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Lymphocyte subsets identified by monoclonal antibodies in healthy children
Insights
Pediatric immune development shows significant changes in lymphocyte subsets and monocytes. Key cell populations like Leu-2a+ and Leu-7+ cells increase with age, while others, such as Leu-3a+ cells, decrease.
Area of Science:
- Immunology
- Pediatric Hematology
- Cell Biology
Background:
- The immune system undergoes significant development during childhood.
- Understanding the dynamics of lymphocyte and monocyte populations is crucial for assessing immune health in children.
- Previous research has indicated age-related changes in immune cell distributions, but detailed analysis across a wide pediatric age range is needed.
Purpose of the Study:
- To quantitatively analyze the age-related distribution of lymphocyte subsets and monocytes in the peripheral blood of normal children.
- To identify specific immune cell populations that exhibit significant changes during childhood development.
- To establish normative data for immune cell profiles in pediatric populations.
Main Methods:
- Quantitative immunofluorescence analysis was employed using monoclonal antibodies.
- Peripheral blood mononuclear leukocytes were isolated from 72 healthy children aged 2 months to 13.5 years.
- Flow cytometry was used to enumerate distinct lymphocyte subsets (e.g., Leu-2a+, Leu-3a+, Leu-7+) and monocyte populations (e.g., Leu-M3+).
Main Results:
- Total leukocyte counts and peripheral blood mononuclear leukocyte percentages/absolute numbers decreased with age.
- Significant age-related increases were observed in the percentages of Leu-2a+ (cytotoxic/suppressor T cells), Leu-7+ (NK cells/some T cells), and Leu-M3+ (monocytes) cells.
- Conversely, percentages of Leu-3a+ (helper T cells), Leu-4+ (pan T cells), and 2H7+ (some B cells/monocytes) cells significantly decreased with age, leading to a reduced Leu-3a+/Leu-2a+ ratio.
Conclusions:
- The distribution of peripheral blood immune cells, particularly T cell subsets and monocytes, undergoes substantial, predictable changes throughout childhood.
- The observed shifts in immune cell populations reflect ongoing immune system maturation and adaptation in healthy children.
- These findings provide a baseline for understanding normal pediatric immune development and may aid in identifying atypical immune profiles.
Abstract:
The distributions of lymphocyte subsets and monocytes in the peripheral blood mononuclear leukocytes of 72 normal children from 2 months to 13 5/12 yr were examined using quantitative immunofluorescence analysis with monoclonal antibodies. Distinct decreases with age were found in the total leukocyte counts, the percentages and the absolute numbers of peripheral blood mononuclear leukocytes. The percentages of Leu-2a+ cells, Leu-7+ cells, and Leu-M3+ cells significantly increased with age, whereas the percentages of Leu-3a+ cells, Leu-4+ cells, and 2H7+ cells significantly decreased with age. As a result, ratios of Leu-3a+/Leu-2a+ decreased with age. No prominent differences with age were found in the proportions of Leu-10+ cells and HLA-DR+ cells.