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Age-dependent development of the splenic marginal zone in human infants is associated with different causes of death
Carsten Kruschinski1, Mohamed Zidan, Anette S Debertin
1Department of Functional and Applied Anatomy, Medical School of Hannover, Hannover, Germany.
Insights
Infant spleen development, particularly the marginal zone (MZ), is age-dependent. An immature spleen and MZ are linked to increased susceptibility to bacterial infections in infants, especially in cases of sudden infant death.
Area of Science:
- Immunology
- Pediatric Pathology
- Developmental Biology
Background:
- Infants exhibit heightened susceptibility to infections from encapsulated bacteria, particularly those involving T cell-independent type 2 (TI-2) polysaccharide antigens.
- Immune responses to TI-2 antigens are critically associated with the splenic marginal zone (MZ), yet its developmental trajectory in early childhood remains understudied.
- Limited data exist on the age-related development of the human spleen and its potential link to various pediatric diseases.
Purpose of the Study:
- To investigate the age-dependent development of splenic compartments in infants and young children.
- To correlate splenic development, specifically the marginal zone (MZ), with the cause of death in pediatric autopsy cases.
- To explore the association between splenic immaturity and increased susceptibility to infections in early life.
Main Methods:
- Analysis of 34 human spleen samples from autopsy cases, ranging from 12 days to 32 months of age.
- Utilized immunohistochemical labeling on paraffin-embedded spleen sections with a panel of monoclonal antibodies.
- Examined the morphology (shape and size) of white pulp compartments and correlated findings with the documented cause of death.
Main Results:
- Splenic compartment development demonstrated a statistically significant correlation with age, although no precise maturation point was identified for each compartment.
- The marginal zone (MZ) was observed to be significantly less frequent in cases of sudden infant death (SID) and/or infection compared to controls (violent/traumatic deaths).
- These findings suggest a potential link between an immature splenic MZ and increased vulnerability to bacterial infections in infants.
Conclusions:
- Splenic development, including the marginal zone (MZ), is a dynamic, age-dependent process in early childhood.
- An immature state of the spleen, particularly the MZ, may predispose infants to severe bacterial infections.
- This study underscores the importance of splenic maturation in immune defense against encapsulated bacteria during infancy.
Abstract:
Infants are more susceptible to infections caused by T cell- independent type 2 (TI-2) polysaccharide antigens of certain encapsulated bacteria. Immune responses against this type of antigen are related to the splenic marginal zone (MZ). However, only few data exist on the age-dependent developmental stages of the human spleen in early childhood and on their association with different diseases. Therefore, the present study aimed to investigate spleens of a large number of children at very young ages (12 days to 32 months), derived from autopsy cases. Immunohistochemical labeling was performed on paraffin sections of 34 spleens using a panel of monoclonal antibodies. The shape and size of the white pulp compartments were examined and correlated to the cause of death of the children. Results show that the development of the different compartments was statistically age-dependent, but no clear-cut time point for the maturity of each compartment was seen. Furthermore, the MZ was significantly more often missing when sudden infant death (SID) and/or infection were the cause of death, compared with other violent or traumatic reasons that served as controls. This association supports the concept that an immature state of the spleen and especially of the MZ might contribute to the increased susceptibility to bacterial infections in young infants.
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