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Related Concept Videos

Inflammatory Bowel Disease III: Crohn's Disease01:25

Inflammatory Bowel Disease III: Crohn's Disease

Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...
Inflammatory Bowel Disease II: Ulcerative Colitis01:20

Inflammatory Bowel Disease II: Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory disorder of the colon characterized by continuous mucosal inflammation that typically begins in the rectum and extends proximally in a uniform pattern. Its pathogenesis involves a complex interplay of genetic predisposition, immune dysregulation, and environmental influences. These factors converge to impair the colon’s epithelial defenses and promote an exaggerated inflammatory response against luminal contents.Breakdown of the Mucosal BarrierA...
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...
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...
Immunodeficiency Diseases01:25

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...
Inflammatory Bowel Disease II: Crohn's Disease01:30

Inflammatory Bowel Disease II: Crohn's Disease

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.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by transmural...

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Inflammatory bowel disease: is it a primary immunodeficiency?

Erik Glocker1, Bodo Grimbacher

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Inflammatory bowel diseases (IBD) may stem from immune system deficiencies, not just inflammation. Studying IBD in primary immunodeficiency patients offers insights into gut immune system balance.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Genetics

Background:

  • Inflammatory bowel diseases (IBD), including ulcerative colitis and Crohn's disease, are chronic conditions impacting gut health.
  • IBD is often viewed as a hyperinflammatory state due to immune system and gut bacteria interactions.
  • Emerging evidence suggests IBD might also arise from immunodeficiency, with impaired inflammatory responses.

Purpose of the Study:

  • To review and discuss primary immunodeficiencies (PIDs) associated with IBD.
  • To explore the dual nature of IBD pathogenesis: hyperinflammation versus immunodeficiency.
  • To highlight the gut as a sensitive indicator of immune dysregulation.

Main Methods:

  • Review of existing literature on IBD and PIDs.
  • Analysis of patient observations linking PIDs (e.g., Wiskott-Aldrich syndrome, IPEX) to IBD.
  • Discussion of genetic defects (e.g., IL10 signaling pathway) in immune regulation.

Main Results:

  • Certain PIDs are linked to IBD, supporting the immunodeficiency theory.
  • Defects in anti-inflammatory pathways (e.g., IL10 signaling) support the hyper-inflammatory theory.
  • The bowel's sensitivity makes IBD a valuable model for studying immune homeostasis.

Conclusions:

  • IBD pathogenesis is complex, potentially involving both hyperinflammation and immunodeficiency.
  • Primary immunodeficiencies offer critical insights into IBD development.
  • Understanding IBD is key to identifying regulators of mucosal immune balance.