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Microbiome infections

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https://www.readbyqxmd.com/read/28431238/reducing-recurrence-of-c-difficile-infection
#1
Michael G Dieterle, Vincent B Young
Clostridium difficile infection (CDI) is facilitated by alteration of the microbiome following antibiotic administration. Antimicrobial therapy directed against the pathogen can treat CDI. Unfortunately, ∼20% of successfully treated patients will suffer recurrence. Bezlotoxumab, a human monoclonal antibody, binds to C. difficile toxin B (TcdB), reducing recurrence presumably by limiting epithelial damage and facilitating microbiome recovery.
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28429823/changes-in-the-gut-microbiome-of-the-chinese-mitten-crab-eriocheir-sinensis-in-response-to-white-spot-syndrome-virus-wssv-infection
#2
Z F Ding, M J Cao, X S Zhu, G H Xu, R L Wang
Intestinal microorganisms play important roles in maintaining host health, but their functions in aquatic animal hosts have yet to be fully elucidated. The Chinese mitten crab, Eriocheir sinensis, is one such example. We attempted to identify the shift of gut microbiota that occurred in response to infection of white spot syndrome virus (WSSV), an emerging viral pathogen in the crab aquaculture industry. The microbiota may exert some control over aspects of the viral pathogenesis. We investigated the changes in composition and structure of the crab gut microbiome during various WSSV infection stages of 6 h post-infection (hpi) and 48 hpi, using a 16S rRNA approach on the MiSeq Illumina sequencing platform...
April 21, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28427967/mechanisms-underlying-hiv-associated-non-infectious-lung-disease
#3
REVIEW
Rachel M Presti, Sonia C Flores, Brent E Palmer, Jeffrey J Atkinson, Catherine R Lesko, Bryan Lau, Andrew P Fontenot, Jesse Roman, John F McDyer, Homer L Twigg
Pulmonary disease remains a primary source of morbidity and mortality in persons living with HIV (PLWH), although the advent of potent combination antiretroviral therapy (cART) has resulted in a shift from predominantly infectious to noninfectious pulmonary complications. PLWH are at high risk for chronic obstructive pulmonary disease, pulmonary hypertension, and lung cancer even in the era of cART. The underlying mechanisms of this are incompletely understood, but recent research in both human and animal models suggest that oxidative stress, expression of matrix metalloproteinases, and genetic instability may result in lung damage which predisposes PLWH to these conditions...
April 17, 2017: Chest
https://www.readbyqxmd.com/read/28425465/chytrid-fungus-infection-in-zebrafish-demonstrates-that-the-pathogen-can-parasitize-non-amphibian-vertebrate-hosts
#4
Nicole Liew, Maria J Mazon Moya, Claudia J Wierzbicki, Michael Hollinshead, Michael J Dillon, Christopher R Thornton, Amy Ellison, Jo Cable, Matthew C Fisher, Serge Mostowy
Aquatic chytrid fungi threaten amphibian biodiversity worldwide owing to their ability to rapidly expand their geographical distributions and to infect a wide range of hosts. Combating this risk requires an understanding of chytrid host range to identify potential reservoirs of infection and to safeguard uninfected regions through enhanced biosecurity. Here we extend our knowledge on the host range of the chytrid Batrachochytrium dendrobatidis by demonstrating infection of a non-amphibian vertebrate host, the zebrafish...
April 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28423869/protective-effects-of-bacillus-subtilis-against-salmonella-infection-in-the-microbiome-of-hy-line-brown-layers
#5
Ju Kyoung Oh, Edward Alain B Pajarillo, Jong Pyo Chae, In Ho Kim, D-K Kang
Objective: This study investigated the effects of Bacillus subtilis CSL2 administration before Salmonella challenge on the fecal microbiota and microbial functionality of Hy-line Brown (HLB) laying hens. Methods: Fecal samples were collected from control (CON), Salmonella-infected (SAL) and Salmonella-infected, probiotic-treated (PRO) groups before and after Salmonella challenge for microbiome analysis using 16S rRNA gene pyrosequencing. Results: Infection with Salmonella led to decreased microbial diversity in hen feces; diversity was recovered with Bacillus administration...
April 19, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28421185/changes-in-composition-of-the-gut-bacterial-microbiome-after-fecal-microbiota-transplantation-for-recurrent-clostridium-difficile-infection-in-a-pediatric-heart-transplant-patient
#6
Kyle L Flannigan, Taylor Rajbar, Andrew Moffat, Leanna S McKenzie, Frank Dicke, Kevin Rioux, Matthew L Workentine, Thomas J Louie, Simon A Hirota, Steven C Greenway
The microbiome is increasingly recognized as an important influence on human health and many of the comorbidities that affect patients after solid organ transplantation (SOT) have been shown to involve changes in gut bacterial populations. Thus, microbiome changes in an individual patient may have important health implications after SOT but this area remains understudied. We describe changes in the composition of the fecal microbiome from a pediatric heart transplant recipient before and >2.5 years after he underwent repeated fecal microbiota transplantation (FMT) for recurrent Clostridium difficile infection (CDI)...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28421042/mosquito-microbiome-dynamics-a-background-for-prevalence-and-seasonality-of-west-nile-virus
#7
Eva Novakova, Douglas C Woodhams, Sonia M Rodríguez-Ruano, Robert M Brucker, Jonathan W Leff, Amin Maharaj, Amnon Amir, Rob Knight, James Scott
Symbiotic microbial communities augment host phenotype, including defense against pathogen carriage and infection. We sampled the microbial communities in 11 adult mosquito host species from six regions in southern Ontario, Canada over 3 years. Of the factors examined, we found that mosquito species was the largest driver of the microbiota, with remarkable phylosymbiosis between host and microbiota. Seasonal shifts of the microbiome were consistently repeated over the 3-year period, while region had little impact...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28419766/microbial-community-function-in-the-bleaching-disease-of-the-marine-macroalgae-delisea-pulchra
#8
Enrique Zozaya-Valdés, Alexandra J Roth-Schulze, Suhelen Egan, Torsten Thomas
Disease is increasingly viewed as a major factor impacting the health of both natural and cultured populations of marine organisms, including macroalgae. The red macroalga Delisea pulchra suffers from a bleaching disease resulting from host stress and infection by opportunistic bacterial pathogens. However how pathogens cause the disease and how the entire algal-associated community is involved in the process is unclear. Here we perform a metagenomic analysis of microbial communities associated with diseased and healthy D...
April 17, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28418713/defence-factors-of-vaginal-lactobacilli
#9
S Kovachev
Accurate knowledge of the composition and ecology of the vaginal microbial environment in healthy women is necessary for understanding lactobacilli-dominated normal microbiota and the mechanisms by which it reduces disease risk. The vagina and its microbiota form a balanced ecosystem; any movement outside the normal range for this ecosystem of obligate and/or facultative microbes, termed dysbacteriosis, can lead to infection and disease. This review summarizes recent research on the vaginal ecosystem, the Lactobacillus species that dominate it, and the means by which they suppress the growth, development, and/or proliferation of pathogenic microbial species...
April 18, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28412525/liver-microbiome-of-peromyscus-leucopus-a-key-reservoir-host-species-for-emerging-infectious-diseases-in-north-america
#10
A André, A Mouton, V Millien, J Michaux
Microbiome studies generally focus on the gut microbiome, which is composed of a large proportion of commensal bacteria. Here we propose a first analysis of the liver microbiome using next generation sequencing as a tool to detect potentially pathogenic strains. We used Peromyscus leucopus, the main reservoir host species of Lyme disease in eastern North America, as a model and sequenced V5-V6 regions of the 16S gene from 18 populations in southern Quebec (Canada). The Lactobacillus genus was found to dominate the liver microbiome...
April 12, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28408748/the-microbiome-of-the-lung-and-its-extracellular-vesicles-in-nonsmokers-healthy-smokers-and-copd-patients
#11
Hyun Jung Kim, You-Sun Kim, Kang-Hyun Kim, Jun-Pyo Choi, Yoon-Keun Kim, Sunmi Yun, Lokesh Sharma, Charles S Dela Cruz, Jae Seung Lee, Yeon-Mok Oh, Sang-Do Lee, Sei Won Lee
Chronic obstructive pulmonary disease (COPD) is a chronic inflammatory disease, and bacterial infection plays a role in its pathogenesis. Bacteria secrete nanometer-sized extracellular vesicles (EVs), which may induce more immune dysfunction and inflammation than the bacteria themselves. We hypothesized that the microbiome of lung EVs might have distinct characteristics depending on the presence of COPD and smoking status. We analyzed and compared the microbiomes of 13 nonsmokers with normal spirometry, 13 smokers with normal spirometry (healthy smokers) and 13 patients with COPD by using 16S ribosomal RNA gene sequencing of surgical lung tissue and lung EVs...
April 14, 2017: Experimental & Molecular Medicine
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/28397879/intestinal-microbiome-in-children-with-severe-and-complicated-acute-viral-gastroenteritis
#13
Shih-Yen Chen, Chi-Neu Tsai, Yun-Shien Lee, Chun-Yuan Lin, Kuan-Yeh Huang, Hsun-Ching Chao, Ming-Wei Lai, Cheng-Hsun Chiu
The aim of the present study was to evaluate the microbiota of children with severe or complicated acute viral gastroenteritis (AGE). To that end, next-generation sequencing (NGS) technology was used to sequence the 16S ribosomal RNA (16S rRNA) gene in 20 hospitalized pediatric patients with severe or complicated AGE and a further 20 otherwise healthy children; the fecal microbiome was then assessed. Comparative metagenomics data were analyzed by a Wilcoxon rank-sum test and hierarchical clustering analysis of bacterial reads...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28397557/factors-associated-with-infectious-laryngitis-a-retrospective-review-of-15-cases
#14
Carissa M Thomas, Marie E Jetté, Matthew S Clary
OBJECTIVES: To identify the culturable microbes associated with infectious laryngitis and outline effective treatment strategies. METHODS: This is a retrospective chart review of adult patients with persistent dysphonia plus evidence of laryngeal inflammation who underwent biopsy for culture at a tertiary care medical center. Demographic factors, symptoms as reported on validated patient assessment tools, past medical history, social history, culture results, and treatment duration and response were reviewed...
May 2017: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/28396417/enterococcus-faecalis-bacteriocin-entv-inhibits-hyphal-morphogenesis-biofilm-formation-and-virulence-of-candida-albicans
#15
Carrie E Graham, Melissa R Cruz, Danielle A Garsin, Michael C Lorenz
Enterococcus faecalis, a Gram-positive bacterium, and Candida albicans, a fungus, occupy overlapping niches as ubiquitous constituents of the gastrointestinal and oral microbiome. Both species also are among the most important and problematic, opportunistic nosocomial pathogens. Surprisingly, these two species antagonize each other's virulence in both nematode infection and in vitro biofilm models. We report here the identification of the E. faecalis bacteriocin, EntV, produced from the entV (ef1097) locus, as both necessary and sufficient for the reduction of C...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28392784/structure-and-function-of-the-fecal-microbiota-in-diarrheic-neonatal-piglets
#16
Qiaoli Yang, Xiaoyu Huang, Shengguo Zhao, Wenyang Sun, Zunqiang Yan, Pengfei Wang, Shenggui Li, Wangzhou Huang, Shengwei Zhang, Lixia Liu, Shuangbao Gun
Diarrhea is a leading cause of increased mortality in neonatal and young piglets. Aberration of the gut microbiota is one important factor in the etiology of piglet diarrhea. However, information regarding the structure and function of the gut microbiome in diarrheic neonatal piglets is limited. To investigate the composition and functional potential of the fecal microbiota in neonatal piglets, we performed 16S rRNA gene sequencing on 20 fecal samples from diarrheic piglets and healthy controls, and metagenomics sequencing on a subset of six samples...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28392403/matrix-metalloproteinases-outside-vertebrates
#17
Laura Marino-Puertas, Theodoros Goulas, F Xavier Gomis-Rüth
The matrix metalloproteinase (MMP) family belongs to the metzincin clan of zinc-dependent metallopeptidases. Due to their enormous implications in physiology and disease, MMPs have mainly been studied in vertebrates. They are engaged in extracellular protein processing and degradation, and present extensive paralogy, with 23 forms in humans. One characteristic of MMPs is a~165-residue catalytic domain (CD), which has been structurally studied for 14 MMPs from human, mouse, rat, pig and the oral-microbiome bacterium Tannerella forsythia...
April 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28386263/adaptive-immunity-is-the-key-to-the-understanding-of-autoimmune-and-paraneoplastic-inflammatory-central-nervous-system-disorders
#18
REVIEW
Robert Weissert
There are common aspects and mechanisms between different types of autoimmune diseases such as multiple sclerosis (MS), neuromyelitis optica spectrum disorders (NMOSDs), and autoimmune encephalitis (AE) as well as paraneoplastic inflammatory disorders of the central nervous system. To our present knowledge, depending on the disease, T and B cells as well as antibodies contribute to various aspects of the pathogenesis. Possibly the events leading to the breaking of tolerance between the different diseases are of great similarity and so far, only partially understood...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28386215/microbial-immuno-communication-in-neurodegenerative-diseases
#19
REVIEW
Bevan S Main, Myles R Minter
Neuro-inflammation is a critical process by which the brain coordinates chemokine-regulated cellular recruitment, cytokine release, and cell-mediated removal of pathogenic material to protect against infection or brain injury. Dysregulation of this immune response is involved in multiple neurodegenerative disorders, however the precise contribution of neuro-inflammation to the exacerbation and progression of these diseases remains unclear. Evidence now suggests that commensal micro-organisms populating the host and their metabolites, collectively termed the microbiome, regulate innate immunity by influencing peripheral immune cell populations, and modulating microglial phenotype...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28379372/the-microbiological-landscape-of-anaerobic-infections-in-hidradenitis-suppurativa-a-prospective-metagenomic-study
#20
Hélène Guet-Revillet, Jean-Philippe Jais, Marie-Noelle Ungeheuer, Hélène Coignard-Biehler, Sabine Duchatelet, Maïa Delage, Thi Lam, Alain Hovnanian, Olivier Lortholary, Xavier Nassif, Aude Nassif, Olivier Join-Lambert
Background.: Hidradenitis suppurativa (HS) is a frequent and severe disease of the skin, characterized by recurrent or chronic skinfolds suppurative lesions with a high impact on quality of life. Although considered inflammatory, antimicrobial treatments can improve or lead to clinical remission of HS, suggesting triggering microbial factors. Indeed, mixed anaerobic microbiota are associated with a majority of HS lesions. The aim of this study was to characterize the landscape of anaerobic infections in HS using high throughput sequencing...
April 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
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