title: beta1-Integrins dominate cell traffic of leukemic cells in human bone-marrow stroma.
abstract: Migration patterns of leukemic cells in bone marrow are largely regulated by cell contacts between leukemic cells and stromal cells or extra-cellular matrix. The mechanism of this interaction with bone-marrow stromal cells was studied in a human in vitro model. Migration behavior of erythroleukemia cell line K562, derived from a patient with chronic myeloid leukemia, was compared with that of the erythroleukemia cell line HEL92.1.7 and the promyelocytic leukemia cell line HL60 from acute leukemias. Interaction varied between low binding affinity (K562) to intensive cell interaction (HEL92.1.7) followed by invasion into the stromal cell monolayer. Some of the HL60 cells adhered to stromal cells, while the remainder migrated into the stromal cell monolayer. The role of adhesion molecules in these cell interactions was determined. Distinct expression of beta1-integrins ICAM-1, CD44 and VCAM-1 was detected on the different cell lines. Inhibition studies pointed to a dominant role of VLA-4- and VLA-5-mediated interactions. K562 lacked VLA-4 and a low binding affinity of the VLA-5 on these cells resulted in an absence of binding to the bone-marrow stroma. These results indicate the VLA-5/fibronectin, VLA-4/fibronectin and the VLA-4/VCAM-1 interaction pathways between leukemic cells and bone-marrow stroma.
authors.affiliation: Department of Pathology, University Hospital, Utrecht, The Netherlands.
authors.forename: D
authors.initials: D
authors.lastname: Van der Velde-Zimmerman
authors.forename: A J
authors.initials: AJ
authors.lastname: Smits
authors.forename: M A
authors.initials: MA
authors.lastname: Verdaasdonk
authors.forename: L H
authors.initials: LH
authors.lastname: Rademakers
authors.forename: N
authors.initials: N
authors.lastname: Werner
authors.forename: D C
authors.initials: DC
authors.lastname: Spierings
authors.forename: R A
authors.initials: RA
authors.lastname: De Weger
authors.forename: J G
authors.initials: JG
authors.lastname: Van den Tweel
authors.forename: P
authors.initials: P
authors.lastname: Joling
mesh_terms: D001853:Bone Marrow / Q000473:pathology*; D002448:Cell Adhesion; D015815:Cell Adhesion Molecules / Q000032:analysis; D002465:Cell Movement; D006801:Humans; D019012:Integrin beta1 / Q000502:physiology*; D007938:Leukemia / Q000473:pathology*; D017469:Receptors, Fibronectin / Q000502:physiology; D017154:Stromal Cells / Q000473:pathology; D014407:Tumor Cells, Cultured
chemical_list: D015815:Cell Adhesion Molecules; D019012:Integrin beta1; D017469:Receptors, Fibronectin