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https://www.readbyqxmd.com/read/28222761/new-evidences-on-the-altered-gut-microbiota-in-autism-spectrum-disorders
#1
Francesco Strati, Duccio Cavalieri, Davide Albanese, Claudio De Felice, Claudio Donati, Joussef Hayek, Olivier Jousson, Silvia Leoncini, Daniela Renzi, Antonio Calabrò, Carlotta De Filippo
BACKGROUND: Autism spectrum disorders (ASDs) are neurodevelopmental conditions characterized by social and behavioural impairments. In addition to neurological symptoms, ASD subjects frequently suffer from gastrointestinal abnormalities, thus implying a role of the gut microbiota in ASD gastrointestinal pathophysiology. RESULTS: Here, we characterized the bacterial and fungal gut microbiota in a cohort of autistic individuals demonstrating the presence of an altered microbial community structure...
February 22, 2017: Microbiome
https://www.readbyqxmd.com/read/28215985/detection-of-clostridium-perfringens-toxin-genes-in-the-gut-microbiota-of-autistic-children
#2
Sydney M Finegold, Paula H Summanen, Julia Downes, Karen Corbett, Tomoe Komoriya
We studied stool specimens from 33 autistic children aged 2-9 years with gastrointestinal (GI) abnormalities and 13 control children without autism and without GI symptoms. We performed quantitative comparison of all Clostridium species and Clostridium perfringens strains from the fecal microbiota by conventional, selective anaerobic culture methods. We isolated C. perfringens strains and performed PCR analysis for the main C. perfringens toxin genes, alpha, beta, beta2, epsilon, iota and C. perfringens enterotoxin gene...
February 16, 2017: Anaerobe
https://www.readbyqxmd.com/read/28215162/gut-brain-axis-role-of-lipids-in-the-regulation-of-inflammation-pain-and-cns-diseases
#3
Roberto Russo, Claudia Cristiano, Carmen Avagliano, Carmen De Caro, Giovanna La Rana, Giuseppina Mattace Raso, Roberto Berni Canani, Rosaria Meli, Antonio Calignano
The human gut is a composite anaerobic environment with a large, diverse and dynamic enteric microbiota, represented by more than 100 trillion microorganisms, including at least 1000 distinct species. The discovery that a different microbial composition can influence behavior and cognition, and in turn the nervous system can indirectly influence enteric microbiota composition, has significantly contributed to establish the well-accepted concept of gut-brain axis. This hypothesis is supported by several evidence showing mutual mechanisms, which involve the vague nerve, the immune system, the hypothalamic-pituitary-adrenal (HPA) axis modulation and the bacteria-derived metabolites...
February 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28213183/a-role-for-the-serotonin-reuptake-transporter-in-the-brain-and-intestinal-features-of-autism-spectrum-disorders-and-developmental-antidepressant-exposure
#4
REVIEW
Kara Gross Margolis
Many disease conditions considered CNS-predominant harbor significant intestinal comorbidities. Serotonin (5-HT) and the serotonin reuptake transporter (SERT) have increasingly been shown to play important roles in both brain and intestinal development and long-term function. 5-HT and SERT may thus modulate critical functions in the development and perpetuation of brain-gut axis disease. We discuss the potential roles of 5-HT and SERT in the brain and intestinal manifestations of autism spectrum disorders and developmental antidepressant exposure...
February 14, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28178201/rett-syndrome-a-focus-on-gut-microbiota
#5
Elisa Borghi, Francesca Borgo, Marco Severgnini, Miriam Nella Savini, Maria Cristina Casiraghi, Aglaia Vignoli
Rett syndrome (RTT) is an X-linked neurodevelopmental disorder affecting 1 in 10,000 live female births. Changes in microbiota composition, as observed in other neurological disorders such as autism spectrum disorders, may account for several symptoms typically associated with RTT. We studied the relationship between disease phenotypes and microbiome by analyzing diet, gut microbiota, and short-chain fatty acid (SCFA) production. We enrolled eight RTT patients and 10 age- and sex-matched healthy women, all without dietary restrictions...
February 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28171816/the-western-disease-autism-and-somali-parents-embodied-health-movements
#6
Claire Laurier Decoteau
There is some statistical evidence indicating that Somali refugees and immigrants have high rates of autism spectrum disorder (ASD). Somalis in North America call autism the "Western disease" because there is no word for autism in the Somali language and because many believe it does not exist in Somalia. In Toronto, Somali parents have forged an "epistemic community," united around a coherent theory of the development of autism, its defining features, and most successful therapies. They work together with researchers to support the theory that gut bacteria is a causal factor for the development of autism...
February 1, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28164854/the-microbiome-gut-brain-axis-in-health-and-disease
#7
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/28164844/basic-definitions-and-concepts-organization-of-the-gut-microbiome
#8
REVIEW
Eamonn M M Quigley
New claims are frequently made for a role for the microbiome in a disease or disorder previously considered remote from the gut. The microbiome has been linked to such seemingly unrelated entities as depression, anorexia nervosa, autism, Parkinson disease, allergy, and asthma. Although many of these proposals have been based on animal studies, explorations of the microbiome in human disease continue to proliferate, facilitated by technologies that provide a detailed assessment of the microbial inhabitants of our gastrointestinal tract and their biological activities and metabolic products...
March 2017: Gastroenterology Clinics of North America
https://www.readbyqxmd.com/read/28122648/microbiota-transfer-therapy-alters-gut-ecosystem-and-improves-gastrointestinal-and-autism-symptoms-an-open-label-study
#9
Dae-Wook Kang, James B Adams, Ann C Gregory, Thomas Borody, Lauren Chittick, Alessio Fasano, Alexander Khoruts, Elizabeth Geis, Juan Maldonado, Sharon McDonough-Means, Elena L Pollard, Simon Roux, Michael J Sadowsky, Karen Schwarzberg Lipson, Matthew B Sullivan, J Gregory Caporaso, Rosa Krajmalnik-Brown
BACKGROUND: Autism spectrum disorders (ASD) are complex neurobiological disorders that impair social interactions and communication and lead to restricted, repetitive, and stereotyped patterns of behavior, interests, and activities. The causes of these disorders remain poorly understood, but gut microbiota, the 10(13) bacteria in the human intestines, have been implicated because children with ASD often suffer gastrointestinal (GI) problems that correlate with ASD severity. Several previous studies have reported abnormal gut bacteria in children with ASD...
January 23, 2017: Microbiome
https://www.readbyqxmd.com/read/28092661/interactions-between-the-microbiota-immune-and-nervous-systems-in-health-and-disease
#10
REVIEW
Thomas C Fung, Christine A Olson, Elaine Y Hsiao
The diverse collection of microorganisms that inhabit the gastrointestinal tract, collectively called the gut microbiota, profoundly influences many aspects of host physiology, including nutrient metabolism, resistance to infection and immune system development. Studies investigating the gut-brain axis demonstrate a critical role for the gut microbiota in orchestrating brain development and behavior, and the immune system is emerging as an important regulator of these interactions. Intestinal microbes modulate the maturation and function of tissue-resident immune cells in the CNS...
February 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28028357/can-probiotics-benefit-children-with-autism-spectrum-disorders
#11
REVIEW
Fernando Navarro, Yuying Liu, Jon Marc Rhoads
Children with autism are commonly affected by gastrointestinal problems such as abdominal pain, constipation and diarrhea. In recent years, there has been a growing interest in the use of probiotics in this population, as it hypothetically may help to improve bowel habits and the behavioral and social functioning of these individuals. The gut microbiome plays an important role in the pathophysiology of organic as well as functional gastrointestinal disorders. Microbial modification with the use of antibiotics, probiotics, and fecal transplantation have been effective in the treatment of conditions such as recurrent Clostridium difficile infection, pouchitis, and irritable bowel syndrome...
December 14, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27957319/blood-brain-barrier-and-intestinal-epithelial-barrier-alterations-in-autism-spectrum-disorders
#12
Maria Fiorentino, Anna Sapone, Stefania Senger, Stephanie S Camhi, Sarah M Kadzielski, Timothy M Buie, Deanna L Kelly, Nicola Cascella, Alessio Fasano
BACKGROUND: Autism spectrum disorders (ASD) are complex conditions whose pathogenesis may be attributed to gene-environment interactions. There are no definitive mechanisms explaining how environmental triggers can lead to ASD although the involvement of inflammation and immunity has been suggested. Inappropriate antigen trafficking through an impaired intestinal barrier, followed by passage of these antigens or immune-activated complexes through a permissive blood-brain barrier (BBB), can be part of the chain of events leading to these disorders...
2016: Molecular Autism
https://www.readbyqxmd.com/read/27904735/urinary-metabolomics-of-young-italian-autistic-children-supports-abnormal-tryptophan-and-purine-metabolism
#13
Federica Gevi, Lello Zolla, Stefano Gabriele, Antonio M Persico
BACKGROUND: Autism spectrum disorder (ASD) is still diagnosed through behavioral observation, due to a lack of laboratory biomarkers, which could greatly aid clinicians in providing earlier and more reliable diagnoses. Metabolomics on human biofluids provides a sensitive tool to identify metabolite profiles potentially usable as biomarkers for ASD. Initial metabolomic studies, analyzing urines and plasma of ASD and control individuals, suggested that autistic patients may share some metabolic abnormalities, despite several inconsistencies stemming from differences in technology, ethnicity, age range, and definition of "control" status...
2016: Molecular Autism
https://www.readbyqxmd.com/read/27882443/gut-microbiota-and-autism-key-concepts-and-findings
#14
Helen T Ding, Ying Taur, John T Walkup
There is an emerging body of evidence linking the intestinal microbiota with autism spectrum disorders (ASD). Studies have demonstrated differences in the composition of gut bacteria between children with ASD and controls. Certain intestinal bacteria have been observed in abundance and may be involved in the pathogenesis of ASD; including members of the Clostridium and Sutterella genus. Evidence from animal models suggest that certain microbial shifts in the gut may produce changes consistent with the clinical picture of autism, with proposed mechanisms including toxin production, aberrations in fermentation processes/products, and immunological and metabolic abnormalities...
November 24, 2016: Journal of Autism and Developmental Disorders
https://www.readbyqxmd.com/read/27864534/microbiome-and-nutrition-in-autism-spectrum-disorder-current-knowledge-and-research-needs
#15
Kirsten Berding, Sharon M Donovan
Autism spectrum disorder (ASD) is the fastest growing neurodevelopmental disorder in the United States. Besides genetic risks, environmental factors have been suggested to contribute to the increase in ASD diagnosis over the past decade. Several studies have reported abnormalities in microbiota composition and differences in microbial metabolites in children with ASD. Gastrointestinal discomfort is commonly reported in children with ASD. Additionally, food selectivity and picky eating patterns are commonly reported...
December 2016: Nutrition Reviews
https://www.readbyqxmd.com/read/27856622/in-vitro-fermentation-of-b-gos-impact-on-faecal-bacterial-populations-and-metabolic-activity-in-autistic-and-non-autistic-children
#16
Roberta Grimaldi, Drinalda Cela, Jonathan R Swann, Jelena Vulevic, Glenn R Gibson, George Tzortzis, Adele Costabile
Children with autism spectrum disorders (ASD) often suffer gastrointestinal problems consistent with imbalances in the gut microbial population. Treatment with antibiotics or pro/prebiotics has been postulated to regulate microbiota and improve gut symptoms, but there is a lack of evidence for such approaches, especially for prebiotics. This study assessed the influence of a prebiotic galactooligosaccharide (B-GOS) on gut microbial ecology and metabolic function using faecal samples from autistic and non-autistic children in an in vitro gut model system...
February 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27843150/the-bacterial-peptidoglycan-sensing-molecule-pglyrp2-modulates-brain-development-and-behavior
#17
T Arentsen, Y Qian, S Gkotzis, T Femenia, T Wang, K Udekwu, H Forssberg, R Diaz Heijtz
Recent studies have revealed that the gut microbiota modulates brain development and behavior, but the underlying mechanisms are still poorly understood. Here, we show that bacterial peptidoglycan (PGN) derived from the commensal gut microbiota can be translocated into the brain and sensed by specific pattern-recognition receptors (PRRs) of the innate immune system. Using expression-profiling techniques, we demonstrate that two families of PRRs that specifically detect PGN (that is, PGN-recognition proteins and NOD-like receptors), and the PGN transporter PepT1 are highly expressed in the developing brain during specific windows of postnatal development in both males and females...
February 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/27816476/sex-specific-modulation-of-the-gut-microbiome-and-behavior-in-siberian-hamsters
#18
Kristyn E Sylvia, Cathleen P Jewell, Nikki M Rendon, Emma A St John, Gregory E Demas
The gut microbiome is a diverse, host-specific, and symbiotic bacterial environment that is critical for mammalian survival and exerts a surprising yet powerful influence on brain and behavior. Gut dysbiosis has been linked to a wide range of physical and psychological disorders, including autism spectrum disorders and anxiety, as well as autoimmune and inflammatory disorders. A wealth of information on the effects of dysbiosis on anxiety and depression has been reported in laboratory model systems (e.g., germ-free mice); however, the effects of microbiome disruption on social behaviors (e...
February 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/27814521/the-central-nervous-system-and-the-gut-microbiome
#19
REVIEW
Gil Sharon, Timothy R Sampson, Daniel H Geschwind, Sarkis K Mazmanian
Neurodevelopment is a complex process governed by both intrinsic and extrinsic signals. While historically studied by researching the brain, inputs from the periphery impact many neurological conditions. Indeed, emerging data suggest communication between the gut and the brain in anxiety, depression, cognition, and autism spectrum disorder (ASD). The development of a healthy, functional brain depends on key pre- and post-natal events that integrate environmental cues, such as molecular signals from the gut...
November 3, 2016: Cell
https://www.readbyqxmd.com/read/27793223/gut-to-brain-axis-in-autism-spectrum-disorders-central-role-for-the-microbiome
#20
A D Kraneveld, K Szklany, C G M de Theije, J Garssen
Autism spectrum disorders (ASDs) are neurodevelopmental disorders, which occur in early childhood and persist into adulthood. Although the etiology of these disorders is largely unknown, genetic and environmental factors are thought to interplay in the development of ASD. Intestinal microbial dysbiosis, in prenatal and postnatal phases, is an important example of these environmental factors, and gastrointestinal problems including adverse reactions to foods are often reported in these children. In this review, we address the clinical and preclinical findings on the role of the intestinal microbiome in ASD and suggest possible underlying mechanisms...
2016: International Review of Neurobiology
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