Role of gut microbiota in human health and diseases

2020 ◽  
Vol 16 ◽  
Author(s):  
Athira Paingott Narayanan ◽  
Merin Babu ◽  
Ankitha Latika ◽  
Anjali Shobha Nair ◽  
Pooja Ajesh ◽  
...  
Keyword(s):  
Neurological Disorders ◽  
Intestinal Flora ◽  
Gastrointestinal Disorders ◽  
Gut Flora ◽  
Microbial Composition ◽  
Health Changes ◽  
Inflammatory Bowel ◽  
Irritable Bowel ◽  
Changes Over Time

: Every human body has a gut microbiome which is a complex collection of microorganisms that live in the digestive tracts. The composition of the gut flora changes over time, when diet changes, overall health changes. Intestinal flora hosts more amounts of the microbes when compared to stomach flora as it's less vulnerable to the acidity of the gastric mucosa. Intestinal flora plays a major role in balancing the immune function, metabolic homeostasis, regulates inflammation, increases mineral bioavailability, synthesizes neurotransmitters, regulates appetite, regulates blood sugar and prevention against pathogens. Dysbiosis in the gut leads to various gastrointestinal disorders like inflammatory bowel disease, irritable bowel syndrome, peptic ulcer, metabolic syndromes like obesity, diabetes and various neurological disorders like autism, multiple sclerosis. Therefore, the complete wellness of our body is dependent on the microbial composition of the gut. Probiotics and prebiotic foods can add as a key element supplementing the wellness of our body.

Are Viruses and Parasites Linked to Celiac Disease? A Question that Still has no Definite Answer

2019 ◽  
Vol 20 (14) ◽  
pp. 1181-1193 ◽  
Author(s):  
Aref Shariati ◽  
Hamid R. Aslani ◽  
Mohammad R.H. Shayesteh ◽  
Ali Taghipour ◽  
Ahmad Nasser ◽  
...  
Keyword(s):  
Celiac Disease ◽  
Multiple Roles ◽  
Barr Virus ◽  
The People ◽  
Intestinal Infections ◽  
Inflammatory Bowel ◽  
Epstein Barr ◽  
Irritable Bowel ◽  
Related Proteins

Celiac Disease (CD) is a complex autoimmune enteropathy of the small intestine that commonly occurs in genetically predisposed individuals due to intake of gluten and related proteins. Gluten consumption, duration of breast-feeding, various infections, especially frequent intestinal infections, vaccinations and use of antibiotics can be linked to CD. It is predicted that it affects 1% of the global population and its incidence rate is increasing. Most of the people with the HLA-DQ2 or HLADQ8 are at a higher risk of developing this disease. The link between infections and autoimmune diseases has been very much considered in recent years. In several studies, we explained that pathogenic and non-pathogenic microorganisms might have multiple roles in initiation, exacerbation, and development of Irritable Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD). In various studies, the relationship between infections caused by viruses, such as Epstein-Barr Virus (EBV), Rotavirus, Hepatitis C (HCV), Hepatitis B virus (HBV), Cytomegalovirus (CMV), and Influenza virus, and parasites including Giardia spp. and Toxoplasma gondii with CD has been raised. However, increasing evidence proposes that some of these microorganisms, especially helminths, can also have protective and even therapeutic roles in the CD process. Therefore, in order to determine the role of microorganisms in the process of this disease, we attempted to summarize the evidence suggesting the role of viral and parasitic agents in pathogenesis of CD.

scholarly journals Irritable bowel syndrome: new insights into symptom mechanisms and advances in treatment

F1000Research ◽  
2016 ◽  
Vol 5 ◽  
pp. 780 ◽  
Author(s):  
Robin Spiller
Keyword(s):  
Irritable Bowel Syndrome ◽  
New Agents ◽  
Enteric Nerves ◽  
Inflammatory Bowel ◽  
Magnetic Resonance Imaging Mri ◽  
Irritable Bowel ◽  
Fodmap Diet ◽  
And Function ◽  
The Impact

Despite being one of the most common conditions leading to gastroenterological referral, irritable bowel syndrome (IBS) is poorly understood. However, recent years have seen major advances. These include new understanding of the role of both inflammation and altered microbiota as well as the impact of dietary intolerances as illuminated by magnetic resonance imaging (MRI), which has thrown new light on IBS. This article will review new data on how excessive bile acid secretion mediates diarrhea and evidence from post infectious IBS which has shown how gut inflammation can alter gut microbiota and function. Studies of patients with inflammatory bowel disease (IBD) have also shown that even when inflammation is in remission, the altered enteric nerves and abnormal microbiota can generate IBS-like symptoms. The efficacy of the low FODMAP diet as a treatment for bloating, flatulence, and abdominal discomfort has been demonstrated by randomized controlled trials. MRI studies, which can quantify intestinal volumes, have provided new insights into how FODMAPs cause symptoms. This article will focus on these areas together with recent trials of new agents, which this author believes will alter clinical practice within the foreseeable future.

Prebiotics and probiotics in irritable bowel syndrome and inflammatory bowel disease in children

2015 ◽  
Vol 6 (2) ◽  
pp. 209-217 ◽  
Author(s):  
S. Guandalini ◽  
E. Cernat ◽  
D. Moscoso
Keyword(s):  
Inflammatory Bowel Disease ◽  
Clinical Trials ◽  
Irritable Bowel Syndrome ◽  
Abdominal Pain ◽  
Intestinal Microbiota ◽  
Functional Gastrointestinal Disorders ◽  
Gastrointestinal Disorders ◽  
Controlled Trials ◽  
Inflammatory Bowel ◽  
Irritable Bowel

Underlying pathophysiological mechanisms of irritable bowel syndrome (IBS), a common disorder characterized by abdominal pain associated to a change in stool consistency or frequency, include low-grade inflammation and intestinal microbiota changes. Few and disappointing data are available for prebiotics. A few controlled trials (RCTs) of probiotics are instead available with favourable effects, although most are limited by suboptimal design and small sample size. A recent report from the Rome foundation group included 32 RCTs of probiotics, most of which showed an overall modest improvement in symptoms, with the patients most benefitting from probiotics being those with predominant diarrhoea and those having a post-infectious IBS. A review focusing only on children with functional gastrointestinal disorders concluded that probiotics are more effective than placebo in the treatment of patients with abdominal pain-related functional gastrointestinal disorders, although no effect on constipation was evident. The role for probiotics in inflammatory bowel disease (IBD) appears logical: the endogenous intestinal microbiota plays a central role in their development, and various probiotics have been found effective in animal models of IBD. However, research in humans has been overall quite limited, and it would seem that after a phase of intense research in the first decade of this century, the pace has slowed down, with fewer clinical trials been published in the past 2-3 years. To summarize current evidence: no probiotic has proven successful in Crohn's disease. In ulcerative colitis, on the other hand, data are more promising, and a very recent meta-analysis, that included 23 randomized controlled trials, concluded that there is evidence of efficacy for the probiotic mixture VSL#3 in helping inducing and maintaining remission, as well as in maintaining remission in patients with pouchitis. It is fair to state that for both IBD and IBS, more well-designed, rigorous, randomized clinical trials must be performed.

The Use of Antidepressants in Functional Gastrointestinal Disorders: New Uses for Old Drugs

CNS Spectrums ◽  
2005 ◽  
Vol 10 (11) ◽  
pp. 891-896 ◽  
Author(s):  
Kevin W. Olden
Keyword(s):  
Functional Gastrointestinal Disorders ◽  
Antidepressant Drugs ◽  
Well Being ◽  
Gastrointestinal Disorders ◽  
Noncardiac Chest Pain ◽  
Ulcer Disease ◽  
Functional Gi Disorders ◽  
Irritable Bowel ◽  
The Impact

ABSTRACTSince their introduction 50 years ago, antidepressants have been used in a wide variety of settings involving gastrointestinal (GI) disease. In the 1950s, antidepressants were shown to have some efficacy for the treatment of peptic ulcer disease. This is most likely due to their antihistaminic and anticholinergic effects. Since then, more efficacious and more disease-specific treatments have become available. In the last 20 years, antidepressants have been increasingly used for the treatment of functional gastrointestinal disorders such as irritable bowel syndrome, noncardiac chest pain, and other functional GI disorders. This article will review the rationale for the use of antidepressant drugs for the treatment of functional GI disorders. The role of psychiatric comorbidity in functional GI disorders, the impact of antidepressants on GI motility and visceral sensation, and the ability of these agents to produce improvements in the global well-being and overall quality of life will be reviewed. Finally, guidelines for prescribing and barriers to a patient's acceptance of these agents will be discussed.

scholarly journals The role of intestinal microbiota in irritable bowel syndrome

2018 ◽  
Vol 72 ◽  
pp. 215-226
Author(s):  
Tomasz Dworzański ◽  
Rafał Fornal ◽  
Łukasz Koźba ◽  
Krzysztof Celiński ◽  
Ewa Dworzańska
Keyword(s):  
Irritable Bowel Syndrome ◽  
Intestinal Microbiota ◽  
Human Body ◽  
Intestinal Flora ◽  
Faecal Flora ◽  
Vast Number ◽  
Beneficial Effects ◽  
Irritable Bowel ◽  
Micro Organisms

In recent years, impressive advances in the knowledge about a vast number of microbes living in the human body and interactions between the microbiota and the human body have been observed. All micro-organisms that live in the human body consist of around 10 ^ 14 cells. The number of microbial cells colonizing the human body is ten times higher than the number of its own cells and the weight of all micro-organisms is about 2-2.5 kg. The number of bacterial genes is 50-100 times greater than the number of genes in the human body. Nowadays, the human microbiota is often regarded as a “newly discovered organ” or even as a “supergenome”. The results of many studies have revealed that disruption of the bowel microecosystem may affect the development of irritable bowel syndrome (IBS) symptoms. Therefore, manipulation of the gut microflora was hoped to be a new tool in the treatment of this disease. Various methods (probiotics, prebiotics, antibiotic therapy, transplantation of faecal flora) have been used to modify the intestinal microbiota by supporting the expansion of bacteria considered beneficial and reducing the number of those regarded as harmful, thus alleviating the IBS symptoms. There is much evidence in the literature to suggest that the intestinal microbiota and the gut-intestinal axis are important factors in the pathogenesis of IBS. Moreover, the literature findings have demonstrated beneficial effects of modifying the intestinal flora composition in alleviating IBS symptoms. Although the pathophysiology of IBS and the role of the intestinal microflora and gut-intestinal axis in it are well known, many issues are still to be elucidated. Further research into the bacteria identified in stool and colon mucosa of healthy individuals should provide more information on restoration of intestinal homeostasis in IBS patients.

scholarly journals Shared and disease-specific host gene-microbiome interactions across human diseases

2021 ◽  
Author(s):  
Sambhawa Priya ◽  
Michael B. Burns ◽  
Tonya Ward ◽  
Ruben A. T. Mars ◽  
Beth Adamowicz ◽  
...  
Keyword(s):  
Host Gene ◽  
Gastrointestinal Disorders ◽  
Gut Microbes ◽  
Specific Host ◽  
Specific Manner ◽  
Inflammatory Bowel ◽  
Irritable Bowel ◽  
Potential Interactions ◽  
Host Genes ◽  
Disease Specific

While the gut microbiome and host gene regulation separately contribute to gastrointestinal disorders, it is unclear how the two may interact to influence host pathophysiology. Here, we developed a machine learning-based framework to jointly analyze host transcriptomic and microbiome profiles from 416 colonic mucosal samples of patients with colorectal cancer, inflammatory bowel disease, and irritable bowel syndrome. We identified potential interactions between gut microbes and host genes that are disease-specific, as well as interactions that are shared across the three diseases, involving host genes and gut microbes previously implicated in gastrointestinal inflammation, gut barrier protection, energy metabolism, and tumorigenesis. In addition, we found that mucosal gut microbes that have been associated with all three diseases, such as Streptococcus, interact with different host pathways in each disease, suggesting that similar microbes can affect host pathophysiology in a disease-specific manner through regulation of different host genes.

A study of the correlation between chalazion and intestinal flora in chinese children

2020 ◽  
Author(s):  
Yuanyue Cui ◽  
Lei Song ◽  
Xie Li ◽  
Ting Qiu ◽  
Jing Jin ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Diversity Index ◽  
Bacterial Species ◽  
Intestinal Flora ◽  
Meibomian Gland ◽  
Control Group ◽  
Healthy Children ◽  
Gut Flora ◽  
Microbial Composition ◽  
Significant Difference

Abstract BackgroundChalazion is a chronic inflammatory granuloma of the meibomian gland formed on the basis of the obstruction of the meibomian gland drainage duct and the retention of secretions. It is one of the most common clinically eye diseases in children. Chronic inflammation of the meibomian glands is responsible for this disease, and the gut flora is thought to be involved in the inflammatory process. In this study, we investigated the relationship between intestinal microbial composition and children's chalazion.MethodsFecal samples were collected from 21 children with chalazion and 26 healthy children. DNA was extracted from fecal stool samples and 16S rRNA sequences in the gut flora were detected by using second second-generation sequencing technology. The results were used to compare the composition of the microbiome between patients and healthy controls.ResultsAccording to Alpha Diversity and Beta Diversity analysis, we found that there was no significant difference in bacteria diversity and relative abundance between the two groups. We compared the flora of the control group and the diseased group through Lefse analysis, and screened out 11 different species. Based on the absolute abundance of species, 43 different species were selected. Anosim analysis and metastats analysis were used to compare the flora of the control group and the diseased group again. At the species level, we found that gut_metagenome and human_gut_metagenome are the common differences in species levels obtained from the above analysis. Finally, corrplot correlation analysis was performed, suggesting that gut_metagenome has a great correlation with the number, ulceration, and recurrence of chalazion in children.ConclusionsThere was no significant difference in the diversity index and relative abundance of flora in children with chalazion compared with healthy children, but there were significant differences in some bacterial species. The gut_metagenome strains identified in this study were significantly related to the growth, ulceration, and relapse of children with chalazion. It is suggested that gut_metagenome may be a microbiological indicator which is independent of clinicopathologic factors but associated with chalazion disease .* These authors have contributed equally to this work.

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