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Related Concept Videos

Autoimmune Disorders01:29

Autoimmune Disorders

390
Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune...
390
Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

389
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...
389
Inflammatory Bowel Disease II: Crohn's Disease01:30

Inflammatory Bowel Disease II: Crohn's Disease

186
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...
186
Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy01:30

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

319
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...
319
Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

143
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...
143
Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

248
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...
248

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Related Experiment Video

Updated: Jun 8, 2025

Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Unequal causality between autoimmune thyroiditis and inflammatory bowel disease: a Mendelian randomization study.

Siyang Bai1,2, Yunfeng Yu1, Xinyu Yang2

  • 1Department of Digestive Endoscopy, The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan, China.

Frontiers in Endocrinology
|November 8, 2024
PubMed
Summary

Crohn's disease (CD) increases autoimmune thyroiditis (AIT) risk, but AIT does not raise inflammatory bowel disease (IBD) risk. Managing CD may help prevent AIT.

Keywords:
Crohn’s diseaseFinnGenMendelian randomizationautoimmune thyroiditisinflammatory bowel diseaseulcerative colitis

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Area of Science:

  • Genetics and Medicine
  • Immunology
  • Gastroenterology

Background:

  • Autoimmune thyroiditis (AIT) and inflammatory bowel disease (IBD) are immune-mediated conditions.
  • The potential causal relationship between AIT and IBD requires further investigation.

Purpose of the Study:

  • To investigate the bidirectional causal relationship between autoimmune thyroiditis (AIT) and inflammatory bowel disease (IBD) using Mendelian randomization (MR).

Main Methods:

  • Utilized genetic data from FinnGen for single nucleotide polymorphisms.
  • Assessed causality with inverse variance weighted, MR-Egger, and weighted median methods.
  • Evaluated pleiotropy, heterogeneity, and robustness using sensitivity analyses.

Main Results:

  • No significant association was found between AIT and ulcerative colitis (UC) or Crohn's disease (CD) risk.
  • Increased risk of AIT was associated with Crohn's disease (CD) (OR 2.371, p < 0.001).
  • Ulcerative colitis (UC) was not associated with AIT risk, and AIT was not associated with IBD risk.

Conclusions:

  • Crohn's disease (CD) is identified as a risk factor for autoimmune thyroiditis (AIT).
  • Autoimmune thyroiditis (AIT) is not a risk factor for inflammatory bowel disease (IBD).
  • Proactive management of CD may reduce the risk of developing AIT.