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Expression of the costimulator molecules, CD80, CD86, CD28, and CD152 on lymphocytes from neonates and young children

S R Elliott1, P J Macardle, D M Roberton

  • 1Child Health Research Institute, Women's and Children's Hospital, South Australia, Australia.

Human Immunology
|December 22, 1999
PubMed

Insights

Neonatal T cells show higher CD28 and lower surface CD152 expression than adults. This immune cell profile may enhance neonatal T cell activation, crucial for early immune responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Neonatal Research

Background:

  • Immune system development in neonates differs from adults.
  • Costimulatory molecules CD80, CD86, CD28, and CD152 play critical roles in T cell activation.
  • Understanding neonatal immune responses is vital for infant health.

Purpose of the Study:

  • To compare the expression of CD80, CD86, CD28, and CD152 on lymphocytes from adults, neonates, and young children.
  • To investigate potential differences in immune cell signaling pathways between age groups.

Main Methods:

  • Flow cytometry was used to analyze peripheral blood lymphocytes.
  • Cells were isolated from adults, neonates (cord blood), and young children (2-20 months).
  • Lymphocytes were stimulated with PMA/ionomycin or anti-CD3 to assess molecule expression.

Main Results:

  • No significant differences in CD80 or CD86 expression on B cells between adults and neonates.
  • Neonates and young children had higher percentages of resting T cells expressing CD28 compared to adults.
  • Neonatal T cells showed greater CD28 intensity and lower surface CD152 expression upon stimulation.
  • Intracellular CD152 levels were similar, suggesting differential surface trafficking in neonates.

Conclusions:

  • Neonatal T cells exhibit a distinct expression pattern of CD28 and CD152 compared to adults.
  • Higher CD28 and lower surface CD152 on neonatal T cells may facilitate enhanced T cell activation.
  • These findings suggest specialized immune regulation in neonates to promote T cell responses.

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