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Related Experiment Videos

Who is hematopoietic stem cell: CD34+ or CD34-?

X Pei1

  • 1Department of Experimental Hematology, Beijing Institute of Radiation Medicine, People's Republic of China. peixt@nic.bmi.ac.cn

International Journal of Hematology
|January 22, 2000
PubMed
Summary

Hematopoietic stem cells (HSCs) can renew themselves and create blood cells. Some HSCs lack the CD34 marker, challenging current stem cell selection methods for transplantation.

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Immunology

Background:

  • Hematopoietic stem cells (HSCs) are multipotent, self-renewing cells responsible for producing all mature blood and immune cells.
  • The CD34 marker is traditionally used to identify and isolate human HSCs from bone marrow (BM) for clinical transplantation.
  • Previous studies using CD34+ enriched BM cells demonstrated their long-term reconstituting ability.

Purpose of the Study:

  • To investigate the presence and characteristics of HSCs that do not express the CD34 marker.
  • To evaluate the potential of CD34-negative progenitor cells in hematopoietic reconstitution.

Main Methods:

  • Engraftment studies in NOD/SCID mice, rhesus monkeys, and human/sheep competitive models.
  • In vitro progenitor assays to assess CD34+ cell production.
  • Analysis of stem cell populations based on CD34 and lineage-marker expression.

Main Results:

  • Evidence suggests a rare population of HSC progenitors exists that are CD34-negative.
  • These CD34-negative progenitors possess competitive long-term in vivo repopulating potential.
  • These progenitors are capable of producing CD34+ cells in vitro.

Conclusions:

  • The findings challenge the exclusive reliance on CD34 expression for identifying HSCs.
  • A subset of potent HSCs may exist within the CD34-negative fraction of bone marrow cells.
  • This discovery has implications for refining stem cell selection strategies for transplantation.

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