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Fetal T-lymphocyte subpopulations in normal pregnancies
B Thilaganathan1, C A Mansur, G Morgan
1Harris Birthright Research Centre for Fetal Medicine, King's College Hospital School of Medicine, London, UK.
Fetal Diagnosis and Therapy
|January 1, 1992
Summary
Fetal T lymphocyte counts, including total T cells (CD3+) and T-helper cells (CD4+), increase with gestation. These changes reflect the developing fetal immune system and its cell-mediated immunity maturation.
Area of Science:
- Immunology
- Developmental Biology
- Fetal Medicine
Background:
- The fetal immune system undergoes significant development during gestation.
- Understanding T lymphocyte subpopulation dynamics is crucial for assessing fetal immune maturation.
Purpose of the Study:
- To quantify changes in peripheral blood T lymphocyte subpopulations in fetuses.
- To correlate these changes with gestational age and immune system development.
Main Methods:
- Analysis of fetal blood samples using fluorescence-activated cell sorting.
- Measurement of T lymphocyte subpopulations (CD3+, CD4+, CD8+) and their percentages/numbers.
- Correlation of T lymphocyte data with gestational age.
Main Results:
- Total T lymphocytes (CD3+) and T-helper lymphocytes (CD4+) increased exponentially with gestation.
- Suppressor/cytotoxic T lymphocytes (CD8+) increased linearly with gestation.
- The helper-to-suppressor T lymphocyte ratio (CD4/CD8) showed an exponential increase with gestation.
Conclusions:
- Fetal T lymphocyte subpopulations change significantly throughout gestation.
- These alterations indicate the maturation and development of the fetal cell-mediated immune system.
- Observed changes in T lymphocyte markers (CD45RA, L-selectin, CD25, HLA-DR) further support immune system development.