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Antigen-binding cells in human fetal liver.

I M Roberts, S Whittingham, D C Cowling

    International Archives of Allergy and Applied Immunology
    |January 1, 1975
    PubMed
    Summary

    Researchers detected antigen-binding cells (ABC) in human fetal liver tissue using autoradiography. These cells, crucial for immune responses, peaked in abundance around 10-12 weeks of gestation.

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    Area of Science:

    • Immunology
    • Developmental Biology
    • Hematology

    Background:

    • Antigen-binding cells (ABC) are key players in adaptive immunity.
    • Understanding early immune cell development in human fetuses is crucial for developmental immunology.
    • Previous studies have identified similar cells in fetal mouse liver.

    Purpose of the Study:

    • To detect and characterize antigen-binding cells (ABC) in human fetal liver.
    • To investigate the developmental timing and specificity of these early immune cells.
    • To explore the potential relationship between fetal liver ABC and B cell precursors.

    Main Methods:

    • Autoradiography was used to detect ABC in human fetal liver samples (8-24 weeks gestation).
    • Radioiodine-labeled thyroglobulin was employed as the primary antigen.
    • Specificity of binding was assessed using inhibition assays with unlabeled thyroglobulin and other antigens.

    Main Results:

    • ABC were consistently detected in the haemic cells of human fetal liver.
    • ABC counts ranged from 5.0 to 24.3 per 1,000 cells, with a peak observed at 10-12 weeks of gestation.
    • Binding was specific to thyroglobulin and could be inhibited by excess unlabeled thyroglobulin, suggesting antigen recognition.

    Conclusions:

    • The human fetal liver harbors antigen-binding cells during early development.
    • These cells exhibit specificity for thyroglobulin, indicating a role in immune surveillance or development.
    • The findings suggest that these ABC may represent early precursors of B cells, aligning with observations in fetal mouse models.

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