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Longitudinal follow-up of lymphocyte subsets during the first year of life

Po-Nien Tsao1, Bor-Luen Chiang, Yao-Hsu Yang

  • 1Department of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.

Asian Pacific Journal of Allergy and Immunology
|February 18, 2003
PubMed

Insights

This study tracked infant lymphocyte subsets using flow cytometry. Key findings show significant increases in T, B, and NK cells during the first year of life, establishing infant immune development reference ranges.

Area of Science:

  • Immunology
  • Pediatrics
  • Developmental Biology

Background:

  • Infant immune system development is critical for lifelong health.
  • Understanding lymphocyte subset dynamics during infancy is essential for assessing immune function.

Purpose of the Study:

  • To longitudinally evaluate changes in lymphocyte subpopulations in healthy infants.
  • To establish reference ranges for lymphocyte subsets during the first year of life.

Main Methods:

  • Longitudinal study design.
  • Flow cytometric immunophenotyping of peripheral blood samples.
  • Analysis of lymphocyte subsets (CD3+, CD4+, CD8+, CD19+, NK cells) at multiple time points from birth to 11 months.

Main Results:

  • Absolute counts of CD3+, CD3+/CD4+ T lymphocytes increased from birth to 3 months, then stabilized.
  • Absolute counts of CD3+/CD8+ T lymphocytes increased from birth to 11 months.
  • Absolute counts of CD19+ B lymphocytes and NK cells showed rapid increases by 3 months and continued to rise throughout infancy.
  • Relative and absolute lymphocyte subset changes did not always correlate.

Conclusions:

  • Significant age-related changes occur in lymphocyte subpopulations during infancy.
  • Established reference ranges provide a benchmark for infant immune development.
  • Findings are crucial for clinical assessment of infant immune status.

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