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Fistulizing Crohn's Disease
Michael Scharl1, Gerhard Rogler1, Luc Biedermann1
1Division of Gastroenterology and Hepatology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
Insights
Crohn
Area of Science:
- Gastroenterology and Immunology
- Cell Biology
- Microbiome Research
Background:
- Fistulas are a significant complication in Crohn's disease (CD), affecting at least one-third of patients.
- Long-term remission of complex fistulas is achieved in only about one-third of affected individuals.
- The precise pathogenesis of fistula development in CD remains incompletely understood.
Purpose of the Study:
- To review the current understanding of fistula pathogenesis in Crohn's disease.
- To discuss diagnostic methods and current treatment strategies for fistulas.
- To explore emerging therapeutic approaches for Crohn's disease fistulas.
Main Methods:
- Literature review of fistula pathogenesis, diagnosis, and treatment in Crohn's disease.
- Analysis of histopathological findings, molecular pathways (e.g., epithelial-to-mesenchymal transition), and inflammatory markers (TNF, IL-13, TGFβ).
- Evaluation of diagnostic modalities including clinical assessment, imaging (MRI), and endoscopy.
Main Results:
- Epithelial-to-mesenchymal transition (EMT) is implicated as a driving force in fistula development.
- Elevated levels of TNF, IL-13, and TGFβ are observed around fistulas, with a potential role for intestinal microbiota.
- Current treatments include antibiotics, immunosuppressives, and anti-TNF agents, but efficacy is often limited, necessitating surgery.
Conclusions:
- Fistula management in Crohn's disease requires a comprehensive approach combining diagnosis and treatment.
- Novel therapies, such as mesenchymal stem cells, show promise but require further investigation.
- Continued research into fistula pathogenesis is crucial for developing more effective treatments and improving patient outcomes.
Abstract:
Fistulas still represent one of the most important complications in patients with Crohn's disease (CD). At least one third of CD patients suffer from fistulas during their disease course and amongst them longstanding remission of complex fistulas occurs only in about one third. So far, fistula pathogenesis is only partially understood. From a histopathological view, a fistula is a tube covered by flat epithelial cells. Current research suggests that the driving force for fistula development is epithelial-to-mesenchymal transition (EMT). Around the fistula, high levels of tumor necrosis factor (TNF), IL-13, and TGFβ can be detected and recent studies indicated an involvement of the intestinal microbiota. Fistula diagnosis requires clinical and surgical assessment, radiologic investigations, e.g., magnet resonance imaging and endoscopy. Routine medical treatment of fistulas includes antibiotics, immunosuppressives, and anti-TNF antibodies. There is no well-established role for calcineurin inhibitors in fistula treatment, corticosteroids appear to be even contra-productive. A promising novel approach might be the application of adipose tissue-derived or bone marrow-derived mesenchymal stem cells that have been studied recently. Due to insufficient efficacy of medical treatment and recurrence of fistulas, surgical interventions are frequently necessary. Further research is needed to better understand fistula pathogenesis aiming to develop novel treatment option for our patients.
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