Activation-dependent alpha5beta1 integrin-mediated adhesion to fibronectin decreases proliferation of chronic myelogenous leukemia progenitors and K562 cells.

Abstract:

:Chronic myelogenous leukemia (CML) is a malignant disease of the hematopoietic stem cell characterized by abnormal circulation and proliferation of malignant progenitors. In contrast to their normal counterparts, CML progenitors adhere poorly to bone marrow stroma or fibronectin (FN). Aside from anchoring progenitors in the marrow microenvironment, beta1 integrin-dependent adhesion of normal progenitors is also associated with inhibition of their proliferation. As the beta1 integrin expression on CML progenitors is normal, we hypothesized that decreased integrin affinity may underlie the abnormal adhesive and proliferative characteristics of CML progenitors. We examined the effect of affinity modulation by the activating antibody 8A2 on the adhesion and proliferation of CML progenitors and the CML cell line, K562. 8A2 induced alpha5Beta1-dependent adhesion of Philadelphia chromosome-positive (Ph+) CD34+/HLA-DR+ cells and K562 cells to FN. Increased adhesion was 8A2- and FN concentration-dependent, time-dependent, and energy-dependent. Further, 8A2-induced adhesion to FN significantly inhibited the proliferation of malignant CML progenitors as well as K562 cells independent of cell differentiation, necrosis, or apoptosis. These studies demonstrate that affinity modulation of the alpha5Beta1 integrin on CML progenitors and K562 cells by 8A2 results in increased adhesion to FN with subsequent decreased proliferation, suggesting that decreased beta1 integrin affinity contributes to the abnormal circulation and proliferation of malignant progenitors in CML.

journal_name

Blood

journal_title

Blood

authors

Lundell BI,McCarthy JB,Kovach NL,Verfaillie CM

subject

Has Abstract

pub_date

1996-03-15 00:00:00

pages

2450-8

issue

6

eissn

0006-4971

issn

1528-0020

journal_volume

87

pub_type

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