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Perspectives on fetal derived CD5+ B1 B cells.

Richard R Hardy1, Kyoko Hayakawa1

  • 1Fox Chase Cancer Center, Philadelphia, PA, USA.

European Journal of Immunology
|September 5, 2015
PubMed
Summary

Fetal and adult B-cell development differs, with fetal cells producing CD5(+) B cells linked to self-reactivity and potential lymphoma risk. This developmental switch involves Lin28b and Let-7 regulation.

Keywords:
B-cell developmentB-cell leukemiaB1a cellsCD5+ B cellsStem cellsTransgenic mouse models

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Area of Science:

  • Immunology
  • Developmental Biology
  • Hematopoiesis

Background:

  • The origin of CD5(+) B cells and their link to lymphoma are significant research questions.
  • Fetal and adult bone marrow Pro-B cells generate distinct B cell phenotypes, suggesting a developmental switch in B lymphopoiesis.

Purpose of the Study:

  • To investigate the regulatory mechanisms underlying the developmental switch in B lymphopoiesis.
  • To explore the role of the Lin28b/Let-7 axis and Arid3a in fetal-type B cell development.
  • To examine the implications of CD5(+) B cells in immune responses and disease, particularly lymphoma.

Main Methods:

  • Comparative analysis of mRNA and miRNA expression in fetal and adult Pro-B cells.
  • Transfer of fetal and adult liver bone marrow Pro-B cells to generate distinct B cell populations.
  • Investigation of transcription factor Arid3a's role in fetal-type B cell development.

Main Results:

  • Differential expression of Lin28b mRNA and Let-7 miRNA was observed between fetal and adult Pro-B cells, implicating this axis in the developmental switch.
  • Fetal-type B cell development, promoted by Lin28b, generates CD5(+) B cells associated with positively selected self-reactivity.
  • Differential Lin28b expression in human B-cell precursors suggests a conserved developmental pathway similar to mice, potentially generating self-reactive "innate-like" B cells early in life.

Conclusions:

  • The Lin28b/Let-7 regulatory axis and Arid3a are key mediators of the developmental switch in B lymphopoiesis, influencing CD5(+) B cell generation.
  • CD5(+) B cells, while important for immune functions like clearing apoptotic cells, carry an increased risk of progression to leukemia/lymphoma.
  • Further research is needed to determine if early-life generated human CD5(+) B cells exhibit a higher propensity for leukemic transformation.