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Lymphocyte subpopulations in healthy and unhealthy newborn babies
Insights
Newborn babies with bacterial infections show higher lymphocyte counts, with increased B lymphocytes and EA rosette-forming cells, suggesting accelerated immune maturation. T lymphocyte percentages were lower, but absolute numbers remained comparable to healthy newborns.
Area of Science:
- Immunology
- Neonatal Research
- Infectious Diseases
Background:
- Neonatal immune system development is crucial.
- Bacterial infections can significantly impact infant immunity.
- Understanding lymphocyte dynamics in neonates is vital for assessing health status.
Purpose of the Study:
- To investigate lymphocyte subpopulations in newborns with and without bacterial infections.
- To compare neonatal lymphocyte profiles with healthy adult controls.
- To determine the impact of infection on T lymphocytes, B lymphocytes, and other immune cells.
Main Methods:
- Analysis of venous blood samples from term and preterm newborns.
- Enumeration of lymphocyte subpopulations: T lymphocytes (rosette forming cells), B lymphocytes (surface immunoglobulin bearing cells), active rosette forming cells (Ea cells), EAC cells, and EA cells.
- Comparison between infected newborns, non-infected newborns, and healthy adults.
Main Results:
- Infected newborns had higher overall lymphocyte counts per microliter compared to non-infected newborns and adults.
- Absolute B lymphocyte numbers were significantly elevated in infected newborns.
- Active rosette forming cells and EAC cells mirrored T lymphocyte behavior, while EA rosette-forming cells increased in infected infants.
Conclusions:
- Elevated B lymphocytes in infected newborns suggest accelerated immune maturation.
- Increased EA rosette-forming cells may indicate a rise in K lymphocytes due to infection.
- The study highlights distinct immunological responses in neonates facing bacterial infections.
Abstract:
The Authors report the data of a study of lymphocyte subpopulations (T lymphocytes as rosette forming cells, B lymphocytes as surface immunoglobulin bearing cells, Ea cells as active rosette forming cells, EAC cells, with a receptor for complement, and EA cells, with a receptor for Fc fragment) in venous blood of a group of newborn babies including at term and preterm subjects and babies with and without bacterial infections. A group of healthy adults was also examined as control. Main findings were the following: a) in the group of newborn babies with infection the number of lymphocytes/microliter was higher as compared to that of newborn babies without infections and of adult controls; b) the percentage of T lymphocytes was significantly lower in the two groups of newborn but the absolute number was comparable; c) active rosette forming cells behaved as T lymphocytes; d) absolute number of B lymphocytes was significantly higher in newborn babies with infection as compared to newborn babies without infection and adult controls; e) newborn with infections showed also higher absolute number of EA rosette; f) EAC rosette behaved as T lymphocytes and active rosette forming cells. The increase of B lymphocytes in babies with infection is interpreted as an acceleration of the maturation of lymphocyte populations toward the pattern of older ages. The increase of EA rosette forming cells is tentatively interpreted as an increase of K lymphocytes fostered by infection.