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Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

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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...
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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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The small intestine exhibits a unique histological structure that significantly enhances its function in digestion and nutrient absorption. These structures include circular folds, villi, and various specialized cells that collectively facilitate the digestion of food.
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Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

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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.
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Inflammatory Bowel Disease II: Crohn's Disease01:30

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Introduction
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
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Integrated Multi-Omic Analysis Identifies Altered Colonic Brush Border Profile as a Key Feature of Microscopic Colitis.

United European gastroenterology journal·2025
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Heterogeneity in Histological Evaluation of Microscopic Colitis in Randomized Clinical Trials: An Umbrella Review.

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Hippo Signaling Regulates High-NaCl-Induced Increase in RORγt+ Pro-Inflammatory Lymphocytes.

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Lymphocytic colitis can be transcriptionally divided into channelopathic and inflammatory lymphocytic colitis.

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Human Leukocyte Antigen Signatures as Pathophysiological Discriminants of Microscopic Colitis Subtypes.

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The Process of Developing a Disease Activity Index in Microscopic Colitis.

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Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
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Dissecting Microscopic Colitis Immunopathophysiology: Insights From Basic Research.

Andreas Münch1,2, Celia Escudero-Hernández3

  • 1Department of Gastroenterology and Hepatology, Linköping University, Linköping, Sweden.

United European Gastroenterology Journal
|May 3, 2025
PubMed
Summary
This summary is machine-generated.

Microscopic colitis, an inflammatory bowel disease (IBD), includes collagenous and lymphocytic colitis. Differentiating these conditions using multiomics may enable precision medicine for IBD.

Keywords:
HLAgenescollagenous colitisimmunopathophysiologyinflammatory bowel disease (IBD)lymphocytic colitismalabsorptionmicroscopic colitismultiomic approachesprecision medicine

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Area of Science:

  • Gastroenterology and Immunology
  • Inflammatory Bowel Disease Research

Background:

  • Microscopic colitis (MC) encompasses collagenous colitis (CC) and lymphocytic colitis (LC), two clinically similar IBD entities.
  • CC is linked to HLA genes and exhibits a Th1/Tc1-Th17/Tc17 immune profile with myofibroblast activity and water malabsorption.
  • LC lacks genetic associations, shows a Th1/Th2 profile, and involves altered paracellular/transcellular permeability, with subtypes including channelopathic and inflammatory LC.

Purpose of the Study:

  • To differentiate between collagenous colitis and lymphocytic colitis as distinct entities within microscopic colitis.
  • To explore microscopic colitis as a model for early inflammatory bowel disease (IBD) stages.
  • To investigate the potential of multiomic approaches and biobanks for patient stratification and precision medicine in MC.

Main Methods:

  • Comparative analysis of clinical and immunological profiles of collagenous colitis and lymphocytic colitis.
  • Exploration of genetic associations and immune cell activity in MC subtypes.
  • Proposed utilization of multiomic approaches and biobanks for MC research.

Main Results:

  • Collagenous colitis associates with HLA genes and shows specific immune profiles and functional alterations (e.g., water malabsorption).
  • Lymphocytic colitis lacks genetic associations and exhibits distinct permeability and immune profiles, with specific subtypes.
  • Microscopic colitis offers a model for early IBD due to intact mucosa and seemingly inactive immune cells.

Conclusions:

  • Distinguishing between collagenous colitis and lymphocytic colitis is crucial for understanding MC pathogenesis.
  • Microscopic colitis serves as an ideal model for studying early IBD development.
  • Multiomic strategies and biobanks are essential for validating MC patient stratification and advancing precision medicine.