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Related Experiment Videos

Side-population cells from different precursor compartments.

Yalin Guo1, Marie Follo, Klaus Geiger

  • 1University of Freiburg Medical Center, Department of Hematology/Oncology, D-79106 Freiburg, Germany.

Journal of Hematotherapy & Stem Cell Research
|March 29, 2003
PubMed
Summary
This summary is machine-generated.

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Rare side population (SP) cells, identified by Hoechst 33342 dye efflux, possess stem cell potential. Human SP cells from apheresis products, cord blood, and bone marrow are mostly CD34-negative and show increased colony-forming units after culture.

Area of Science:

  • Hematology
  • Stem Cell Biology
  • Cell Biology

Background:

  • Side population (SP) cells, characterized by rapid Hoechst 33342 dye efflux, are known for their stem cell properties and ability to reconstitute bone marrow.
  • Previous studies have focused on murine SP cells, with limited characterization of human SP cells from various sources like mobilized peripheral blood (apheresis products, AP), cord blood (CB), and bone marrow (BM).

Purpose of the Study:

  • To analyze and characterize side population (SP) cells from different human hematopoietic cell sources.
  • To evaluate the stem cell potential, including colony-forming capacity and long-term culture-initiating cell (LTC-IC) activity, of human SP cells.

Main Methods:

  • Utilized Hoechst 33342 staining to identify and isolate side population (SP) cells from human AP, CB, and BM.

Related Experiment Videos

  • Assessed the frequency of SP cells and their colony-forming unit (CFU) potential before and after cytokine-supported suspension culture.
  • Quantified long-term culture-initiating cell (LTC-IC) activity in SP cells compared to non-SP cells.

    • Main Results:

    • Murine SP cells showed a median frequency of 0.04% with a 52-fold increase in CFU. Human SP cells occurred at a median frequency of 0.02%, with the highest numbers found in AP.
    • Human SP cells were predominantly CD34-negative and lineage marker-negative. While initial CFU were not enriched, a significant increase was observed after 5-7 days of culture.
    • SP cells demonstrated a substantial 167-fold increase in LTC-IC activity compared to non-SP cells, particularly from AP specimens.

    Conclusions:

    • Human primitive hematopoietic cells can be effectively isolated using Hoechst 33342 staining to identify SP cells.
    • SP cells from different human sources exhibit distinct characteristics, representing a rare CD34-negative population with significant stem cell potential.
    • Culturing enhances the functional stem cell capacity of human SP cells, highlighting their therapeutic relevance.