[The cecum lymphoid structure in preterm and full term newborns]

Area of Science:

• Immunology
• Developmental Biology
• Gastroenterology

Background:

• The coecum's lymphoid structures play a crucial role in immune responses to ingested antigens.
• Understanding the developmental trajectory of these structures is vital for assessing neonatal immune readiness.

Purpose of the Study:

• To quantitatively and qualitatively analyze the cellular composition of coecal lymphoid structures in full-term and premature newborns.
• To compare the developmental status of lymphoid tissues in premature versus full-term infants at birth.

Main Methods:

• Quantitative and qualitative statistical analysis of cellular content.
• Histological examination of lymphoid nodules in the coecum.

Main Results:

• A redistribution of cells within lymphoid nodules occurs from 7.5 months gestation to birth, with decreased concentration near the lumen and increased density at the nodule base.
• By birth, there is a decrease in small lymphocytes and an increase in medium lymphocytes, plasma cells, granulocytes, macrophages, and blasts.
• Premature newborns exhibit incomplete development of these lymphoid structures.

Conclusions:

• The cellular composition of coecal lymphoid structures undergoes significant changes during late gestation.
• Premature newborns have immature lymphoid structures, indicating a reduced capacity to handle food antigens compared to full-term infants.