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T cell subclasses in fetal human ileum.

J Spencer, S B Dillon, P G Isaacson

    Clinical and Experimental Immunology
    |September 1, 1986
    PubMed
    Summary
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    T cells, including suppressor/cytotoxic types (CD8+), are present in the fetal human ileum by 11-19 weeks gestation. These immune cells appear in the gut epithelium and lamina propria during early development.

    Area of Science:

    • Immunology
    • Developmental Biology
    • Gastroenterology

    Background:

    • The presence and role of lymphocytes in the developing human gut are not fully understood.
    • Investigating early immune cell populations in the fetal intestine is crucial for understanding gut immunity.

    Purpose of the Study:

    • To determine the appearance of T cells in the fetal human small intestine.
    • To investigate the role of enteric antigens in the accumulation of suppressor/cytotoxic T cells within the gut epithelium.

    Main Methods:

    • Immunocytochemistry was used to study lymphocytes in fetal human ileum specimens.
    • T cell populations were identified using specific markers: UCHT1 (CD3) for pan T cells, UCHT4 (CD8) for suppressor/cytotoxic phenotype, and leu3a (CD4) for helper/inducer phenotype.

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    Main Results:

    • Pan T cells (UCHT1+) were found in all fetal ileum specimens (11-19 weeks gestation).
    • Suppressor/cytotoxic T cells (UCHT4+) were more prevalent than helper/inducer T cells (leu3a+) in the fetal gut epithelium.
    • UCHT1+ cells were also observed in the lamina propria, often in aggregates beneath the epithelium.

    Conclusions:

    • T cells are established in the fetal human ileum early in development.
    • The suppressor/cytotoxic T cell phenotype is prominent in the fetal gut epithelium, suggesting a potential role in immune regulation.
    • Further research is needed to elucidate the specific functions and antigen-driven accumulation of these early immune cells.