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Development of humoral immunity system of the small bowel
Insights
This study reveals rapid intestinal immune system maturation in children. Immunoglobulin levels in the gut and blood develop independently, suggesting distinct developmental pathways for systemic and intestinal immunity.
Area of Science:
- Pediatric immunology
- Gastrointestinal immunology
- Developmental biology
Background:
- The maturation of the intestinal immune system is crucial for host defense.
- Understanding the developmental trajectory of immunoglobulin-producing cells in the gut is essential.
- The relationship between systemic and mucosal immunity during early childhood is not fully elucidated.
Purpose of the Study:
- To investigate the development of immunoglobulin-producing cells in the lamina propria of children.
- To compare the maturation of intestinal immunity with systemic immunoglobulin levels.
- To determine the independence of systemic and intestinal immune system development.
Main Methods:
- Intestinal biopsies were obtained from 24 healthy children (2 months to 6 years) using a pediatric Crosby's capsule.
- The number of immunoglobulin-producing cells in the lamina propria was quantified using planimetry.
- Serum immunoglobulin A (IgA), IgM, and IgG levels were measured and correlated with cellular counts.
Main Results:
- Infants under 12 months showed higher IgM-producing cells and a lower IgA/IgM ratio, which normalized after 1 year, indicating rapid maturation.
- No correlation was found between serum immunoglobulin levels and the number of immunoglobulin-producing cells in the lamina propria.
- These findings suggest limited contribution of the intestinal lymphoid tissue to the systemic immunoglobulin pool.
Conclusions:
- The intestinal immune system matures rapidly within the first year of life.
- Systemic and intestinal immune system maturation appear to be independent processes.
- The gut's role in producing systemic immunoglobulins is minimal.
Abstract:
The study was performed in 24 children aged 2 months to 6 years, without intestinal or immunological diseases. Intestinal biopsies were obtained by a Crosby's capsule, pediatric size. The number of immunoglobulin forming cells of lamina propria was measured by planimetry. Under 12 months of age there are increased levels of IgM forming cells and a low IgA forming cells/IgM forming cells quotient, but over 1 year the difference disappears. This suggests that the maturity process is very rapid. There are no correlation between serum IgA, IgM, and IgG levels and its respective forming cells number of lamina propria. It seems to support that the participation of intestinal lymphoid tissue in serum pool of immunoglobulin is very poor and that systemic and intestinal immunity maturation are completely independent.