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Lymphocyte development from stem cells.

K Ikuta1, N Uchida, J Friedman

  • 1Howard Hughes Medical Institute, Standord University School of Medicine, California 94305.

Annual Review of Immunology
|January 1, 1992
PubMed
Summary
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Hematopoietic stem cells (HSCs) possess a developmental clock influencing gene expression and T-cell differentiation. Fetal HSCs, unlike adult HSCs, can generate specific T cells within the fetal thymus.

Area of Science:

  • Immunology
  • Developmental Biology
  • Hematopoiesis

Background:

  • Hematopoietic stem cells (HSCs) are crucial for blood cell formation.
  • T-cell development involves distinct precursor stages within the thymus.
  • Ontogeny may impact HSC differentiation potential.

Purpose of the Study:

  • To investigate the developmental potential of fetal versus adult HSCs.
  • To explore the role of the thymic microenvironment in T-cell differentiation.
  • To understand the proposed developmental clock in HSCs.

Main Methods:

  • Isolation of highly enriched pluripotent and multipotent HSCs (Thy-1loLin-Sca-1+).
  • Analysis of T-cell precursor migration and differentiation stages (CD4lo precursors).
  • Comparison of differentiation capacity between fetal and adult HSCs.

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Main Results:

  • Fetal HSCs, but not adult HSCs, differentiate into V gamma 3+ and V gamma 4+ T cells in the fetal thymus.
  • A distinct CD4lo precursor stage in T-cell development was identified.
  • HSCs may exhibit a developmental clock regulating gene locus activation/closure.

Conclusions:

  • HSCs possess an intrinsic developmental clock that governs gene expression and differentiation potential.
  • Fetal HSCs have a unique capacity for T-cell receptor gamma chain expression in the fetal thymus.
  • Ontogenetic changes in HSCs lead to a loss of specific developmental pathways.