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Dysbiosis

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https://www.readbyqxmd.com/read/28210249/feeding-a-high-concentration-diet-induces-unhealthy-alterations-in-the-composition-and-metabolism-of-ruminal-microbiota-and-host-response-in-a-goat-model
#1
Canfeng Hua, Jing Tian, Ping Tian, Rihua Cong, Yanwen Luo, Yali Geng, Shiyu Tao, Yingdong Ni, Ruqian Zhao
There is limited knowledge about the impact of long-term feeding a high-concentrate (HC) diet on rumen microbiota, metabolome, and host cell functions. In this study, a combination of mass spectrometry-based metabolomics techniques, 454 pyrosequencing of 16S rDNA genes, and RT-PCR was applied to evaluate the changes of ruminal microbiota composition, ruminal metabolites, and related genes expression in rumen epithelial cells of lactating goats received either a 35% concentrate diet or a 65% concentrate diet for 4 or 19 weeks, respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28207943/the-role-of-the-skin-microbiome-in-atopic-dermatitis-a-systematic-review
#2
REVIEW
R Dybboe, J Bandier, L Skov, L Engstrand, J D Johansen
BACKGROUND: Dysbiosis is a hallmark of atopic dermatitis. The composition of skin microbiome communities and the causality of dysbiosis in eczema have not been well established. OBJECTIVE: To describe the skin microbiome profile in atopic dermatitis and address if there is a causal relationship between dysbiosis and atopic dermatitis. METHODS: The protocol is registered in PROSPERO (CRD42016035813). We searched PubMed, Embase, Scopus and ClinicalTrials...
February 16, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28204873/dysbiosis-a-risk-factor-for-celiac-disease
#3
REVIEW
Anamaria Girbovan, Genel Sur, Gabriel Samasca, Iulia Lupan
Celiac disease remains one of the most challenging pathologies of the small intestine. It involves multiple pathogenic pathways and there are no disease-changing pharmacological agents available against it yet. The term microbiota refers to the community of microorganisms that inhabit a particular region of the body. Normal gut microbiota has a vital role in maintaining the intestinal homeostasis and promoting health. Celiac disease is associated with microbiota alteration, especially with an increase in the number of Gram-negative bacteria and a decrease in the number of Gram-positive bacteria...
February 15, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/28202372/gut-microbiota-implications-in-parkinson-s-disease
#4
REVIEW
Arun Parashar, Malairaman Udayabanu
Gut microbiota (GM) can influence various neurological outcomes, like cognition, learning, and memory. Commensal GM modulates brain development and behavior and has been implicated in several neurological disorders like Alzheimer's disease, multiple sclerosis, amyotrophic lateral sclerosis, anxiety, stress and much more. A recent study has shown that Parkinson's disease patients suffer from GM dysbiosis, but whether it is a cause or an effect is yet to be understood. In this review, we try to connect the dots between GM and PD pathology using direct and indirect evidence...
February 7, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28199766/dysbiosis-of-oral-buccal-mucosa-microbiota-in-patients-with-oral-lichen-planus
#5
Yuan He, Diping Gong, Cong Shi, Fangyang Shao, Jiahao Shi, Jian Fei
OBJECTIVE: The bacterial community structure of buccal mucosa in patients with oral lichen planus was evaluated and compared with healthy control. SUBJECTS AND METHODS: Buccal scraping samples have been taken on 43 oral lichen planus patients (21 erosive and 22 non-erosive) and 21 mucosal healthy volunteers. The V3 hypervariable 16S rDNA region were amplified and sequenced by high-throughput 454 pyrosequencing. RESULTS: 94.26% of the total buccal bacteria were classified into 15 abundant genera...
February 15, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28199741/melatonin-prevents-obesity-through-modulation-of-gut-microbiota-in-mice
#6
Pengfei Xu, Jialin Wang, Fan Hong, Sheng Wang, Xi Jin, Tingting Xue, Li Jia, Yonggong Zhai
Excess weight and obesity are severe public health threats worldwide. Recent evidence demonstrates that gut microbiota dysbiosis contributes to obesity and its comorbidities. The body weight-reducing and energy balancing effects of melatonin have been reported in several studies, but to date, no investigations toward examining whether the beneficial effects of melatonin are associated with gut microbiota have been carried out. In this study, we show that melatonin reduces body weight, liver steatosis, and low-grade inflammation as well as improving insulin resistance in high fat diet (HFD)-fed mice...
February 15, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28198672/integrated-metagenomic-data-analysis-demonstrates-that-a-loss-of-diversity-in-oral-microbiota-is-associated-with-periodontitis
#7
Dongmei Ai, Ruocheng Huang, Jin Wen, Chao Li, Jiangping Zhu, Li Charlie Xia
BACKGROUND: Periodontitis is an inflammatory disease affecting the tissues supporting teeth (periodontium). Integrative analysis of metagenomic samples from multiple periodontitis studies is a powerful way to examine microbiota diversity and interactions within host oral cavity. METHODS: A total of 43 subjects were recruited to participate in two previous studies profiling the microbial community of human subgingival plaque samples using shotgun metagenomic sequencing...
January 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28197729/gardnerella-vaginalis-population-dynamics-in-bacterial-vaginosis
#8
D W Hilbert, J A Schuyler, M E Adelson, E Mordechai, J D Sobel, S E Gygax
Bacterial vaginosis (BV) is the leading cause of vaginal discharge and is associated with the facultative Gram-variable bacterium Gardnerella vaginalis, whose population structure consists of four clades. Our goal was to determine if these clades differ with regard to abundance during BV. We performed a short-term longitudinal study of BV. Patients were evaluated according to the Amsel criteria and Nugent scoring at initial diagnosis, immediately after treatment and at a 40- to 45-day follow-up visit. G. vaginalis clade abundance was determined by quantitative real-time polymerase chain reactions (qPCRs)...
February 14, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28196869/structural-insights-unravel-the-zymogenic-mechanism-of-the-virulence-factor-gingipain-k-from-porphyromonas-gingivalis-a-causative-agent-of-gum-disease-from-the-human-oral-microbiome
#9
Anja Pomowski, Isabel Uson, Zuzanna M Nowakowska, Florian Veillard, Maryta N Sztukowska, Tibisay Guevara, Theodoros Goulas, Danuta Mizgalska, Magdalena L Nowak, Barbara A Potempa, James A Huntington, Jan Potempa, F Xavier Gomis-Ruth
Skewing of the human oral microbiome causes dysbiosis and preponderance of bacteria such as Porphyromonas gingivalis, the main etiological agent of periodontitis. P. gingivalis secretes proteolytic gingipains (Kgp and RgpA/B) as zymogens inhibited by a pro-domain that is removed during extracellular activation. Unraveling the molecular mechanism of Kgp zymogenicity is essential to design inhibitors blocking its activity. Here, we found that the isolated 209-residue Kgp pro-domain is a boomerang-shaped all-β protein similar to the RgpB pro-domain...
February 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28195358/parkinson-s-disease-and-parkinson-s-disease-medications-have-distinct-signatures-of-the-gut-microbiome
#10
Erin M Hill-Burns, Justine W Debelius, James T Morton, William T Wissemann, Matthew R Lewis, Zachary D Wallen, Shyamal D Peddada, Stewart A Factor, Eric Molho, Cyrus P Zabetian, Rob Knight, Haydeh Payami
BACKGROUND: There is mounting evidence for a connection between the gut and Parkinson's disease (PD). Dysbiosis of gut microbiota could explain several features of PD. OBJECTIVE: The objective of this study was to determine if PD involves dysbiosis of gut microbiome, disentangle effects of confounders, and identify candidate taxa and functional pathways to guide research. METHODS: A total of 197 PD cases and 130 controls were studied. Microbial composition was determined by 16S rRNA gene sequencing of DNA extracted from stool...
February 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28195066/successful-therapy-of-clostridium-difficile-infection-with-fecal-microbiota-transplantation
#11
P C Konturek, J Koziel, W Dieterich, D Haziri, S Wirtz, I Glowczyk, K Konturek, M F Neurath, Y Zopf
Clostridium difficile infection (CDI) is the most common cause of infectious diarrhea and represents an important burden for healthcare worldwide. Symptoms of severe CDI include watery, foul-smelling diarrhea, peripheral leucocytosis, increased C-reactive protein (CRP), acute renal failure, hypotension and pseudomembranous colitis. Recent studies indicate that the main cause of CDI is dysbiosis, an imbalance in the normal gut microbiota. The restoration of a healthy gut microbiota composition via fecal microbiota transplantation (FMT) recently became more popular...
December 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28194099/gut-to-brain-dysbiosis-mechanisms-linking-western-diet-consumption-the-microbiome-and-cognitive-impairment
#12
REVIEW
Emily E Noble, Ted M Hsu, Scott E Kanoski
Consumption of a Western Diet (WD) that is high in saturated fat and added sugars negatively impacts cognitive function, particularly mnemonic processes that rely on the integrity of the hippocampus. Emerging evidence suggests that the gut microbiome influences cognitive function via the gut-brain axis, and that WD factors significantly alter the proportions of commensal bacteria in the gastrointestinal tract. Here we review mechanisms through which consuming a WD negatively impacts neurocognitive function, with a particular focus on recent evidence linking the gut microbiome with dietary- and metabolic-associated hippocampal impairment...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28191884/dynamics-of-the-human-gut-microbiome-in-inflammatory-bowel-disease
#13
Jonas Halfvarson, Colin J Brislawn, Regina Lamendella, Yoshiki Vázquez-Baeza, William A Walters, Lisa M Bramer, Mauro D'Amato, Ferdinando Bonfiglio, Daniel McDonald, Antonio Gonzalez, Erin E McClure, Mitchell F Dunklebarger, Rob Knight, Janet K Jansson
Inflammatory bowel disease (IBD) is characterized by flares of inflammation with a periodic need for increased medication and sometimes even surgery. The aetiology of IBD is partly attributed to a deregulated immune response to gut microbiome dysbiosis. Cross-sectional studies have revealed microbial signatures for different IBD subtypes, including ulcerative colitis, colonic Crohn's disease and ileal Crohn's disease. Although IBD is dynamic, microbiome studies have primarily focused on single time points or a few individuals...
February 13, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28187526/secondary-bile-acid-induced-dysbiosis-promotes-intestinal-carcinogenesis
#14
Hailong Cao, Mengque Xu, Wenxiao Dong, Baoru Deng, Sinan Wang, Yujie Zhang, Shan Wang, Shenhui Luo, Weiqiang Wang, Yanrong Qi, Jianxin Gao, Xiaocang Cao, Fang Yan, Bangmao Wang
The gut microbiota plays an important role in maintaining intestinal homeostasis. Dysbiosis is associated with intestinal tumorigenesis. Deoxycholic acid (DCA), a secondary bile acid increased by a western diet, is associated with intestinal carcinogenesis. However, evidence relating bile acids, intestinal microbiota and tumorigenesis is limited. In this study, we investigated the effect of DCA on induction of intestinal dysbiosis and its roles in intestinal carcinogenesis. Alteration of the composition of the intestinal microbiota was induced in DCA-treated mice, which was accompanied by impaired intestinal barrier, gut low grade inflammation and tumor progression...
February 10, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28182951/microbial-respiration-and-formate-oxidation-as-metabolic-signatures-of-inflammation-associated-dysbiosis
#15
Elizabeth R Hughes, Maria G Winter, Breck A Duerkop, Luisella Spiga, Tatiane Furtado de Carvalho, Wenhan Zhu, Caroline C Gillis, Lisa Büttner, Madeline P Smoot, Cassie L Behrendt, Sara Cherry, Renato L Santos, Lora V Hooper, Sebastian E Winter
Intestinal inflammation is frequently associated with an alteration of the gut microbiota, termed dysbiosis, which is characterized by a reduced abundance of obligate anaerobic bacteria and an expansion of facultative Proteobacteria such as commensal E. coli. The mechanisms enabling the outgrowth of Proteobacteria during inflammation are incompletely understood. Metagenomic sequencing revealed bacterial formate oxidation and aerobic respiration to be overrepresented metabolic pathways in a chemically induced murine model of colitis...
February 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28182098/antioxidant-immunomodulating-and-microbial-modulating-activities-of-the-sustainable-and-ecofriendly-spirulina
#16
REVIEW
Alberto Finamore, Maura Palmery, Sarra Bensehaila, Ilaria Peluso
The highly nutritional and ecofriendly Spirulina (Arthrospira platensis) has hypolipidemic, hypoglycemic, and antihypertensive properties. Spirulina contains functional compounds, such as phenolics, phycocyanins, and polysaccharides, with antioxidant, anti-inflammatory, and immunostimulating effects. Studies conducted on Spirulina suggest that it is safe in healthy subjects, but attitude to eating probably affects the acceptability of Spirulina containing foods. Although the antioxidant effect of Spirulina is confirmed by the intervention studies, the concerted modulation of antioxidant and inflammatory responses, suggested by in vitro and animal studies, requires more confirmation in humans...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28180212/kodo-millet-whole-grain-and-bran-supplementation-prevents-high-fat-diet-induced-derangements-in-a-lipid-profile-inflammatory-status-and-gut-bacteria-in-mice
#17
Siddhartha M Sarma, Pragyanshu Khare, Sneha Jagtap, Dhirendra P Singh, Ritesh K Baboota, Koteswaraiah Podili, Ravneet K Boparai, Jaspreet Kaur, Kamlesh K Bhutani, Mahendra Bishnoi, Kanthi Kiran Kondepudi
The protective role of kodo millet whole grain and bran supplementation in diet induced obesity has not been investigated. Here we have studied the role of kodo millet supplementation in age matched Swiss albino mice that were randomly divided into groups and fed their respective diets for 16 weeks. A high fat diet increased weight gain, reduced glucose tolerance, increased serum lipids, altered hepatic and adipocyte gene expression and caused dysbiosis in the intestinal beneficial bacteria. Kodo millet supplementation did not affect weight gain but it improved glucose tolerance and prevented an increase in the serum cholesterol and lipid parameters (P ≤ 0...
February 9, 2017: Food & Function
https://www.readbyqxmd.com/read/28179361/a-microbial-signature-for-crohn-s-disease
#18
Victoria Pascal, Marta Pozuelo, Natalia Borruel, Francesc Casellas, David Campos, Alba Santiago, Xavier Martinez, Encarna Varela, Guillaume Sarrabayrouse, Kathleen Machiels, Severine Vermeire, Harry Sokol, Francisco Guarner, Chaysavanh Manichanh
OBJECTIVE: A decade of microbiome studies has linked IBD to an alteration in the gut microbial community of genetically predisposed subjects. However, existing profiles of gut microbiome dysbiosis in adult IBD patients are inconsistent among published studies, and did not allow the identification of microbial signatures for CD and UC. Here, we aimed to compare the faecal microbiome of CD with patients having UC and with non-IBD subjects in a longitudinal study. DESIGN: We analysed a cohort of 2045 non-IBD and IBD faecal samples from four countries (Spain, Belgium, the UK and Germany), applied a 16S rRNA sequencing approach and analysed a total dataset of 115 million sequences...
February 7, 2017: Gut
https://www.readbyqxmd.com/read/28175270/p776-dysbiosis-in-nlrp6-asc-deficient-mice-does-not-result-from-inflammasome-deficiency
#19
M Mamantopoulos, F Ronchi, F Van Hauwermeiren, S Vieira-Silva, B Yilmaz, L Martens, Y Saeys, S Drexler, A Yazdi, J Raes, M Lamkanfi, K McCoy, A Wullaert
No abstract text is available yet for this article.
February 1, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28174747/a-disease-associated-microbial-and-metabolomics-state-in-relatives-of-pediatric-inflammatory-bowel-disease-patients
#20
Jonathan P Jacobs, Maryam Goudarzi, Namita Singh, Maomeng Tong, Ian H McHardy, Paul Ruegger, Miro Asadourian, Bo-Hyun Moon, Allyson Ayson, James Borneman, Dermot P B McGovern, Albert J Fornace, Jonathan Braun, Marla Dubinsky
BACKGROUND & AIMS: Microbes may increase susceptibility to inflammatory bowel disease (IBD) by producing bioactive metabolites that affect immune activity and epithelial function. We undertook a family based study to identify microbial and metabolic features of IBD that may represent a predisease risk state when found in healthy first-degree relatives. METHODS: Twenty-one families with pediatric IBD were recruited, comprising 26 Crohn's disease patients in clinical remission, 10 ulcerative colitis patients in clinical remission, and 54 healthy siblings/parents...
November 2016: Cellular and Molecular Gastroenterology and Hepatology
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