Hoechst 33342 efflux identifies a subpopulation of cytogenetically normal CD34(+)CD38(-) progenitor cells from patients with acute myeloid leukemia.
Efflux of Hoechst 33342 from normal hematopoietic cells identifies a "side population" (SP(+)) of negatively staining cells that, in the mouse, are largely CD34(-) and are enriched for primitive progenitors. To further characterize human SP(+) cells, blood or bone marrow from 16 patients with acute myeloid leukemia (AML) was analyzed for their presence, immunophenotype, and cytogenetic and functional properties, and for the relation between SP phenotype and multidrug resistance-1 (MDR-1) expression. The mean percentages of SP(+) and MDR(+) cells was 8.1% (range, 0.5%-29.9%) and 12.8% (range, 0%-54.8%), respectively, with no correlation between the 2 values. The percentages of SP(+) cells that were CD34(+)CD38(-), CD34(+)CD38(+), or CD34(-) were 12% (range, 0.4%-50%), 25% (range, 0.5%-96%), and 63% (range, 4%-99%). Cytogenetically abnormal cells were always detected in the SP(-)CD34(+)CD38(-) and SP(+)CD34(-) fractions, and abnormal colonies (CFC), long-term culture-initiating cells (LTC-IC), and nonobese diabetic-severe combined immunodeficiency (NOD/SCID) mouse leukemia-IC were detected in the former fraction. No progenitors were detected among SP(+)CD34(-) cells in any of these assays from 9 of 10 samples. In contrast, exclusively normal cells were detected in the SP(+)CD34(+)CD38(-) fraction from 9 of 15 samples, and CFC, LTC-IC, and multilineage engraftment in NOD/SCID mice from this subpopulation were also cytogenetically normal in 6 of 8, 6 of 7, and 2 of 2 cases studied, respectively. In contrast to murine studies, primitive progenitors are enriched among SP(+)CD34(+)CD38(-) cells from patients with AML. The molecular basis for Hoechst dye efflux is uncertain because it does not appear to be related to MDR-1 expression. (Blood. 2001;97:3882-3889)
Feuring-Buske
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Terry Fox Laboratory, British Columbia Cancer Agency, 610 West 10th Ave., Vancouver, British Columbia, Canada V5Z 1L3.
Hogge
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D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism; D000208:Acute Disease; D000328:Adult; D000368:Aged; D000818:Animals; D015703:Antigens, CD; D018952:Antigens, CD34 / Q000032:analysis*; D000943:Antigens, Differentiation / Q000032:analysis*; D001562:Benzimidazoles; D001773:Blood Cells / Q000166:cytology; D001854:Bone Marrow Cells / Q000166:cytology; D018929:Cell Culture Techniques; D002999:Clone Cells / Q000276:immunology / Q000637:transplantation; D020732:Cytogenetic Analysis; D005260:Female; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000276:immunology*; D006801:Humans; D016130:Immunophenotyping; D007951:Leukemia, Myeloid / Q000473:pathology*; D007963:Leukocytes, Mononuclear / Q000166:cytology; D008297:Male; D008562:Membrane Glycoproteins; D051379:Mice; D016688:Mice, Inbred NOD; D008875:Middle Aged; D009244:NAD+ Nucleosidase / Q000032:analysis*; D014183:Transplantation, Heterologous
D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D001562:Benzimidazoles; D008562:Membrane Glycoproteins; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; C498155:Cd38 protein, mouse; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1; C017807:bisbenzimide ethoxide trihydrochloride