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Related Experiment Videos

Phenotype and function of hematopoietic stem cells.

S J Sharkis1, S Neutzel, M I Collector

  • 1Experimental Hematopoiesis Program, Johns Hopkins Oncology Center, Baltimore, Maryland 21231, USA. ssharkis@jhmi.edu

Annals of the New York Academy of Sciences
|July 19, 2001
PubMed
Summary

Researchers identified single cells capable of long-term hematopoietic repopulating ability (LTRA) in mice. These cells self-renew and acquire a CD34 phenotype, crucial for bone marrow reconstitution.

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Area of Science:

  • Hematology
  • Stem Cell Biology
  • Immunology

Background:

  • Hematopoietic stem cells (HSCs) are essential for lifelong blood cell production.
  • Identifying and isolating HSCs with long-term repopulating ability (LTRA) is critical for transplantation and regenerative medicine.
  • Current methods for HSC isolation are often indirect or lack definitive functional validation.

Purpose of the Study:

  • To develop an in vivo selection technique for isolating individual HSCs with LTRA.
  • To characterize the phenotype and self-renewal capacity of these isolated cells.
  • To demonstrate the potential of single-cell transplantation for hematopoietic system reconstitution.

Main Methods:

  • Utilized an in vivo selection strategy in lethally irradiated murine recipients.

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  • Transplanted limiting numbers of cells, including single cells, to assess repopulation capacity.
  • Performed serial transplantation experiments to evaluate long-term self-renewal of engrafted cells.
  • Analyzed cell surface phenotype, including CD34 expression, in engrafted animals.

    • Main Results:

    • Successfully isolated individual cells capable of repopulating the murine hematopoietic system.
    • Observed rapid acquisition of a CD34 phenotype by these repopulating cells in vivo.
    • Confirmed that progenitors in long-term chimeras were of donor origin.
    • Demonstrated self-renewal of LTRA cells through serial transplantation over an extended period (11 months post-transplant, followed by 4 months in new hosts).

    Conclusions:

    • An in vivo selection method can effectively isolate single HSCs with LTRA.
    • LTRA cells possess the capacity for self-renewal, essential for sustained hematopoiesis.
    • CD34 expression is a key phenotype associated with functional HSCs in this model.
    • Single-cell transplantation holds promise for understanding and potentially manipulating hematopoietic stem cell biology.