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Related Experiment Videos

Intrathymic lymphoid precursor cells during fetal thymus development

M Antica1, L Wu, K Shortman

  • 1Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia.

Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1993
PubMed
Summary

Researchers investigated early T cell development in mice. They found that "low CD4 precursors" present in embryonic thymuses lack the ability to reconstitute the thymus, questioning their role in T cell development.

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Characterization of thymus-seeding precursor cells from mouse bone marrow.

Blood·2001

Area of Science:

  • Immunology
  • Developmental Biology
  • Hematopoiesis

Background:

  • Previous studies identified "low CD4 precursors" in adult mouse thymus, capable of generating T and B lymphocytes.
  • These precursors are c-kit positive and precede the CD4-CD8- stage in T cell development.
  • The role of these precursors in early T cell ontogeny remained unclear.

Purpose of the Study:

  • To investigate the presence and function of low CD4 precursors during embryonic and neonatal T cell development.
  • To determine if these precursors are a necessary stage in T cell development during ontogeny.

Main Methods:

  • Analysis of embryonic and neonatal mouse thymuses.
  • Phenotypic characterization of precursor cell populations.
  • Functional assays to assess thymus-reconstituting ability.

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Main Results:

  • A population resembling adult low CD4 precursors was identified from embryonic day 15.
  • Expression of low CD4 levels was observed from embryonic day 17.
  • These embryonic precursors exhibited no thymus-reconstituting ability, and neonatal precursors showed very limited ability.

Conclusions:

  • The presence of low CD4 precursors during embryonic development does not guarantee thymus-reconstituting function.
  • These findings challenge the concept of the adult low CD4 precursor as an obligatory stage in T cell development.