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Related Concept Videos

Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

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The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
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Irritable Bowel Syndrome I: Introduction01:17

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Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
IBS is a chronic condition that can persist over a long period or recur frequently.
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Gastrointestinal Motility Disorders01:20

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Gastrointestinal or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
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Gut-Brain Axis01:22

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The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
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Microbiota of the Stomach and Small Intestine01:27

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The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
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Microbiota of the Large Intestine01:27

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The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
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The Intestinal Microenvironment and Functional Gastrointestinal Disorders.

Giovanni Barbara1, Christine Feinle-Bisset2, Uday C Ghoshal3

  • 1Department of Medical and Surgical Sciences, School of Medicine, University of Bologna, Italy.

Gastroenterology
|May 5, 2016
PubMed
Summary

Functional gastrointestinal disorders involve complex interactions. Research is increasingly exploring luminal factors like diet and gut microbiota, alongside the gut-brain axis, for better management strategies.

Keywords:
bile acidsfoodfunctional dyspepsiaimmune systemirritable bowel syndromemicrobiotaserotonin

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Area of Science:

  • Gastroenterology and Neurogastroenterology
  • Functional Gastrointestinal Disorders Research

Background:

  • Historically, research on functional gastrointestinal disorders (FGIDs) focused on the gut-brain axis.
  • Emerging evidence highlights the significance of luminal factors, including diet and gut microbiota, in FGID pathophysiology.
  • Disturbances in epithelial barrier integrity, entero-endocrine signaling, and immune activation are implicated in FGIDs.

Purpose of the Study:

  • To review the evolving understanding of FGID pathophysiology.
  • To emphasize the growing interest in luminal factors and their role in FGIDs.
  • To highlight the need for further research into micro-organic changes in FGID subgroups.

Main Methods:

  • Review of existing patient reports and clinical observations.
  • Analysis of experimental and clinical data on gut microbiota, diet, and epithelial barrier function.
  • Synthesis of evidence linking luminal factors to FGID pathogenesis.

Main Results:

  • Dietary interventions are gaining prominence in irritable bowel syndrome (IBS) management.
  • Data on the gut microbiota's role in FGIDs remain inconclusive.
  • Evidence suggests micro-organic changes in subgroups of functional dyspepsia and IBS patients.

Conclusions:

  • Luminal factors, including diet and gut microbiota, are increasingly recognized in FGID pathophysiology.
  • Further longitudinal and interventional studies are crucial to elucidate the exact role of these factors.
  • Understanding micro-organic changes may lead to improved diagnostic and therapeutic strategies for FGIDs.