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Obesity and Microbiome

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https://www.readbyqxmd.com/read/29341867/genetic-and-microbiome-influence-on-lipid-metabolism-and-dyslipidemia
#1
Maria Matey Hernandez, Frances Mk Mk Williams, Tilly Potter, Ana M Valdes, Tim Spector, Cristina Menni
Disruption in the metabolism of lipids is broadly classified under dyslipidemias and relate to the concentration of lipids in the blood. Dyslipidemia is a predictor of cardio-metabolic disease including obesity. Traditionally, the large inter-individual variation has been related to genetic factors and diet. Genome-wide association studies have identified over 150 loci related to abnormal lipid levels, explaining approximately 40% of the total variation. Part of the unexplained variance has been attributed to environmental factors including diet, but the extent of the dietary contribution remains unquantified...
December 20, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/29341448/beneficial-actions-of-microbiota-derived-tryptophan-metabolites
#2
REVIEW
J J Galligan
Tryptophan is an important dietary amino acid and it is the precursor for 5-hydroxytryptamine synthesis in the nervous system and by enterochromaffin cells in the gut mucosa. Tryptophan is also metabolized by enzymes in the gut mucosa and also by enzymes produced by the gut microbiome. Diet and the microbiome can contribute to metabolic disease in part by causing intestinal inflammation and increased permeability. In this issue of Neurogastroenterology and Motility, Jennis et al. test the hypothesis that indole tryptophan metabolites produced by gut bacteria might be responsible for the anti-inflammatory and beneficial metabolic effects of the gut microbiome and Roux-en-Y gastric bypass surgery for weight loss by obese patients...
February 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/29339445/bile-acids-in-glucose-metabolism-in-health-and-disease
#3
REVIEW
Hagit Shapiro, Aleksandra A Kolodziejczyk, Daniel Halstuch, Eran Elinav
Bile acids (BAs) are cholesterol-derived metabolites that facilitate the intestinal absorption and transport of dietary lipids. Recently, BAs also emerged as pivotal signaling molecules controlling glucose, lipid, and energy metabolism by binding to the nuclear hormone farnesoid X receptor (FXR) and Takeda G protein receptor 5 (TGR5) in multiple organs, leading to regulation of intestinal incretin secretion, hepatic gluconeogenesis, glycogen synthesis, energy expenditure, inflammation, and gut microbiome configuration...
January 16, 2018: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29333111/diet-gut-microbiota-and-colorectal-cancer-prevention-a-review-of-potential-mechanisms-and-promising-targets-for-future-research
#4
Mingyang Song, Andrew T Chan
Diet plays an important role in the development of colorectal cancer. Emerging data have implicated the gut microbiota in colorectal cancer. Diet is a major determinant for the gut microbial structure and function. Therefore, it has been hypothesized that alterations in gut microbes and their metabolites may contribute to the influence of diet on the development of colorectal cancer. We review several major dietary factors that have been linked to gut microbiota and colorectal cancer, including major dietary patterns, fiber, red meat and sulfur, and obesity...
December 2017: Current Colorectal Cancer Reports
https://www.readbyqxmd.com/read/29325602/bile-acid-metabolism-in-liver-pathobiology
#5
John Y L Chiang, Jessica M Ferrell
Bile acids facilitate intestinal nutrient absorption and biliary cholesterol secretion to maintain bile acid homeostasis, which is essential for protecting liver and other tissues and cells from cholesterol and bile acid toxicity. Bile acid metabolism is tightly regulated by bile acid synthesis in the liver and bile acid biotransformation in the intestine. Bile acids are endogenous ligands that activate a complex network of nuclear receptor farnesoid X receptor and membrane G protein-coupled bile acid receptor-1 to regulate hepatic lipid and glucose metabolic homeostasis and energy metabolism...
January 11, 2018: Gene Expression
https://www.readbyqxmd.com/read/29316320/human-microbiota-blood-group-antigens-and-disease
#6
REVIEW
D Rose Ewald, Susan C J Sumner
Far from being just "bugs in our guts," the microbiota interacts with the body in previously unimagined ways. Research into the genome and the microbiome has revealed that the human body and the microbiota have a long-established but only recently recognized symbiotic relationship; homeostatic balance between them regulates body function. That balance is fragile, easily disturbed, and plays a fundamental role in human health-our very survival depends on the healthy functioning of these microorganisms. Increasing rates of cardiovascular, autoimmune, and inflammatory diseases, as well as epidemics in obesity and diabetes in recent decades are believed to be explained, in part, by unintended effects on the microbiota from vaccinations, poor diets, environmental chemicals, indiscriminate antibiotic use, and "germophobia...
January 9, 2018: Wiley Interdisciplinary Reviews. Systems Biology and Medicine
https://www.readbyqxmd.com/read/29260181/reshaped-fecal-gut-microbiota-composition-by-the-intake-of-high-molecular-weight-persimmon-tannin-in-normal-and-high-cholesterol-diet-fed-rats
#7
Wei Zhu, Kuan Lin, Kaikai Li, Xiangyi Deng, Chunmei Li
It has been proposed that the gut microbiome may be related to obesity, and diet-induced obesity may induce changes in the gut microbiota composition. Our previous studies suggested that persimmon tannin (PT), which is highly polymerized and non-absorbable in the intestine, showed anti-hyperlipidemic and cholesterol-lowering effects in animal models. Considering that the possible composition modification effects of PT on intestinal bacteria might contribute to its anti-hyperlipidemic and cholesterol-lowering effects in vivo, in this study, we determined whether the PT administration could modify the gut microbiota in both normal diet-fed and high-cholesterol (HC) diet-fed rats, and how PT altered the bacterial composition in both normal and HC fed rats...
December 20, 2017: Food & Function
https://www.readbyqxmd.com/read/29259973/mediterranean-diet-prevention-of-colorectal-cancer
#8
REVIEW
Micah G Donovan, Ornella I Selmin, Tom C Doetschman, Donato F Romagnolo
Colorectal cancer (CRC) is the third most common cancer diagnosis and the second and third leading cause of cancer mortality in men and women, respectively. However, the majority of CRC cases are the result of sporadic tumorigenesis via the adenoma-carcinoma sequence. This process can take up to 20 years, suggesting an important window of opportunity exists for prevention such as switching toward healthier dietary patterns. The Mediterranean diet (MD) is a dietary pattern associated with various health benefits including protection against cardiovascular disease, diabetes, obesity, and various cancers...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/29241453/bile-acid-is-a-significant-host-factor-shaping-the-gut-microbiome-of-diet-induced-obese-mice
#9
Xiaojiao Zheng, Fengjie Huang, Aihua Zhao, Sha Lei, Yunjing Zhang, Guoxiang Xie, Tianlu Chen, Chun Qu, Cynthia Rajani, Bing Dong, Defa Li, Wei Jia
BACKGROUND: Intestinal bacteria are known to regulate bile acid (BA) homeostasis via intestinal biotransformation of BAs and stimulation of the expression of fibroblast growth factor 19 through intestinal nuclear farnesoid X receptor (FXR). On the other hand, BAs directly regulate the gut microbiota with their strong antimicrobial activities. It remains unclear, however, how mammalian BAs cross-talk with gut microbiome and shape microbial composition in a dynamic and interactive way. RESULTS: We quantitatively profiled small molecule metabolites derived from host-microbial co-metabolism in mice, demonstrating that BAs were the most significant factor correlated with microbial alterations among all types of endogenous metabolites...
December 14, 2017: BMC Biology
https://www.readbyqxmd.com/read/29241213/antibiotics-induced-obesity-a-mitochondrial-perspective
#10
Melisa J Andrade, Chinchu Jayaprakash, Smitha Bhat, Nikolaos Evangelatos, Angela Brand, Kapaettu Satyamoorthy
Antibiotics are the first line of treatment against infections and have contributed immensely to reduce the morbidity and mortality rates. Recently, extensive use of antibiotics has led to alterations of the gut microbiome, predisposition to various diseases and most importantly, increase in the emergence of antibiotic-resistant bacteria, which poses a major threat to global public health. Another major issue faced worldwide due to unregulated use of antibiotics in children as well as in adults is the influence of metabolism and body weight homeostasis, leading to obesity...
December 15, 2017: Public Health Genomics
https://www.readbyqxmd.com/read/29223827/colonic-aberrant-crypt-formation-accompanies-an-increase-of-opportunistic-pathogenic-bacteria-in-c57bl-6-mice-fed-a-high-fat-diet
#11
Huawei Zeng, Suzanne L Ishaq, Zhenhua Liu, Michael R Bukowski
The increasing worldwide incidence of colon cancer has been linked to obesity and consumption of a high-fat Western diet. To test the hypothesis that a high-fat diet (HFD) promotes colonic aberrant crypt (AC) formation in a manner associated with gut bacterial dysbiosis, we examined the susceptibility to azoxymethane (AOM)-induced colonic AC and microbiome composition in C57/BL6 mice fed a modified AIN93G diet (AIN, 16% fat, energy) or an HFD (45% fat, energy) for 14 weeks. Mice receiving the HFD exhibited increased plasma leptin, body weight, body fat composition and inflammatory cell infiltration in the ileum compared with those in the AIN group...
November 10, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29222886/salivary-cariogenic-bacteria-counts-are-associated-with-obesity-in-student-women-at-a-malaysian-university
#12
Wey-Zheng Yeo, Sheng-Pei Lim, Yee-How Say
BACKGROUND AND OBJECTIVES: The counts of cariogenic bacteria lactobacilli and mutans streptococci have been studied and correlated with sugar intake. This study was to investigate the association between salivary lactobacilli and mutans streptococci counts with sweet food eating behavior and sweet sensitivity among 120 Malaysian women (101 ethnic Chinese, 19 ethnic Indians), while taking into account anthropometric and menstruation variables. METHODS AND STUDY DESIGN: Demographics, anthropometric measurements and menstrual history were taken...
2018: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29220800/exposure-to-traffic-related-air-pollution-and-the-composition-of-the-gut-microbiota-in-overweight-and-obese-adolescents
#13
Tanya L Alderete, Roshonda B Jones, Zhanghua Chen, Jeniffer S Kim, Rima Habre, Frederick Lurmann, Frank D Gilliland, Michael I Goran
BACKGROUND: Traffic-related air pollution (TRAP) exposure has been linked to type 2 diabetes and metabolic dysfunction in humans. Animal studies suggest that air pollutants may alter the composition of the gut microbiota, which may negatively impact metabolic health through changes in the composition and/or function of the gut microbiome. OBJECTIVES: The primary aim of this study was to determine whether elevated TRAP exposure was correlated with gut bacterial taxa in overweight and obese adolescents from the Meta-AIR (Metabolic and Asthma Incidence Research) study...
December 5, 2017: Environmental Research
https://www.readbyqxmd.com/read/29213261/antibiotic-induced-alterations-in-gut-microbiota-are-associated-with-changes-in-glucose-metabolism-in-healthy-mice
#14
Richard R Rodrigues, Renee L Greer, Xiaoxi Dong, Karen N DSouza, Manoj Gurung, Jia Y Wu, Andrey Morgun, Natalia Shulzhenko
The gut microbiome plays an important role in health and disease. Antibiotics are known to alter gut microbiota, yet their effects on glucose tolerance in lean, normoglycemic mice have not been widely investigated. In this study, we aimed to explore mechanisms by which treatment of lean mice with antibiotics (ampicillin, metronidazole, neomycin, vancomycin, or their cocktail) influences the microbiome and glucose metabolism. Specifically, we sought to: (i) study the effects on body weight, fasting glucose, glucose tolerance, and fasting insulin, (ii) examine the changes in expression of key genes of the bile acid and glucose metabolic pathways in the liver and ileum, (iii) identify the shifts in the cecal microbiota, and (iv) infer interactions between gene expression, microbiome, and the metabolic parameters...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29212824/targeted-microbiome-intervention-by-microencapsulated-delayed-release-niacin-beneficially-affects-insulin-sensitivity-in-humans
#15
Daniela Fangmann, Eva-Maria Theismann, Kathrin Türk, Dominik M Schulte, Isabelle Relling, Katharina Hartmann, Julia K Keppler, Jörg-Rainer Knipp, Ateequr Rehman, Femke-Anouska Heinsen, Andre Franke, Lennart Lenk, Sandra Freitag-Wolf, Esther Appel, Stanislav Gorb, Charles Brenner, Dirk Seegert, Georg H Waetzig, Philip Rosenstiel, Stefan Schreiber, Karin Schwarz, Matthias Laudes
OBJECTIVE: Gut microbiota represent a potential novel target for future prediabetes and type 2 diabetes therapies. In that respect, niacin has been shown to beneficially affect the host-microbiome interaction in rodent models. RESEARCH DESIGN AND METHODS: We characterized more than 500 human subjects with different metabolic phenotypes regarding their niacin (nicotinic acid [NA] and nicotinamide [NAM]) status and their gut microbiome. In addition, NA and NAM delayed-release microcapsules were engineered and examined in vitro and in vivo in two human intervention studies (bioavailability study and proof-of-concept/safety study)...
December 6, 2017: Diabetes Care
https://www.readbyqxmd.com/read/29209439/comparative-study-of-probiotic-effects-of-lactobacillus-and-bifidobacteria-strains-on-cholesterol-levels-liver-morphology-and-the-gut-microbiota-in-obese-mice
#16
Rostyslav V Bubnov, Lidiia P Babenko, Liudmyla M Lazarenko, Viktoria V Mokrozub, Oleksandr A Demchenko, Oleksiy V Nechypurenko, Mykola Ya Spivak
Background: Microbiome-modulating interventions are promising for treatment and prevention of metabolic syndrome. The number of probiotic strains demonstrated ability to decrease cholesterol level in vivo, however, it was poorly confirmed in a clinical setting. The aim was to study the effects of L. acidophilus IMV B-7279, L. casei IMV B-7280, B. animalіs VKL and B. animalіs VKB separately and in various compositions on the level of serum cholesterol, gut microbiota contents and liver morphology on a high-calorie-induced obesity model in BALB/c mice...
December 2017: EPMA Journal
https://www.readbyqxmd.com/read/29208750/erratum-for-sze-and-schloss-looking-for-a-signal-in-the-noise-revisiting-obesity-and-the-microbiome
#17
Marc A Sze, Patrick D Schloss
No abstract text is available yet for this article.
December 5, 2017: MBio
https://www.readbyqxmd.com/read/29206649/the-importance-of-the-microbiome-in-pediatrics-and-pediatric-infectious-diseases
#18
Thaidra Gaufin, Nicole H Tobin, Grace M Aldrovandi
PURPOSE OF REVIEW: Emerging research on the pediatric microbiome implicates the importance of the microbiome on the development of the immune system, nervous system, and growth. Changes to the microbiome during infancy are associated with the development of chronic illnesses such as asthma and inflammatory bowel disease. Additionally, the microbiome provides protection against certain pathogens, affects vaccine responses, and alters drug metabolism. This review highlights what is known about the microbiome, the establishment of a healthy microbiome and the significance that changes to the microbiome composition have on growth and health of children and adolescents...
December 4, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/29205415/systematic-review-human-gut-dysbiosis-induced-by-non-antibiotic-prescription-medications
#19
REVIEW
Q Le Bastard, G A Al-Ghalith, M Grégoire, G Chapelet, F Javaudin, E Dailly, E Batard, D Knights, E Montassier
BACKGROUND: Global prescription drug use has been increasing continuously for decades. The gut microbiome, a key contributor to health status, can be altered by prescription drug use, as antibiotics have been repeatedly described to have both short-term and long-standing effects on the intestinal microbiome. AIM: To summarise current findings on non-antibiotic prescription-induced gut microbiome changes, focusing on the most frequently prescribed therapeutic drug categories...
December 5, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/29197615/interplay-between-the-lung-microbiome-and-lung-cancer
#20
Qixing Mao, Feng Jiang, Rong Yin, Jie Wang, Wenjie Xia, Gaochao Dong, Weidong Ma, Yao Yang, Lin Xu, Jianzhong Hu
The human microbiome confers benefits or disease susceptibility to the human body through multiple pathways. Disruption of the symbiotic balance of the human microbiome is commonly found in systematic diseases such as diabetes, obesity, and chronic gastric diseases. Emerging evidence has suggested that dysbiosis of the microbiota may also play vital roles in carcinogenesis at multiple levels, e.g., by affecting metabolic, inflammatory, or immune pathways. Although the impact of the gut microbiome on the digestive cancer has been widely explored, few studies have investigated the interplay between the microbiome and lung cancer...
November 29, 2017: Cancer Letters
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