-role-of-proteases
#10
REVIEW
Hanne Van Spaendonk, Hannah Ceuleers, Leonie Witters, Eveline Patteet, Jurgen Joossens, Koen Augustyns, Anne-Marie Lambeir, Ingrid De Meester, Joris G De Man, Benedicte Y De Winter
The gastrointestinal barrier is - with approximately 400 m(2) - the human body's largest surface separating the external environment from the internal milieu. This barrier serves a dual function: permitting the absorption of nutrients, water and electrolytes on the one hand, while limiting host contact with noxious luminal antigens on the other hand. To maintain this selective barrier, junction protein complexes seal the intercellular space between adjacent epithelial cells and regulate the paracellular transport...
March 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28404517/dysregulation-of-microrna-biogenesis-in-the-small-intestine-after-ethanol-and-burn-injury
#11
Niya L Morris, Adam M Hammer, Abigail R Cannon, Robin C Gagnon, Xiaoling Li, Mashkoor A Choudhry
Ethanol exposure at the time of burn injury is a major contributor to post-burn pathogenesis. Many of the adverse effects associated with ethanol and burn injury are linked to an impaired intestinal barrier. The combined insult causes intestinal inflammation, resulting in tissue damage, altered tight junction expression, and increased intestinal permeability. MicroRNAs play a critical role in maintaining intestinal homeostasis including intestinal inflammation and barrier function. Specifically, miR-150 regulates inflammatory mediators which can contribute to gut barrier disruption...
April 9, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28403983/the-role-of-the-gut-microbiota-in-sepsis
#12
REVIEW
Bastiaan W Haak, W Joost Wiersinga
For decades, the gut was thought to play an important role in sepsis pathogenesis. Sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection. Organ failure assessment for sepsis focuses on respiratory, cardiovascular, hepatic, renal, neurological, and haematological systems. Unfortunately, symptoms of gut failure are non-specific and are therefore not assessed. The composition of the intestinal microbiome, however, is affected by sepsis, and might contribute to the development of organ failure...
February 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28400412/western-diet-consumption-induces-alteration-of-barrier-function-mechanisms-in-the-ileum-that-correlates-with-metabolic-endotoxemia-in-rats
#13
Mathilde Guerville, Anaïs Leroy, Annaëlle Sinquin, Fabienne Laugerette, Marie-Caroline Michalski, Gaëlle Boudry
Obesity and its related disorders have been associated to the presence in the blood of gut bacteria-derived lipopolysaccharides (LPS). However, the factors underlying this low-grade elevation in plasma LPS, so-called metabolic endotoxemia, are not fully elucidated. We aimed to investigate the effects of Western diet (WD) feeding on intestinal and hepatic LPS handling mechanisms in a rat model of diet-induced obesity (DIO). Rats were fed either a standard chow diet (C) or a Western Diet (WD, 45% fat) for 6 weeks...
April 11, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28400259/a-role-for-the-peripheral-immune-system-in-the-development-of-alcohol-use-disorders
#14
REVIEW
Philippe de Timary, Peter Stärkel, Nathalie M Delzenne, Sophie Leclercq
Preclinical studies have largely supported that alcohol-consumption induces the development of an important neuro-inflammation and this neuro-inflammation contributes to alcohol-drinking behaviors, notably through TLR4 and LPS related mechanisms. The neuro-inflammation originates from a direct interaction of ethanol with the neuronal and immune brain cells, but also from the generation of an inflammation at the periphery. Ethanol in particular interacts with the intestine to develop a gut dysbiosis and an increase in gut permeability, that allows the liberation of bacterial fragments to the systemic circulation and induces a pro-inflammatory response in the systemic circulation and peripheral organs, and in particular the liver...
April 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28396623/modified-mediterranean-diet-for-enrichment-of-short-chain-fatty-acids-potential-adjunctive-therapeutic-to-target-immune-and-metabolic-dysfunction-in-schizophrenia
#15
Jamie Joseph, Colin Depp, Pei-An B Shih, Kristen S Cadenhead, Geert Schmid-Schönbein
Growing interest in gut and digestive processes and their potential link to brain and peripheral based inflammation or biobehavioral phenotypes has led to an increasing number of basic and translational scientific reports focused on the role of gut microbiota within the context of neuropsychiatric disorders. However, the effect of dietary modification on specific gut metabolites, in association with immune, metabolic, and psychopathological functioning in schizophrenia spectrum disorders has not been well characterized...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28389744/the-gut-kidney-axis-in-iga-nephropathy-role-of-microbiota-and-diet-on-genetic-predisposition
#16
Rosanna Coppo
Recent data suggest that gut-associated lymphoid tissue (GALT) plays a major role in the development of immunoglobulin A (IgA) nephropathy (IgAN). A genome-wide association study showed that most loci associated with the risk of IgAN are also associated with immune-mediated inflammatory bowel diseases, maintenance of the intestinal barrier and regulation of response to gut pathogens. Studies involving experimental models have demonstrated a pivotal role of intestinal microbiota in the development of IgAN in mice producing high levels of IgA and in transgenic mice overexpressing BAFF, a B-cell factor crucial for IgA synthesis, indicating the role of genetic background, B-cell activity, GALT intestinal immunity and diet...
April 7, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28385840/genome-sequences-of-potential-probiotic-lactobacillus-rhamnosus-isolates-from-human-infants
#17
Jason W Arnold, Andrea Monteagudo-Mera, Eric Altermann, Maria Belen Cadenas, Amanda L Thompson, M Andrea Azcarate-Peril
Probiotics provide health benefits to their hosts, including modulation of host immune response, inhibition of colonization by pathogens, modulation of the gut microbiota, and epithelial barrier enhancement. Here, we present the draft genome sequences of two newly isolated Lactobacillus rhamnosus strains of probiotic potential from healthy human infants.
April 6, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28382453/metabolic-adaptation-to-the-aqueous-leaf-extract-of-moringa-oleifera-lam-supplemented-diet-is-related-to-the-modulation-of-gut-microbiota-in-mice
#18
Xiaoyu Gao, Qiuhong Xie, Ling Liu, Ping Kong, Jun Sheng, Hongyu Xiang
The aqueous leaf extract of Moringa oleifera Lam. (LM-A) is reported to have many health beneficial bioactivities and no obvious toxicity, but have mild adverse effects. Little is known about the mechanism of these reported adverse effects. Notably, there has been no report about the influence of LM-A on intestinal microecology. In this study, animal experiments were performed to explore the relationships between metabolic adaptation to an LM-A-supplemented diet and gut microbiota changes. After 8-week feeding with normal chow diet, the body weight of mice entered a stable period, and one of the group received daily doses of 750-mg/kg body weight LM-A by gavage for 4 weeks (assigned as LM); the other group received the vehicle (assigned as NCD)...
April 5, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28377528/listeriolysin-s-is-a-streptolysin-s-like-virulence-factor-that-targets-exclusively-prokaryotic-cells-in-vivo
#19
Juan J Quereda, Marie A Nahori, Jazmín Meza-Torres, Martin Sachse, Patricia Titos-Jiménez, Jaime Gomez-Laguna, Olivier Dussurget, Pascale Cossart, Javier Pizarro-Cerdá
Streptolysin S (SLS)-like virulence factors from clinically relevant Gram-positive pathogens have been proposed to behave as potent cytotoxins, playing key roles in tissue infection. Listeriolysin S (LLS) is an SLS-like hemolysin/bacteriocin present among Listeria monocytogenes strains responsible for human listeriosis outbreaks. As LLS cytotoxic activity has been associated with virulence, we investigated the LLS-specific contribution to host tissue infection. Surprisingly, we first show that LLS causes only weak red blood cell (RBC) hemolysis in vitro and neither confers resistance to phagocytic killing nor favors survival of L...
April 4, 2017: MBio
https://www.readbyqxmd.com/read/28376880/a-review-on-lactococcus-lactis-from-food-to-factory
#20
REVIEW
Adelene Ai-Lian Song, Lionel L A In, Swee Hua Erin Lim, Raha Abdul Rahim
Lactococcus lactis has progressed a long way since its discovery and initial use in dairy product fermentation, to its present biotechnological applications in genetic engineering for the production of various recombinant proteins and metabolites that transcends the heterologous species barrier. Key desirable features of this gram-positive lactic acid non-colonizing gut bacteria include its generally recognized as safe (GRAS) status, probiotic properties, the absence of inclusion bodies and endotoxins, surface display and extracellular secretion technology, and a diverse selection of cloning and inducible expression vectors...
April 4, 2017: Microbial Cell Factories
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