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Complement system studies in adult coeliac disease
Insights
Adult coeliac disease involves complement system activation, particularly the classical pathway, linked to gluten intake. Dietary gluten reduction significantly lowers complement activation products in these patients.
Area of Science:
- Immunology
- Gastroenterology
- Complement System Biology
Background:
- Coeliac disease is an autoimmune disorder triggered by gluten ingestion.
- The role of the complement system in coeliac disease pathogenesis is not fully understood.
Purpose of the Study:
- To investigate complement system activation in adult coeliac disease patients.
- To determine the association between gluten ingestion and complement activity.
Main Methods:
- Studied complement activation products (C3, Factor B) and levels (C4, C3) in 22 adult coeliac disease patients.
- Compared findings in untreated patients and those on a gluten-free diet.
Main Results:
- All untreated patients showed C3 activation products; 4 had alternate pathway factor B activation.
- Lowered C4 and C3 levels were observed, with C4 depression being statistically significant.
- Circulating C3 activation products decreased significantly on a gluten-free diet.
Conclusions:
- Evidence suggests classical pathway complement activation in adult coeliac disease.
- Gluten ingestion is associated with increased complement activity.
- Complement activation by a humoral immune response to gluten may contribute to intestinal tissue injury.
Abstract:
Detailed complement system studies were performed in 22 patients with adult coeliac disease. Activation products of C3 were observed in the fresh sera of all untreated patients, while only 4 had activation products of factor B of the alternate pathway. Levels of C4 and C3 were lower than normal mean, but only the depression of C4 reached a level of statistical significance. The amounts of circulating C3 activation products were significantly reduced when the patients were on a gluten-free diet. There is thus evidence that activation of the classical pathway of the complement system takes place in adult coeliac disease, and there is an association between gluten ingestion and the complement activity. We suggest that a possible mechanism of tissue injury in this disease is activation of complement factors by a humoral immune reaction to dietary gluten in the intestinal wall.