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CD38/CD31 Interactions Activate Genetic Pathways Leading to Proliferation and Migration in Chronic Lymphocytic Leukemia Cells

Overview
Journal Mol Med
Publisher Biomed Central
Date 2009 Dec 4
PMID 19956559
Citations 38
Authors
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Abstract

Human CD38 is a pleiotropic glycoprotein belonging to a family of enzymes/receptors involved in the catabolism of extracellular nucleotides. CD38-receptor activities are regulated through binding to the nonsubstrate ligand CD31. CD38 expression above a critical threshold is a negative prognostic marker for chronic lymphocytic leukemia (CLL) patients. Activation of CD38 by means of agonistic monoclonal antibodies or the CD31 ligand induces proliferation and immunoblast differentiation of CLL cells. Here we define the genetic signature that follows long-term in vitro interactions between CD38(+) CLL lymphocytes and CD31(+) cells. The emerging profile confirms that the CD31/CD38 axis activates genetic programs relevant for proliferative responses. It also indicates a contribution of this pathway to the processes mediating migration and homing. These results further support the notion that the CD31/CD38 axis is part of a network of accessory signals that modify the microenvironment, favoring localization of leukemic cells to growth-permissive sites.

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