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A developmental switch in B lymphopoiesis.

R R Hardy1, K Hayakawa

  • 1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, PA 19111.

Proceedings of the National Academy of Sciences of the United States of America
|December 15, 1991
PubMed
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A developmental switch occurs in B lymphopoiesis, with fetal pro-B cells generating distinct B-cell progeny compared to adult pro-B cells. This indicates different B-cell differentiation pathways during fetal and adult development.

Area of Science:

  • Immunology
  • Developmental Biology
  • Hematopoiesis

Background:

  • B and T lymphocytes originate from hematopoietic stem cells in both fetal and adult life.
  • A key question is whether B-lymphopoiesis differentiation pathways are conserved or distinct between fetal and adult stages.

Purpose of the Study:

  • To investigate if fetal and adult B-lymphopoiesis pathways differ.
  • To compare the B-cell progeny derived from fetal versus adult pro-B cells.

Main Methods:

  • Isolation of fetal liver and adult bone marrow pro-B cells.
  • In vitro and in vivo generation of B-cell progeny.
  • Flow cytometry analysis of cell surface markers (CD5, IgD).

Main Results:

Related Experiment Videos

  • Fetal pro-B cells predominantly generated CD5+ B cells, while adult pro-B cells yielded CD5- B cells.
  • Fetal-derived B cells expressed low IgD levels, unlike adult-derived B cells which showed high IgD expression comparable to splenic B cells.
  • Severe combined immunodeficiency (SCID) mice were used for in vivo differentiation studies.

    • Conclusions:

    • Fetal liver pro-B cells commit to a distinct B-cell differentiation pathway compared to adult bone marrow pro-B cells.
    • A developmental switch in B-lymphopoiesis is evident, with early fetal progenitors generating phenotypically distinct progeny.