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Macrophages Versus Escherichia coli: A Decisive Fight in Crohn's Disease
Anthony Buisson1, Marie-Agnès Bringer, Nicolas Barnich
1*Clermont Université, UMR 1071 Inserm/Université d'Auvergne, USC-INRA 2018, Clermont-Ferrand, France; †Department of Hepato-Gastroenterology, University Hospital Estaing of Clermont-Ferrand, Université d'Auvergne, Clermont-Ferrand, France; and ‡INRA UMR1324, CNRS UMR6265, University of Bourgogne Franche-Comté, Centre des Sciences du Goût et de l'Alimentation, Dijon, France.
Insights
This review explores the role of intestinal macrophages in Crohn's disease (CD) pathogenesis. Targeting these immune cells offers a promising strategy to improve gut health and alter the disease
Area of Science:
- Immunology
- Gastroenterology
- Microbiology
Background:
- Crohn's disease (CD) pathophysiology is not fully understood, limiting treatment options.
- Current hypotheses suggest CD arises from aberrant interactions between gut microbiota and the host immune system.
- Intestinal macrophages are increasingly implicated in CD etiology, with increased numbers and granuloma formation observed in patients.
Purpose of the Study:
- To review the current understanding of intestinal macrophage function in Crohn's disease.
- To examine the interaction between macrophages and CD-associated Escherichia coli.
- To discuss the impact of existing CD therapies on intestinal macrophages.
Main Methods:
- Literature review of experimental and genetic evidence.
- Analysis of studies focusing on macrophage roles in CD.
- Examination of macrophage-pathogen interactions and therapeutic effects.
Main Results:
- Macrophages are central players in the inflammatory processes of Crohn's disease.
- Defective macrophage responses to pathogens like Escherichia coli may contribute to CD.
- CD therapies can influence macrophage behavior and function.
Conclusions:
- Modulating intestinal macrophages presents a potential therapeutic avenue for Crohn's disease.
- Targeting macrophages could lead to significant advancements in altering the intestinal damage in CD.
- Further research into macrophage modulation may promote gut health and improve patient outcomes.
Abstract:
The pathophysiology of Crohn's disease (CD), a chronic inflammatory bowel disease, remains imperfectly elucidated. Consequently, the therapeutic armamentarium remains limited and has not changed the natural history of CD hitherto. Accordingly, physicians need to identify new therapeutic targets to be able to alter the intestinal damage. The most recent hypothesis considered CD as resulting from an abnormal interaction between microbiota and host immune system influenced by genetics and environmental factors. Several experimental and genetic evidence point out intestinal macrophages in CD etiology. An increase of macrophages number and the presence of granulomas are especially observed in the intestinal mucosa of patients with CD. These macrophages could be defective and particularly in responses to infectious agents like CD-associated Escherichia coli. This review focuses on, what is currently known regarding the role of macrophages, macrophages/E. coli interaction, and the impact of CD therapies on macrophages in CD. We also speculate that macrophages modulation could lead to important translational implications in CD with the end goal of promoting gut health.
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