Abstract:
:We show the molecular and functional characterization of a novel population of lineage-negative CD34-negative (Lin(-)CD34(-)) hematopoietic stem cells from chronic myelogenous leukemia (CML) patients at diagnosis. Molecular karyotyping and quantitative analysis of BCR-ABL transcript demonstrated that approximately one-third of CD34(-) cells are leukemic. CML Lin(-)CD34(-) cells showed kinetic quiescence and limited clonogenic capacity. However, stroma-dependent cultures induced CD34 expression on some cells and cell cycling, and increased clonogenic activity and expression of BCR-ABL transcript. Lin(-)CD34(-) cells showed hematopoietic cell engraftment rate in 2 immunodeficient mouse strains similar to Lin-CD34(+) cells, whereas endothelial cell engraftment was significantly higher. Gene expression profiling revealed the down-regulation of cell-cycle arrest genes and genes involved in antigen presentation and processing, while the expression of genes related to tumor progression, such as angiogenic factors, was strongly up-regulated compared with normal counterparts. Phenotypic analysis confirmed the significant down-regulation of HLA class I and II molecules in CML Lin(-)CD34(-) cells. Imatinib mesylate did not reduce fusion transcript levels, BCR-ABL kinase activity, and clonogenic efficiency of CML Lin(-)CD34(-) cells in vitro. Moreover, leukemic CD34(-) cells survived exposure to BCR-ABL inhibitors in vivo. Thus, we identified a novel CD34(-) leukemic stem cell subset in CML with peculiar molecular and functional characteristics.
journal_name
Bloodjournal_title
Bloodauthors
Lemoli RM,Salvestrini V,Bianchi E,Bertolini F,Fogli M,Amabile M,Tafuri A,Salati S,Zini R,Testoni N,Rabascio C,Rossi L,Martin-Padura I,Castagnetti F,Marighetti P,Martinelli G,Baccarani M,Ferrari S,Manfredini Rdoi
10.1182/blood-2008-08-176016subject
Has Abstractpub_date
2009-12-10 00:00:00pages
5191-200issue
25eissn
0006-4971issn
1528-0020pii
blood-2008-08-176016journal_volume
114pub_type
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