Expression of CD24 on CD19- CD79a+ early B-cell progenitors in human bone marrow.
CD24 is a surface marker expressed in immature and mature B cells and involved in cellular adhesion and apoptosis. There are no data, which delineate the stage in early development of human B cells, which marks the expression of CD24. We studied lymphopoiesis in normal pediatric bone marrow (BM) and found that 1.5+/-0.2% of WBC were CD24(+) lymphocytes which did not express CD19. A significant fraction of these cells expressed low levels of CD45 (CD19- CD24+ CD45low cells). Small numbers of CD19- CD24+ CD45low cells were found in the regenerating BM of children with acute lymphoblastic leukemia after the completion of chemotherapy and in normal adult BM. Flow cytometric analyses have shown that CD19- CD24+ CD45low lymphocytes express CD10, CD34, CD79a, CD179a (VpreB), and TdT markers, i.e., displayed antigenic properties of early B-cell progenitors. Our data indicate that CD19- early B-cell progenitors in human BM express CD24, and that the expression of CD24 in human B-cell development precedes the expression of CD19.
Israel
Elena
E
Flow Cytometry Unit, Soroka University Medical Center, Israel.
Kapelushnik
Joseph
J
Yermiahu
Tikva
T
Levi
Itai
I
Yaniv
Isaak
I
Shpilberg
Ofer
O
Shubinsky
George
G
D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D018941:Antigens, CD19 / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism*; D001854:Bone Marrow Cells / Q000276:immunology*; D051927:CD24 Antigen / Q000378:metabolism*; D051925:CD79 Antigens / Q000032:analysis; D002648:Child; D004253:DNA Nucleotidylexotransferase / Q000378:metabolism; D006801:Humans; D017493:Leukocyte Common Antigens / Q000032:analysis; D038041:Lymphopoiesis / Q000276:immunology; D013234:Stem Cells / Q000276:immunology / Q000378:metabolism*
D015703:Antigens, CD; D018941:Antigens, CD19; D051927:CD24 Antigen; D051925:CD79 Antigens; D004253:DNA Nucleotidylexotransferase; D017493:Leukocyte Common Antigens