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Lymphocyte markers in newborn infants

T Hallberg, A Hallberg

Acta Pathologica Et Microbiologica Scandinavica. Section C, Immunology

|December 1, 1976

Summary

Newborn infants show fewer lymphocytes binding IgG compared to adults. This difference in Fc receptor expression on immune cells may impact infant immune responses.

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Area of Science:

Immunology
Neonatal immunology
Cellular immunology

Background:

Peripheral blood lymphocytes play a crucial role in immune responses.
Understanding lymphocyte surface marker expression is vital for assessing immune system development and function.
Neonatal immune systems differ from adult systems, necessitating specific investigation.

Purpose of the Study:

To investigate and compare the expression of key surface markers on peripheral blood lymphocytes between newborn infants and adults.
To identify potential differences in lymphocyte subsets and their functional markers that may influence immune responses in early life.

Main Methods:

Purification of peripheral blood lymphocytes from 20 newborn infants and 12 adults.
Analysis of sheep red blood cell (RBC)-binding cells (T-lymphocytes) and immunoglobulin (Ig)-bearing cells using the mixed antiglobulin reaction.
Quantification of lymphocytes binding the Fc portion of IgG (FcγR) to assess functional receptor expression.

Main Results:

No significant differences were observed in the percentage of sheep RBC-binding cells or Ig-bearing cells between newborns and adults.
Newborn infants exhibited a significantly lower percentage of lymphocytes binding Fc of IgG (10.4%) compared to adults (17.2%).
No overall correlation was found between plasma immunoglobulin levels and Ig-bearing lymphocytes, though one infant with elevated IgA showed the highest Ig-bearing lymphocyte count.

Conclusions:

Neonatal lymphocytes display distinct functional receptor profiles, specifically reduced Fc of IgG binding capacity, compared to adult lymphocytes.
These differences in Fc receptor expression may have implications for the efficacy of antibody-mediated immune responses in newborns.
Further research is warranted to elucidate the functional consequences of altered Fc receptor expression on neonatal immune cells.

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