CD34+ acute myeloid and lymphoid leukemic blasts can be induced to differentiate into dendritic cells

• Published in: Blood 1999-09, Vol.94 (6), p.2048-2055
• Main Authors: CIGNETTI, A, BRYANT, E, ALLIONE, B, VITALE, A, FOA, R, CHEEVER, M. A
• Format: Article
• Language: English
• Subjects: Antigens, CD - blood; Antigens, CD34 - blood; Biological and medical sciences; Cell Differentiation; Cells, Cultured; Chromosomes, Human, Pair 7; Dendritic Cells - immunology; Dendritic Cells - pathology; Flow Cytometry; Genotype; Hematologic and hematopoietic diseases; Hematopoietic Stem Cells - immunology; Hematopoietic Stem Cells - pathology; Humans; Immunophenotyping; Leukemia, Myeloid, Acute - blood; Leukemia, Myeloid, Acute - genetics; Leukemia, Myeloid, Acute - immunology; Leukemia, Myeloid, Acute - pathology; Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis; Medical sciences; Monosomy; Precursor Cell Lymphoblastic Leukemia-Lymphoma - blood; Precursor Cell Lymphoblastic Leukemia-Lymphoma - immunology; Precursor Cell Lymphoblastic Leukemia-Lymphoma - pathology; Time Factors
• ISSN: 0006-4971; 1528-0020
• DOI: 10.1182/blood.V94.6.2048

CD34(+) hematopoietic stem cells from normal individuals and from patients with chronic myelogenous leukemia can be induced to differentiate into dendritic cells (DC). The aim of the current study was to determine whether acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL) cells could be induced to differentiate into DC. CD34(+) AML-M2 cells with chromosome 7 monosomy were cultured in the presence of granulocyte-macrophage colony-stimulating factor (GM-CSF), tumor necrosis factor alpha (TNFalpha), and interleukin-4 (IL-4). After 3 weeks of culture, 35% of the AML-M2 cells showed DC morphology and phenotype. The DC phenotype was defined as upmodulation of the costimulatory molecules CD80 and CD86 and the expression of CD1a or CD83. The leukemic nature of the DC was validated by detection of chromosome 7 monosomy in sorted DC populations by fluorescence in situ hybridization (FISH). CD34(+) leukemic cells from 2 B-ALL patients with the Philadelphia chromosome were similarly cultured, but in the presence of CD40-ligand and IL-4. After 4 days of culture, more than 58% of the ALL cells showed DC morphology and phenotype. The leukemic nature of the DC was validated by detection of the bcr-abl fusion gene in sorted DC populations by FISH. In functional studies, the leukemic DC were highly superior to the parental leukemic blasts for inducing allogeneic T-cell responses. Thus, CD34(+) AML and ALL cells can be induced to differentiate into leukemic DC with morphologic, phenotypic, and functional similarities to normal DC.