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Related Experiment Videos

CD34 expression on long-term repopulating hematopoietic stem cells changes during developmental stages.

S Matsuoka1, Y Ebihara, M Xu

  • 1Department of Clinical Oncology, Institute of Medical Science, University of Tokyo, Japan.

Blood
|January 12, 2001
PubMed
Summary

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Hematopoietic stem cells (HSC) expression of CD34 changes with age in mice. Neonatal HSC express CD34, but adult HSC are CD34-negative, impacting cell therapy applications.

Area of Science:

  • Hematology
  • Developmental Biology
  • Immunology

Background:

  • The CD34 antigen is a key marker for primitive hematopoietic stem cells (HSC) used in transplantation and gene therapy.
  • The precise role and expression pattern of CD34 on HSC throughout development remain incompletely understood.

Purpose of the Study:

  • To investigate developmental changes in CD34 expression on murine hematopoietic stem cells (HSC).
  • To determine if CD34 expression differentiates long-term repopulating HSC from other hematopoietic cells during murine development.

Main Methods:

  • Utilized competitive long-term reconstitution assays in mice.
  • Analyzed CD34 expression on HSC from fetal, neonatal, and adult mice across bone marrow, liver, and spleen.
  • Performed serial transplantation experiments to track HSC populations.

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Main Results:

  • Neonatal HSC (Lin(-)c-Kit(+)) express high levels of CD34, found in bone marrow, liver, and spleen.
  • Adult HSC (Lin(-)c-Kit(+)) are predominantly CD34-negative, with stem cell activity shifting to the CD34(-) fraction after 16 weeks.
  • Hematopoietic progenitor cells consistently express CD34 throughout murine development, unlike HSC.

Conclusions:

  • Murine HSC undergo a developmental shift from CD34 expression in neonates to CD34 negativity in adults.
  • Adult CD34-negative HSC are the progeny of neonatal CD34-expressing HSC.
  • These findings have implications for optimizing HSC and umbilical cord blood HSC applications in clinical settings.