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 Blood, 1 August 2008, Vol. 112, No. 3, pp. 840-843.
Prepublished online as a Blood First Edition Paper on June 2, 2008; DOI 10.1182/blood-2008-03-144576.

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NEOPLASIA

Brief Report

No convincing evidence for a role of CD31-CD38 interactions in the pathogenesis of chronic lymphocytic leukemia

Sanne H. Tonino1, Rene Spijker2, Dieuwertje M.P. Luijks2, Marinus H. J. van Oers1, and Arnon P. Kater1

1 Department of Hematology and 2 Department of Experimental Immunology, Academic Medical Center, Amsterdam, The Netherlands

Although CD38, a marker of poor prognosis in chronic lymphocytic leukemia (CLL), is known primarily as an ecto-enzyme, it has also been ascribed a receptor function. Interaction with its proposed ligand CD31 expressed on nurse-like cells would result in proliferative and survival-signals. Yet, in CLL, both homotypic and heterotypic CD31-CD38 interactions are expected to be rather ubiquitous. We analyzed whether CD38-CD31 interactions result in proliferative and antiapoptotic signals. We found a high expression of CD31 on CLL, irrespective of CD38 expression. Coculture of CD38high CLL with endothelial cells or CD31 transfected fibroblasts, with or without blocking CD31 or CD38 antibodies, did not result in increased survival or proliferation. Analysis of gene expression of most known regulators of apoptosis revealed no influence of coculture with CD31-expressing feeder cells. In conclusion, our data do not support an important contribution of CD38 triggering by CD31 to the proliferative and antiapoptotic state of the leukemic clone.


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