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Related Concept Videos

Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
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...
Inflammatory Bowel Disease I: Introduction01:26

Inflammatory Bowel Disease I: Introduction

Inflammatory bowel disease is a group of chronic disorders marked by recurrent inflammation of the gastrointestinal tract due to an abnormal immune response against gut microflora. This leads to tissue damage. The two main forms are Crohn’s disease and ulcerative colitis.Crohn’s DiseaseCrohn’s disease is a relapsing inflammatory disorder that can affect any part of the GI tract, from the mouth to the anus. It involves all layers of the bowel wall (transmural) and shows “skip lesions” in which...
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,...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

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...
Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy01:30

Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy

Various diagnostic tests are employed in the diagnostic process for Inflammatory Bowel Disease (IBD), particularly to differentiate between Crohn's disease and ulcerative colitis.
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the colonic...

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Chronic Salmonella Infection Induced Intestinal Fibrosis
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The gut microbiota in IBD.

Chaysavanh Manichanh1, Natalia Borruel, Francesc Casellas

  • 1Digestive System Research Unit, University Hospital Vall d'Hebron, Barcelona, Spain.

Nature Reviews. Gastroenterology & Hepatology
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Inflammatory Bowel Disease (IBD), including ulcerative colitis and Crohn's disease, is a growing global health issue. Research suggests lifestyle changes linked to socioeconomic development may alter gut microbiota, potentially contributing to IBD development.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Microbiology

Background:

  • Inflammatory Bowel Disease (IBD), encompassing ulcerative colitis and Crohn's disease, presents a growing worldwide epidemic.
  • Increased IBD incidence correlates with environmental factors associated with socioeconomic development and lifestyle changes in developed nations.
  • Altered gut microbial colonization patterns due to modern lifestyles may impair immune system regulation.

Purpose of the Study:

  • To explore the role of gut microbiota in the pathogenesis of Inflammatory Bowel Disease (IBD).
  • To investigate the link between environmental factors, gut dysbiosis, and immune dysregulation in IBD.
  • To leverage advancements in gene sequencing and bioinformatics for a deeper understanding of the gut microbiome's impact on IBD.

Main Methods:

  • Utilized advanced gene-sequencing technologies to analyze gut microbial composition.
  • Employed powerful bioinformatic tools to study microbial communities.
  • Examined the relationship between microbiota, immune responses, and mucosal lesions in IBD patients.

Main Results:

  • Studies reveal dysbiosis and reduced complexity of the gut microbial ecosystem in patients with Crohn's disease and ulcerative colitis.
  • An excessive or dysregulated immune response against commensal microbes is implicated in IBD mucosal lesions.
  • Genetic susceptibility in individuals may interact with abnormal microbial colonization to trigger IBD.

Conclusions:

  • Gut microbiota dysbiosis is a common feature in IBD patients.
  • The precise causal relationship between gut microbiota changes and IBD development requires further investigation.
  • Environmental and lifestyle factors significantly influence the gut microbiome and immune homeostasis, potentially contributing to IBD.