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  3. Role of the intestinal epithelium and the innate immune response
Gastroenterology

Role of the intestinal epithelium and the innate immune response

IBD
Gastroenterology

The dysbiosis observed in IBD could be related to an alteration of the gut epithelium, which is no longer able to play its barrier role, as well as to a dysregulation of the local innate immune response that promotes inflammation. Explanations and focus on antimicrobial peptides.

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Rôle de l’épithélium intestinal image

Intestinal epithelium

About this article

Created 17 September 2019
Updated 12 October 2021

The alteration of the intestinal barrier observed in patients with IBD could explain the pathophysiology of dysbiosis: not only would this mechanical frontier be altered, but also its first line of immune defense.

Besides its role in the absorption of ions, water and other nutrients, the intestinal barrier serves as a wall and prevents the entry of bacteria into the gut lumen. But its permeability increases in acute phases of Crohn’s disease (CD), which promotes translocation of bacteria through the mucus as well as local inflammation.5

The role of the instestinal barrier

Potential causes: alteration of the tight junctions of intestinal epithelial cadherins (glycoproteins playing a key role in intracellular adherence); involvement of some transcription factors11 related to epithelial regeneration. Other mechanisms under discussion involve the gut mucus, whose thickness keeps pathogenic bacteria at bay, but which is considerably decreased in patients with IBD. This phenomenon could be explained by the alteration of mucus- producing goblet cells whose disruption induces the development of colitis in murine models. It could also be explained in patients with CD by the impairment of Paneth cells located at the bottom of small intestinal crypts, known to be involved in homeostasis and with a defensive role of the gut mucus through antimicrobial secretion.5,11

First line of defense of the immune system

The scientific literature also mentions several mechanisms involving innate immunity, and more precisely dendritic cells, macrophages, innate lymphoid cells and neutrophils. These cells, which complete the previously described system, act as the first line of defense of the immune system. In the intestines of healthy subjects, macrophages are hyporeactive (reduced proliferation and activity) and can produce anti-inflammatory cytokines.11 On the contrary, in patients with IBD, the imbalance in innate immunity cell populations could be associated to several phenomena:11 bacteria crossing the mucus which became permeable due to macrophage activity decrease and defective neutrophil recruitment; inflammation induced by the production of large quantities of pro-inflammatory cytokines (TNF-α and IL-6) by specific macrophages; and inflammatory T-cell recruitment through the accumulation of dendritic cells which induce an adaptive immune response.

Image
Role of the intestinal epithelium infography
Image
Focus on the role of antimicrobial peptides
Sources

11 Ramos GP, Papadakis KA. Mechanisms of Disease: Inflammatory Bowel Diseases. Mayo Clin Proc. 2019;94(1):155-165.

Tags
Dysbiosis Ulcerative Colitis IBD Gut health Crohn's disease

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    Focus
    Chronical inflammatory bowel diseases (IBD)
    • Dysbiosis in IBD
      • A bacterial dysbiosis characteristic of IBD
      • Each IBD has its own virome
      • Association between fungal dysbiosis and environment
    • Pathophysiology of dysbiosis
      • Role of the intestinal epithelium and the innate immune response
      • Focus on the role of antimicrobial peptides
    • What role could microbiota modulation play?
      • Fecal microbiota transplant: mixed results
      • Use of probiotics
    • Expert opinion
      • Pr. Philippe Seksik: Towards an innovative management of IBD
    Created 17 September 2019
    Updated 12 October 2021

    About this article

    To know more about this topic.

    Main topic

    IBD

    Medical practice

    Gastroenterology

    Content type

    Dossier detail
    Association between fungal dysbiosis and environment
    Focus on the role of antimicrobial peptides
    Focus

    Chronical inflammatory bowel diseases (IBD)

    Dysbiosis in IBD

    A bacterial dysbiosis characteristic of IBD Each IBD has its own virome Association between fungal dysbiosis and environment

    Pathophysiology of dysbiosis

    Role of the intestinal epithelium and the innate immune response Focus on the role of antimicrobial peptides

    What role could microbiota modulation play?

    Fecal microbiota transplant: mixed results Use of probiotics

    Expert opinion

    Pr. Philippe Seksik: Towards an innovative management of IBD
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    L’axe intestin-cerveau dans le stress lié à la discrimination
    20.03.2023

    The gut-brain axis and discrimination-related stress

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    The role of Bifidobacteria in irritable bowel syndrome (IBS)

    Read the article
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    Positive impact of running on gut microbiota and adolescent depression

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