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Related Experiment Videos

Expression and function of CD2 during murine thymocyte ontogeny.

H Yagita1, J Asakawa, S Tansyo

  • 1Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.

European Journal of Immunology
|December 1, 1989
PubMed
Summary

CD2 molecule expression is not essential for early T cell development in mice. Studies show CD2 is not required for CD25 induction or the development of mature T cells in the thymus.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • CD2, a receptor on human T cells, is thought to play a role in early T cell development.
  • Understanding the function of CD2 during T cell ontogeny is crucial for comprehending immune system development.

Purpose of the Study:

  • To investigate the expression and functional significance of CD2 during murine thymocyte development.
  • To determine if CD2 expression is a prerequisite for CD25 induction and T cell maturation in mice.

Main Methods:

  • Utilized monoclonal antibodies to detect and analyze murine CD2 expression on thymocytes.
  • Employed fetal thymus organ culture to assess the impact of anti-murine CD2 antibody on T cell development.
  • Characterized thymocyte populations based on surface markers including CD2, CD25, CD4, CD8, and CD3.

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Main Results:

  • CD2 expression was first detected on fetal thymocytes at day 14 and increased during development.
  • CD25 expression was observed on CD2- cells prior to CD2 appearance, and CD2 and CD25 expression were mutually exclusive in adult CD4-CD8- thymocytes.
  • Inhibition of CD2 expression via antibody treatment did not affect CD25 induction or the development of mature CD3+ thymocytes.

Conclusions:

  • Surface CD2 expression is not a prerequisite for CD25 induction during murine thymocyte ontogeny.
  • These findings suggest that CD2 expression may not be functionally relevant during early T cell development in mice, contrary to observations in humans.
  • A significant population of CD3+CD2- thymocytes exists in both fetal and adult mice, further supporting the non-essential role of CD2 in early T cell development.