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Related Concept Videos

Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

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.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
Irritable Bowel Syndrome01:23

Irritable Bowel Syndrome

DefinitionIrritable bowel syndrome (IBS) is a functional gastrointestinal disorder characterized by recurrent combinations of abdominal pain, bloating, diarrhea, or constipation.Pathophysiology of irritable bowel syndromeIts pathophysiology is multifactorial, involving disturbances in motility, sensory processing, microbial balance, barrier integrity, and gut–brain communication. These mechanisms interact to produce symptoms that vary across IBS subtypes.Altered Motility PatternsDisordered...
Dysbiosis of the Gut Microbiota01:18

Dysbiosis of the Gut Microbiota

The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

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...
Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

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,...
Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...

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Related Experiment Video

Updated: Jun 8, 2026

Perturbations of Circulating miRNAs in Irritable Bowel Syndrome Detected Using a Multiplexed High-throughput Gene Expression Platform
10:37

Perturbations of Circulating miRNAs in Irritable Bowel Syndrome Detected Using a Multiplexed High-throughput Gene Expression Platform

Published on: November 30, 2016

[Microbiota and irritable bowel syndrome].

P Ducrotté1

  • 1ADEN EA 4311/IFRMP 23, Department of Hepatogastroenterology and Nutrition, Regional University Hospital, Charles Nicolle Hospital, 1 Rue de Germont, Rouen Cedex, France. philippe.ducrotte@chu-rouen.fr

Gastroenterologie Clinique Et Biologique
|October 5, 2010
PubMed
Summary

Irritable bowel syndrome (IBS) involves gut microbiota changes, potentially triggered by infections or leading to abnormal fermentation. Research highlights these microbial shifts, suggesting prebiotics, probiotics, and antibiotics as potential IBS treatments.

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Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

Published on: May 2, 2018

Related Experiment Videos

Last Updated: Jun 8, 2026

Perturbations of Circulating miRNAs in Irritable Bowel Syndrome Detected Using a Multiplexed High-throughput Gene Expression Platform
10:37

Perturbations of Circulating miRNAs in Irritable Bowel Syndrome Detected Using a Multiplexed High-throughput Gene Expression Platform

Published on: November 30, 2016

Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing

Published on: October 15, 2019

Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach
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Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach

Published on: May 2, 2018

Area of Science:

  • Gastroenterology
  • Microbiology
  • Immunology

Context:

  • Irritable bowel syndrome (IBS) is a complex gastrointestinal disorder.
  • The gut microbiota's role in IBS pathophysiology is increasingly recognized.
  • Post-infectious IBS, following bacterial gastroenteritis, affects nearly 20% of patients.

Purpose:

  • To explore the pathophysiological role of the gut microbiota in IBS.
  • To review evidence linking gut microbiota alterations to IBS symptoms and mechanisms.
  • To discuss novel therapeutic strategies for IBS targeting the gut microbiota.

Summary:

  • Abnormal colonic fermentation in IBS patients may cause bloating and visceral hypersensitivity.
  • Significant differences exist in luminal and mucosa-associated microbiota between IBS patients and controls.
  • Evidence suggests small intestinal bacterial overgrowth (SIBO) in a subset of IBS patients.

Impact:

  • Findings support considering the gut microbiota as a key factor in IBS development and progression.
  • Highlights the potential of prebiotics, probiotics, and antibiotics as novel therapeutic interventions for IBS.
  • Emphasizes the need for further research into microbiota-targeted therapies for improved IBS management.