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Microbiome gut brain

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https://www.readbyqxmd.com/read/28194099/gut-to-brain-dysbiosis-mechanisms-linking-western-diet-consumption-the-microbiome-and-cognitive-impairment
#1
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/28179108/revisiting-metchnikoff-age-related-alterations-in-microbiota-gut-brain-axis-in-the-mouse
#2
Karen A Scott, Masayuki Ida, Veronica L Peterson, Jack A Prenderville, Gerard M Moloney, Takayuki Izumo, Kiera Murphy, Amy Murphy, R Paul Ross, Catherine Stanton, Timothy G Dinan, John F Cryan
Over the last decade, there has been increased interest in the role of the gut microbiome in health including brain health. This is by no means a new theory; Elie Metchnikoff proposed over a century ago that targeting the gut by consuming lactic acid bacteria such as those in yogurt, could improve or delay the onset of cognitive decline associated with ageing. However, there is limited information characterising the relationship between the behavioural and physiological sequelae of aging and alterations in the gut microbiome...
February 4, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28164856/the-gut-microbiome-in-irritable-bowel-syndrome-and-other-functional-bowel-disorders
#3
REVIEW
Yehuda Ringel
Emerging data from epidemiologic, microbiome, and physiology research in patients with functional bowel disorders (FBDs) provide evidence for a linkage between alterations in the intestinal microbiota and FBDs. However, currently most of the data is based on association studies, and the causality role of the microbiota in these disorders is not established. Growing evidence for compositional changes and the increasing recognition of the association between the intestinal microbiota and gut-brain functions that are relevant to the pathophysiology and/or clinical symptoms of FBDs have led to increased interest in manipulating the intestinal microbiota for the treatment of these disorders...
March 2017: Gastroenterology Clinics of North America
https://www.readbyqxmd.com/read/28164854/the-microbiome-gut-brain-axis-in-health-and-disease
#4
REVIEW
Timothy G Dinan, John F Cryan
Gut microbes are capable of producing most neurotransmitters found in the human brain. Evidence is accumulating to support the view that gut microbes influence central neurochemistry and behavior. Irritable bowel syndrome is regarded as the prototypic disorder of the brain-gut-microbiota axis that can be responsive to probiotic therapy. Translational studies indicate that certain bacteria may have an impact on stress responses and cognitive functioning. Manipulating the gut microbiota with psychobiotics, prebiotics, or even antibiotics offers a novel approach to altering brain function and treating gut-brain axis disorders, such as depression and autism...
March 2017: Gastroenterology Clinics of North America
https://www.readbyqxmd.com/read/28161446/drunk-bugs-chronic-vapour-alcohol-exposure-induces-marked-changes-in-the-gut-microbiome-in-mice
#5
Veronica L Peterson, Nicholas J Jury, Raúl Cabrera-Rubio, Lorraine A Draper, Fiona Crispie, Paul D Cotter, Timothy G Dinan, Andrew Holmes, John F Cryan
The gut microbiota includes a community of bacteria that play an integral part in host health and biological processes. Pronounced and repeated findings have linked gut microbiome to stress, anxiety, and depression. Currently, however, there remains only a limited set of studies focusing on microbiota change in substance abuse, including alcohol use disorder. To date, no studies have investigated the impact of vapour alcohol administration on the gut microbiome. For research on gut microbiota and addiction to proceed, an understanding of how route of drug administration affects gut microbiota must first be established...
February 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28147375/fecal-microbiota-transplantation-in-inflammatory-bowel-disease
#6
Walter Reinisch
The etiology of inflammatory bowel disease (IBD) is unknown, but it is thought to arise from an aberrant immune response to a change in colonic environment in a genetically susceptible individual. The intestinal microbiota are located at the complex interface of the epithelial barrier and are sensitive to changes in environmental factors, such as diets, drugs or smoking and signals derived from the intestinal immune system and the gut-brain axis. In patients with IBD, an imbalance in the structural and/or functional configuration of the intestinal microbiota leading to the disruption of the host-microorganism homeostasis (dysbiosis) has been reproducibly reported...
2017: Digestive Diseases
https://www.readbyqxmd.com/read/28144744/food-matters-how-the-microbiome-and-gut-brain-interaction-might-impact-the-development-and-course-of-anorexia-nervosa
#7
REVIEW
Beate Herpertz-Dahlmann, Jochen Seitz, John Baines
Anorexia nervosa (AN) is one of the most common chronic illnesses in female adolescents and exhibits the highest mortality risk of all psychiatric disorders. Evidence for the effectiveness of psychotherapeutic or psychopharmacological interventions is weak. Mounting data indicate that the gut microbiome interacts with the central nervous system and the immune system by neuroendocrine, neurotransmitter, neurotrophic and neuroinflammatory afferent and efferent pathways. There is growing evidence that the gut microbiota influences weight regulation and psychopathology, such as anxiety and depression...
January 31, 2017: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/28094019/the-first-model-of-keeping-energy-balance-and-optimal-psycho-affective-development-breastfed-infants
#8
REVIEW
Carlo Agostoni, Alessandra Mazzocchi, Ludovica Leone, Valentina Ciappolino, Giuseppe Delvecchio, Carlo A Altamura, Paolo Brambilla
BACKGROUND: Breastfed infants follow a peculiar growth fashion characterized by a rapid weight gain in the first weeks of life, then followed by a fast decrease in growth rates, a capacity to self-regulate the sense of hungry and satiety, and a minor propensity towards overweight and obesity later on, in parallel with a better neurodevelopmental performance. METHODS: We searched studies investigating the relationship between the feeding mode in infancy and the energy balance, so the possible associations with total energy expenditure and intake regulation...
January 5, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28069755/influence-of-the-gut-microbiome-on-autoimmunity-in-the-central-nervous-system
#9
REVIEW
Sara L Colpitts, Lloyd H Kasper
Autoimmune disorders of the CNS have complex pathogeneses that are not well understood. In multiple sclerosis and neuromyelitis optica spectrum disorders, T cells destroy CNS tissue, resulting in severe disabilities. Mounting evidence suggests that reducing inflammation in the CNS may start with modulation of the gut microbiome. The lymphoid tissues of the gut are specialized for the induction of regulatory cells, which are directly responsible for the suppression of CNS-damaging autoreactive T cells. Whether cause or effect, the onset of dysbiosis in the gut of patients with multiple sclerosis and neuromyelitis optica provides evidence of communication along the gut-brain axis...
January 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28042926/the-potential-impact-of-gut-microbiota-on-your-health-current-status-and-future-challenges
#10
Stitaya Sirisinha
Our health and probably also our behaviors and mood depend not only on what we eat or what we do (lifestyle behaviors), but also on what we host. It is well established for decades that all vertebrates including humans are colonized by a wide array of bacteria, fungi, eukaryotic parasites and viruses, and that, at steady state (homeostasis), this community of microbes establishes a friendly mutual relationship with the host. The term microbiota was originally meant to represent an ecological community of commensals and potentially pathogenic microbes that live within our bodies, but it is now used interchangeably with the term microbiome which was initially meant to represent a collective genome of the microbiota...
December 2016: Asian Pacific Journal of Allergy and Immunology
https://www.readbyqxmd.com/read/28035935/altered-gut-microbiome-composition-and-tryptic-activity-of-the-5xfad-alzheimer-s-mouse-model
#11
Carolin Brandscheid, Florian Schuck, Sven Reinhardt, Karl-Herbert Schäfer, Claus U Pietrzik, Marcus Grimm, Tobias Hartmann, Andreas Schwiertz, Kristina Endres
The regulation of physiological gut functions such as peristalsis or secretion of digestive enzymes by the central nervous system via the Nervus vagus is well known. Recent investigations highlight that pathological conditions of neurological or psychiatric disorders might directly interfere with the autonomous neuronal network of the gut - the enteric nervous system, or even derive from there. By using a murine Alzheimer's disease model, we investigated a potential influence of disease-associated changes on gastrointestinal properties...
December 30, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27981187/the-microbiome-a-key-regulator-of-stress-and-neuroinflammation
#12
REVIEW
Kieran Rea, Timothy G Dinan, John F Cryan
There is a growing emphasis on the relationship between the complexity and diversity of the microorganisms that inhabit our gut (human gastrointestinal microbiota) and health/disease, including brain health and disorders of the central nervous system. The microbiota-gut-brain axis is a dynamic matrix of tissues and organs including the brain, glands, gut, immune cells and gastrointestinal microbiota that communicate in a complex multidirectional manner to maintain homeostasis. Changes in this environment can lead to a broad spectrum of physiological and behavioural effects including hypothalamic-pituitary-adrenal (HPA) axis activation, and altered activity of neurotransmitter systems and immune function...
October 2016: Neurobiology of Stress
https://www.readbyqxmd.com/read/27934651/a-perspective-on-the-safety-of-supplemental-tryptophan-based-on-its-metabolic-fates
#13
REVIEW
John D Fernstrom
Over the past 50 y, tryptophan has been ingested in amounts well in excess of its dietary requirement. This use is based on extensive findings that ingesting tryptophan increases brain tryptophan concentrations, which stimulates the synthesis and release of the neurotransmitter serotonin, from which it is derived. Such increases in serotonin function may improve mood and sleep. However, tryptophan ingestion has other effects, such as increasing serotonin production in the gut, increasing serotonin concentrations in blood, stimulating the production of the hormone melatonin (a tryptophan metabolite), stimulating tryptophan metabolism via the kynurenine pathway, and possibly stimulating the production of tryptophan metabolites in the gut microbiome...
December 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27924137/exercise-induced-stress-behavior-gut-microbiota-brain-axis-and-diet-a-systematic-review-for-athletes
#14
REVIEW
Allison Clark, Núria Mach
Fatigue, mood disturbances, under performance and gastrointestinal distress are common among athletes during training and competition. The psychosocial and physical demands during intense exercise can initiate a stress response activating the sympathetic-adrenomedullary and hypothalamus-pituitary-adrenal (HPA) axes, resulting in the release of stress and catabolic hormones, inflammatory cytokines and microbial molecules. The gut is home to trillions of microorganisms that have fundamental roles in many aspects of human biology, including metabolism, endocrine, neuronal and immune function...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27922565/a-perspective-on-brain-gut-communication-the-american-gastroenterology-association-and-american-psychosomatic-society-joint-symposium-on-brain-gut-interactions-and-the-intestinal-microenvironment
#15
Olga C Aroniadis, Douglas A Drossman, Magnus Simren
BACKGROUND: Alterations in brain-gut communication and the intestinal microenvironment have been implicated in a variety of medical and neuropsychiatric diseases. Three central areas require basic and clinical research: (1) how the intestinal microenvironment interacts with the host immune system, central nervous system and enteric nervous system; (2) the role of the intestinal microenvironment in the pathogenesis of medical and neuropsychiatric disease; (3) the effects of diet, prebiotics, probiotics and fecal microbiota transplantation on the intestinal microenvironment and the treatment of disease...
January 17, 2017: Psychosomatic Medicine
https://www.readbyqxmd.com/read/27912057/gut-microbiota-regulate-motor-deficits-and-neuroinflammation-in-a-model-of-parkinson-s-disease
#16
Timothy R Sampson, Justine W Debelius, Taren Thron, Stefan Janssen, Gauri G Shastri, Zehra Esra Ilhan, Collin Challis, Catherine E Schretter, Sandra Rocha, Viviana Gradinaru, Marie-Francoise Chesselet, Ali Keshavarzian, Kathleen M Shannon, Rosa Krajmalnik-Brown, Pernilla Wittung-Stafshede, Rob Knight, Sarkis K Mazmanian
The intestinal microbiota influence neurodevelopment, modulate behavior, and contribute to neurological disorders. However, a functional link between gut bacteria and neurodegenerative diseases remains unexplored. Synucleinopathies are characterized by aggregation of the protein α-synuclein (αSyn), often resulting in motor dysfunction as exemplified by Parkinson's disease (PD). Using mice that overexpress αSyn, we report herein that gut microbiota are required for motor deficits, microglia activation, and αSyn pathology...
December 1, 2016: Cell
https://www.readbyqxmd.com/read/27911317/alzheimer-s-disease-histological-and%C3%A2-behavioral-manifestations-in%C3%A2-transgenic-mice-correlate-with%C3%A2-specific%C3%A2-gut-microbiome-state
#17
Liang Shen, Lu Liu, Hong-Fang Ji
Alzheimer's disease (AD) is a neurodegenerative brain disease and is the most common form of dementia. In recent years, many studies indicated the association of gut microbiota changes with metabolic diseases. However, the gut microbiota of AD has not been investigated. The present study aims to compare the gut microbiota in APP/PS1 transgenic mice of AD and C57/Bl6 wild-type (WT) mice by pyrosequencing the V3 and V4 regions of the bacterial 16S ribosomal RNA genes. The 3-, 6-, and 8-month-old APP/PS1 and WT mice were used to explore the effects of age on the gut microbiota...
November 28, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27884012/gut-microbiota-bacterial-translocation-and-interactions-with-diet-pathophysiological-links-between-major-depressive-disorder-and-non-communicable-medical-comorbidities
#18
Anastasiya Slyepchenko, Michael Maes, Felice N Jacka, Cristiano A Köhler, Tatiana Barichello, Roger S McIntyre, Michael Berk, Iria Grande, Jane A Foster, Eduard Vieta, André F Carvalho
BACKGROUND: Persistent low-grade immune-inflammatory processes, oxidative and nitrosative stress (O&NS), and hypothalamic-pituitary-adrenal axis activation are integral to the pathophysiology of major depressive disorder (MDD). The microbiome, intestinal compositional changes, and resultant bacterial translocation add a new element to the bidirectional interactions of the gut-brain axis; new evidence implicates these pathways in the patho-aetiology of MDD. In addition, abnormalities in the gut-brain axis are associated with several chronic non-communicable disorders, which frequently co-occur in individuals with MDD, including but not limited to irritable bowel syndrome (IBS), chronic fatigue syndrome (CFS), obesity, and type 2 diabetes mellitus (T2DM)...
2017: Psychotherapy and Psychosomatics
https://www.readbyqxmd.com/read/27875954/how-immune-inflammatory-processes-link-cns-and-psychiatric-disorders-classification-and-treatment-implications
#19
George Anderson, Michael Maes
In this article the emerging biological overlaps of CNS disorders and psychiatric conditions are reviewed. Recent work has highlighted how immune-inflammatory processes and their interactions with oxidative and nitrosative stress, couple to drive changes in neuroregulatory tryptophan catabolites, with consequences for serotonin availability, including as a precursor for the melatonergic pathways. Subsequent alterations in the regulation of local melatonin synthesis are likely to have direct impacts on the reactivity of immune cells, both centrally and systemically...
November 22, 2016: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/27871802/probiotic-normalization-of-candida-albicans-in-schizophrenia-a-randomized-placebo-controlled-longitudinal-pilot-study
#20
Emily G Severance, Kristin L Gressitt, Cassie R Stallings, Emily Katsafanas, Lucy A Schweinfurth, Christina L G Savage, Maria B Adamos, Kevin M Sweeney, Andrea E Origoni, Sunil Khushalani, Faith B Dickerson, Robert H Yolken
The molecules and pathways of the gut-brain axis represent new targets for developing methods to diagnose and treat psychiatric disorders. Manipulation of the gut microbiome with probiotics may be a therapeutic strategy with the potential to relieve gastrointestinal (GI) comorbidities and improve psychiatric symptoms. Candida albicans and Saccharomyces cerevisiae, commensal yeast species, can be imbalanced in the unhealthy human microbiome, and these fungal exposures were previously found elevated in schizophrenia...
November 18, 2016: Brain, Behavior, and Immunity
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