Stem Cells
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Stem Cells Vol. 23 No. 6 June 2005, pp. 752 -760
doi:10.1634/stemcells.2004-0292; www.StemCells.com
© 2005 AlphaMed Press

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Characterization of Cells with a High Aldehyde Dehydrogenase Activity from Cord Blood and Acute Myeloid Leukemia Samples

Daniel J. Pearcea, David Taussiga,c, Catherine Simpsonb, Kirsty Allenb, Ama Z. Rohatinerc, T. Andrew Listerc, Dominique Bonneta

a Hematopoietic Stem Cell Laboratory,
b FACS Laboratory, London Research Institute, Cancer Research UK, London, United Kingdom;
c Cancer Research UK Department of Medical Oncology, St. Bartholomew’s Hospital, West Smithfield, London, United Kingdom

Key Words. Human CD34+ cells • Acute myelogenous leukemia • Selection technologies • NOD/SCID model

Correspondence: Dominique Bonnet, Ph.D., Hematopoietic Stem Cell Laboratory, Cancer Research UK, London Research Institute, 44 Lincoln’s Inn Fields, London WC2A 3PX, United Kingdom. Telephone: 020-726-93281; Fax: 020-726-93581; e-mail: dominique.bonnet{at}cancer.org.uk

Aldehyde dehydrogenase (ALDH) is a cytosolic enzyme that is responsible for the oxidation of intracellular aldehydes. Elevated levels of ALDH have been demonstrated in murine and human progenitor cells compared with other hematopoietic cells, and this is thought to be important in chemoresistance. A method for the assessment of ALDH activity in viable cells recently has been developed and made commercially available in a kit format. In this study, we confirmed the use of the ALDH substrate kit to identify cord blood stem/progenitor cells. Via multicolor flow cytometry of cord blood ALDH+ cells, we have expanded on their phenotypic analysis. We then assessed the incidence, morphology, phenotype, and nonobese diabetic/ severe combined immunodeficiency engraftment ability of ALDH+ cells from acute myeloid leukemia (AML) samples. AML samples had no ALDH+ cells at all, an extremely rare nonmalignant stem/progenitor cell population, or a less rare, leukemic stem cell population. Hence, in addition to identifying nonmalignant stem cells within some AML samples, a high ALDH activity also identifies some patients’ CD34+/ CD38– leukemic stem cells. The incidence of normal or leukemic stem cells with an extremely high ALDH activity may have important implications for resistance to chemotherapy. Identification and isolation of leukemic cells on the basis of ALDH activity provides a tool for their isolation and further analysis.




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