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Dysbiosis in the pathogenesis of pediatric inflammatory bowel diseases
Donatella Comito1, Claudio Romano
1Pediatric Department, University of Messina, 98125 Messina, Italy.
Insights
Pediatric inflammatory bowel diseases (IBD) involve immune system dysfunction and gut microbial imbalance (dysbiosis) in genetically susceptible children. This dysbiosis, characterized by a lack of beneficial bacteria, is key to IBD development.
Area of Science:
- Immunology
- Gastroenterology
- Microbiology
Background:
- Inflammatory bowel diseases (IBD), including Crohn's disease (CD) and ulcerative colitis (UC), are chronic gastrointestinal inflammatory conditions.
- Pediatric IBD, representing 20-25% of cases, offers a valuable model for studying immunopathogenic mechanisms.
- IBD pathogenesis involves defective innate immunity, impaired bacterial killing, and an overaggressive adaptive immune response.
Purpose of the Study:
- To elucidate the role of gut microbial dysbiosis in the pathogenesis of pediatric inflammatory bowel diseases.
- To highlight the interplay between genetic predisposition and microbial alterations in IBD development.
Main Methods:
- Review of current understanding of IBD pathogenesis, focusing on immune responses and gut microbiota.
- Analysis of the composition and function of the human gastrointestinal microbial ecosystem in health and disease.
Main Results:
- A condition of dysbiosis, marked by alterations in gut microbial composition, is considered fundamental to IBD pathogenesis.
- Healthy gut microbiota maintain a symbiotic relationship with the host, performing essential metabolic, barrier, and immune functions.
- In pediatric IBD, microbial dysbiosis, characterized by a deficiency in beneficial bacteria, is a critical factor alongside genetic susceptibility.
Conclusions:
- Gut microbial dysbiosis is a central element in the pathogenesis of pediatric inflammatory bowel diseases.
- Understanding the complex interplay between host genetics and the gut microbiome is crucial for addressing IBD.
Abstract:
Inflammatory bowel diseases (IBDs) are chronic inflammatory conditions of the gastrointestinal tract that occur in genetically susceptible individuals. Crohn's disease (CD) and ulcerative colitis (UC) are two major types of IBD. In about 20-25% of patients, disease onset is during childhood and pediatric IBD can be considered the best model for studying immunopathogentic mechanisms. The fundamentals of IBD pathogenesis are considered a defective innate immunity and bacterial killing with overaggressive adaptive immune response. A condition of "dysbiosis", with alterations of the gut microbial composition, is regarded as the basis of IBD pathogenesis. The human gastrointestinal (GI) microbial population is a complex, dynamic ecosystem and consists of up to one thousand different bacterial species. In healthy individuals, intestinal microbiota have a symbiotic relationship with the host organism and carry out important metabolic, "barrier," and immune functions. Microbial dysbiosis in IBD with lack of beneficial bacteria, together with genetic predisposition, is the most relevant conditions in the pathogenesis of the pediatric IBD.
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