title: Detection of molecular targets on the surface of CD34+CD38- bone marrow cells in myelodysplastic syndromes.
abstract: Myelodysplastic syndrome (MDS) is a kind of clonal stem-cell disorder in which aberration within a hematopoietic stem cell (HSC) gives rise to the entire disease as in acute myeloid leukemia (AML). Studies have showed that contrasting normal stem cells, AML stem cells express CD96 and CD123, but lack of CD90, although both of them reside within the CD34(+)CD38(-) population. So far, little is known about expression of the markers on MDS HSC. In this study, we analyzed the immunophenotypic characteristics of CD34(+)CD38(-) bone marrow (BM) cells by multicolor flow cytometry in 38 patients with MDS and 10 control patients. We found that CD34(+)CD38(-) BM cells coexpressed CD13, CD33, CD117, CD133, and HLA-DR almost in all patients, but in MDS they expressed higher amounts of CD13 (79% +/- 16% vs. 36% +/- 13%, P < 0.05) and CD133 (66% +/- 20% vs. 25% +/- 13%, P < 0.05). CD90 was expressed in all control patients but just in 63% of patients with MDS. No control patients had an expression of CD2, CD5, CD7, CD44, CD96, and CD123, which expressed variable amounts in 17-53% of patients with MDS. The level of CD13 in RCMD (89% +/- 7%), RAEB-1 (88% +/- 11%), and RAEB-2 (81% +/- 13%) were obviously higher than that of RA (63% +/- 16%, P < 0.05). CD2, CD5, and CD7 were more frequently observed in RAEB or INT and HIGH-R cases. Taken together, we demonstrate MDS stem cells display deranged phenotypic abnormalities that may make them particularly difficult to eradicate using therapies targeted against surface antigens, and the percentage of cells expressing CD13 is notably higher in patients with high-grade MDS that may be a potential prognostic indicator of MDS in the future.
authors.affiliation: Center for Stem Cell Research and Application, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xie
authors.forename: Xuhua
authors.initials: X
authors.lastname: Wang
authors.forename: Wen
authors.initials: W
authors.lastname: Du
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Qin
authors.forename: Shiang
authors.initials: S
authors.lastname: Huang
mesh_terms: D000071916:AC133 Antigen; D051997:ADP-ribosyl Cyclase 1 / Q000032:analysis*; D000293:Adolescent; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000032:analysis; D018952:Antigens, CD34 / Q000032:analysis*; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D001854:Bone Marrow Cells / Q000276:immunology*; D018826:CD13 Antigens / Q000032:analysis; D005260:Female; D005434:Flow Cytometry / Q000379:methods*; D006023:Glycoproteins / Q000032:analysis; D006684:HLA-DR Antigens / Q000032:analysis; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009190:Myelodysplastic Syndromes / Q000175:diagnosis* / Q000276:immunology; D010455:Peptides / Q000032:analysis; D011379:Prognosis; D019009:Proto-Oncogene Proteins c-kit / Q000032:analysis; D063268:Sialic Acid Binding Ig-like Lectin 3; D013194:Staining and Labeling / Q000379:methods; D018800:Thy-1 Antigens / Q000032:analysis; D055815:Young Adult
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D015214:Antigens, Differentiation, Myelomonocytic; C571163:CD33 protein, human; D006023:Glycoproteins; D006684:HLA-DR Antigens; C000606023:PROM1 protein, human; D010455:Peptides; D063268:Sialic Acid Binding Ig-like Lectin 3; D018800:Thy-1 Antigens; D019009:Proto-Oncogene Proteins c-kit; D051997:ADP-ribosyl Cyclase 1; D018826:CD13 Antigens