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Prepublished online as a Blood First Edition Paper on July 17, 2003; DOI 10.1182/blood-2002-11-3462.

Submitted November 14, 2002
Accepted June 30, 2003
JAML, a novel protein with characteristics of a Junctional Adhesion Molecule, is induced during differentiation of myeloid leukemia cells
Christel Moog-Lutz, Florence Cave-Riant, Florence C Guibal, Marie A Breau, Yolande Di Gioia, Pierre O Couraud, Yvon E Cayre, Sandrine Bourdoulous, and Pierre G Lutz*
Unite 417, INSERM, Hopital Robert Debre, Paris, France
Institut Cochin, Unite 567, INSERM, CNRS UMR8104, Universite Paris V, Paris, France
* Corresponding author; email: lutz{at}rdebre.inserm.fr.
Retinoic acid induces clinical remission in acute promyelocytic leukemia (APL) by triggering differentiation of leukemia promyelocytes. Here, we have characterized a gene encoding a member of the immunoglobulin superfamily, among novel retinoic acid-induced genes identified in APL cells. This protein, which was named JAML (Junctional Adhesion Molecule-Like), contains two extracellular immunoglobulin-like domains, a transmembrane segment, and a cytoplasmic tail. JAML mRNA is expressed in hematopoietic tissues and is prominently expressed in granulocytes. The fact that JAML protein is localized at the cell plasma membrane in the areas of cell-cell contacts while it is not detected at free cell borders suggests that JAML is engaged in homophilic interactions. Furthermore, a conserved dimerization motif among JAM members was shown to be important for JAML localization at the cell membrane. Finally, exogenous expression of JAML in myeloid leukemia cells resulted in enhanced cell adhesion to endothelial cells. Altogether, our results point to JAML as a novel member of the JAM family expressed on leukocytes with a possible role in leukocyte transmigration.

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