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B lymphocytes in newborns

C Agostini, M Colombatti, M Sanzari

    Archivum Immunologiae Et Therapiae Experimentalis
    |January 1, 1981
    PubMed
    Summary
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    Newborn infants show normal B lymphocyte surface immunoglobulin levels but reduced ability to form rosettes. This suggests the B cell system may not be fully mature at birth.

    Area of Science:

    • Immunology
    • Neonatal Research
    • Cell Biology

    Background:

    • The development and maturation of the B lymphocyte system are crucial for establishing immune competence in newborns.
    • Understanding neonatal immune responses is vital for assessing infant health and susceptibility to infections.

    Purpose of the Study:

    • To evaluate key B lymphocyte markers in full-term newborn infants within the first four days of life.
    • To assess the functional capacity of neonatal B lymphocytes.

    Main Methods:

    • Analysis of B lymphocyte markers, including surface immunoglobulins (SmIg) and Fc receptors, in 24 newborn infants.
    • Assessment of lymphocyte ability to form rosettes with mouse erythrocytes.

    Main Results:

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  • Normal percentages of cells with surface immunoglobulins (SmIg) were observed.
  • A slight, non-significant reduction in cells bearing Fc receptors was noted.
  • A significant reduction in the ability of newborn lymphocytes to form rosettes with mouse erythrocytes was demonstrated.

    • Conclusions:

    • Neonatal B lymphocytes exhibit normal surface immunoglobulin expression.
    • The reduced rosette formation suggests that the B cell-dependent immune system may not be fully mature in the immediate postnatal period.
    • Further investigation is warranted to understand the implications of B cell immaturity for neonatal immunity.